AU763649B2 - Connective tissue growth factor - Google Patents

Description

AUSTRALIA

Patents Act 1990 University of South Florida

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT p 9 p.

Invention Title: Connective tissue growth factor The following statement is a full description of this invention including the best method of performing it known to us:- 1\ CONNECTIVE TISSUE GROWTH FACTOR This invention was made with Government support by grant no. GM 37223, awarded by the National Institutes of Health. The Government has certain rights in this invention.

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention relates generally to the field of growth factors and specifically to Connective Tissue Growth Factor (CTGF), a polynucleotide encoding this factor and methods of use for CTGF.

10 RELATED ART Growth factors are a class of secreted polypeptides that stimulate target cells to proliferate, differentiate and organize in developing tissues. The action of growth factors is dependent on their binding to specific receptors which stimulates a signalling event within the cell. Examples of some well-studied growth factors 15 include platelet-derived growth factor (PDGF), insulin-like growth factor (IGF-I), transforming growth factor beta (TGF-1), transforming growth factor alpha (TGF-a), epidermal growth factor (EGF), and fibroblast growth factor (FGF).

PDGF is a cationic, heat-stable protein found in the alpha-granules of circulating platelets and is known to be a mitogen and a chemotactic agent for connective tissue cells such as fibroblasts and smooth muscle cells. Because of the activities of this molecule, PDGF is believed to be a major factor involved in the normal healing of wounds and pathologically contributing to such diseases as atherosclerosis and fibrotic diseases. PDGF is a dimeric molecule consisting of an A chain and a B chain. The chains form heterodimers or homodimers and all combinations isolated to date are biologically active.

Studies on the role of various growth factors in tissue regeneration and repair have led to the discovery of PDGF-like proteins. These proteins share both immunological and biological activities with PDGF and can be blocked with antibodies specific to

PDGF.

These new growth factors may play a significant role in the normal development, growth, and repair of human tissue. Therapeutic agents derived from these molecules may be useful in augmenting normal or impaired growth processes involving connective tissues in certain clinical states, wound healing. When these growth factors are involved pathologically in diseases, therapeutic developments from these proteins may be used to control or ameliorate uncontrolled tissue growth.

The formation of new and regenerating tissue requires the coordinate regulation of various genes that produce both regulatory and structural molecules which participate in the process of cell growth and tissue organization. Transforming growth factor beta (TGF-) appears to be a central regulatory component of this process.

TGF- is released by platelets, macrophages and neutrophils which are present in the initial phases of the repair process. TGF- can act as a growth stimulatory factor for mesenchymal cells and as a growth inhibitory factor for endothelial and epithelial cells. The growth stimulatory action of TGF-p appears to be mediated via an indirect mechanism involving autocrine growth factors such as PDGF 8B or PDGF AA or connective tissue growth factor (CTGF).

Several members of the TGF- superfamily possess activities suggesting possible applications for the treatment of cell proliferative disorders, such as cancer. In particular, TGF- has been shown to be potent growth inhibitor for a variety of cell types (Massague, Cell 49:437, 1987), MIS has been shown to inhibit the growth of human endometrial carcinoma tumors in nude mice (Donahoe, et al., Ann. Surg.

194:472, 1981), and inhibin a has been shown to suppress the development of tumors both in the ovary and in the testis (Matzuk, et al., Nature, 360:313, 1992).

Many of the members of the TGF- family are,-also important mediators of tissue repair. TGF- has been shown to have marked effects on the formation cf collagen and causes of striking angiogenic response in the newborn mouse (Roberts. et al., Proc. Nat/. Acad. USA 83:4167, 1986). The bone morphogenic proteins (EMPs) can induce new bone growth and are effective for the treatment of fractures and other skeletal defects (Glowacki, et al, Lancet, 1:959, 1981; Ferguson, et al, Clin.

Orthoped. Relat. Res., 227:265, 1988; Johnson, et al, Clin. Orthoped. Relat. Res., 230:257, 1988).

The isolation of growth factors and the genes encoding them is important in the development of diagnostics and therapeutics for various connective tissue-related disorders. The present invention provides such an invention.

Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is solely for the purpose of providing a context for the present invention. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed in Australia before the priority date of each claim of this application.

SUMMARY OF THE INVENTION Various cell types produce and secrete PDGF and PDGF-related molecules. In an attempt to identify the type of PDGF dimers present in the growth media of cultured endothelial cells, a new growth factor was discovered. This previously unknown factor, termed Connective Tissue Growth Factor (CTGF), is related immunologically and biologically to PDGF, however it is the product of a distinct gene.

In a first aspect, the present invention provides a method of diagnosing a pathological state in a subject suspected of having a pathology selected from pulmonary fibrosis, kidney fibrosis, tumor formation or growth, or glaucoma, which is characterized by a cell proliferative disorder associated with connective tissue growth factor (CTGF), the method comprising; 25 obtaining a sample suspected of containing CTGF from the subject; determining the level of CTGF in the sample; and comparing the level of CTGF in the sample to the level of CTGF in a normal standard sample.

In a second aspect, the present invention provides a method of diagnosing a pathological state in a subject suspected of having pathology characterized by a cell proliferative disorder associated with regulation of connective tissue growth factor *(CTGF) gene expression from a transforming growth factor-P (TGF-3) regulatory element (TPRE), said TPRE comprising the nucleotide sequence 5'-GTGTCAAGGGGTC-3' (SEQ ID NO:8), comprising; 35 obtaining a sample suspected of containing a CTGF nucleic acid molecule from the subject; 4 determining the structure or level of expression of the CTGF nucleic acid molecule in the sample, wherein the structure or level of expression of the CTGF nucleic acid molecule is indicative of CTGF gene expression from the TpRE; and comparing the structure or level of expression of the CTGF nucleic acid molecule in the sample to the structure or level of expression of the CTGF nucleic acid molecule in a normal standard sample, wherein a difference in the structure of level of expression of the CTGF nucleic acid molecule in the sample as compared to the CTGF nucleic acid molecule in a normal standard sample is indicative of altered CTGF expression from the TpRE, thereby diagnosing a pathological state in the subject.

In a further aspect, the present invention provides a recombinant nucleic acid molecule, comprising a transforming growth factor (TGF-P) regulatory element (TpRE) operably linked to a polynucleotide, wherein said TpRE comprises the nucleotide sequence 5'-GTGTCAAGGGGTC-3' (SEQ TD NO: 8).

The present invention identifies a TGF-P responsive or regulatory element in the untranslated nucleotides of the CTGF gene (about -157 to -145). Based on the identification of this element, the invention now provides a method for identifying a composition which affects CTGF expression comprising incubating components comprising the composition and TGF-P regulatory element (TpRE), in the presence of a TGF-P factor which regulates TpRE, and measuring the effect of the composition on CTGF expression. Thus, the invention provides a means for drug discovery for treatment of fibrotic diseases.

Brief Description of the Drawings FIGURE 1 panel A shows the structural organisation of the CTGF gene. Exons are indicated by boxed regions, with solid areas in the gene corresponding to the open reading frame.

FIGURE 1 panel B shows a comparison of nucleotide sequences between CTGF promoter (nucleotides 1 to 840; SEQ ID NO: 1) and fisp-12 promoter (SEQ ID NO: 9).

Identical nucleotides are marked with asterisks. The TATA box and other consensus sequences are indicated and shaded. The site of transcriptional initiation is indicated at position number +1.

9 FIGURE 1C.1 1C.3 shows the complete nucleotide (SEQ ID NO:1) and deduced amino acid (SEQ ID NO:2) sequence for the CTGF structural gene and 5' and 3' untranslated sequences.

FIGURE 2 shows a Northern blot analysis. Panel shows prolonged induction of CTGF mRNA by short term TGF-P. Confluent cultures of human skin fibroblasts were incubated with DMEM-ITS containing 5 4tg/ml of Insulin, 5 4pg/ml of Transferrin and 5 ng/ml of Selenium for 24 hours prior to the addition of TGF-P. After the treatment with 10 ng/ml of TGF-P for 1 hour, cells were washed with PBS and incubated with DMEM-ITS for indicated time periods. Panel shows the effect of cycloheximide (CHX) on induction of CTGF mRNA. Lane A and H are non-treated control cells at 4 hours and 24 hours, respectively. Lane B, 4 hrs. Cycloheximide ptg/ml); Lane C, 4 hrs TGF-P present for 1 hour during hour 1 of 2 of cycloheximide exposure; a Lane E, same as B with RNA prepared 24 hours after addition of cycloheximide; Lane f, 24 hours TGF-p (10ug/ml); Lane G, same as D with RNA prepared 24 hours after addition of cycloheximide and 22 hours after removal of TGF-. Panel (C) shows the effect of protein synthesis inhibitors on induction of CTGF mRNA. Cells were treated with puromycin or anisomycin for 4 hours. TGF-p was added 1 hour after the addition of protein synthesis inhibitor and cells were incubated for 3 hours prior to isolation of total RNA. CTGF transcripts were analyzed by Northern blot as described in the EXAMPLES.

FIGURE 3 panel A shows deletion analysis of CTGF promoter-luciferase constructs.

10 Known consensus sequences are indicated. NIH/3T3 fibroblasts were transfected with the constructs and 10 ng/ml of TGF-p was added for activation of the cells and cell extracts were prepared 24 hours later. Relative induction is indicated as fold S: above non-induced control cells and normalized using the P-galactosidase activity from control plasmids that were cotransfected with the CTGF constructs. These 15 studies were repeated 6 times with similar results. Data represent the average of duplicate transfections with the indicated construct performed in a single set of experiments.

FIGURE 3 panel B shows TGF- response of an SV40 enhancerless promoter element-luciferase reporter construct containing the TGF-P region of the CTGF 20 promoter. The indicated regions of the CTGF promoter were cloned in both orientations upstream from an SV40 enhancerless promoter. Cells were treated with ng/ml of TGF-p for 24 hrs prior to assay for luciferase activity. These experiments were repeated 4 times with similar results. Data represents the average of duplicate transfections of the indicated construct from a single experimental set.

FIGURE 4 shows competitive gel shift assays to delineate TGF- response element in the -205 to -109 region of the CTGF promoter. A nucleotide fragment consisting of the region from -205 to -109 of the CTGF promoter was end labeled with 32 P and used in competitive gel shifts with the indicated oligonucleotides. The specific gel shifted band is indicated by the arrow. A diagram of the sequences used indicates the position of these corresponding to the NF-1 and TIE like elements. The numbered fragments in the diagram indicate the lane number in the competitive gel shift assay with the specific nucleotide sequence indicated above the lane 3, 205/-150). Unlabeled competitors were used at a 250 fold molar excess over the labeled fragment. Only oligonucleotides containing the region from -169 to -150 acted as specific competitors. Neither the NF-1 or TIE like regions competed in this assay.

FIGURE 5 shows a methylation interference assay of the -205 to -109 region of the CTGF promoter. FIGURE 5 panel A shows a sequence analysis of the region from -205 to -109. Sequence from -200 to -113 is shown. Lane G is the G sequence of the intact labeled probe, Lane S is the sequence of the shifted band and Lane F is the sequence of the non-shifted free probe from the same sample. The only region containing mission G residues is from positions -157 to -145.

10 FIGURE 5 panel B shows a sequence analysis of the region -159 to -142 using a smaller fragment of the promoter (-169 to 193). Lanes are the same as in A.

:Competed G residues in this sequence are indicated by arrows. Solid circles indicate G residues detected in analysis of complementary strand (data not shown). Symbols and are for orientation with sequence in A.

FIGURE 6 shows competitive gel shift titration.assay of oligonucleotides in the TPRE.

Overlapping and non-overlapping oligonucleotides containing portions of the -159 to -143 region of the CTGF promoter were tested in the competitive gel shift assay using a 3 P-end labeled human CTGF promoter fragment (-205 to -109). The intact fragment (-159 to -143) exhibits the highest affinity with complete competition at 20 ng. All other fragments which contain only a portion of this sequence are less effective with the -150 to -134 region being the least effective. Lanes 14 and 15 are the NF-1 and TIE like elements respectively and show no competition at 5000 fold molar excess of labeled probe.

FIGURE 7 shows point mutations in the TpRE decreases induction of the CTGF promoter by TGF-P.

FIGURE 8 panel A shows the effect of herbimycin, phorbol ester, cAMP and cholera toxin on TGF-P induced CTGF expression as measured in a luciferase assay.

FIGURE 8 panel B shows photomicrographs of NIH/3T3 cells either untreated, treated with TGF-p, cAMP (8Br cAMP) or cAMP and TGF-p.

FIGURE 8 panel C shows the results of inhibition of anchorage independent growth by 8Br cAMP and cholera toxin, and reversal of cAMP or cholera toxin inhibition of TGF- induced anchorage independent growth by CTGF.

DETAILED DESCRIPTION OF THE INVENTION The present invention discloses a novel protein growth factor called Connective Tissue Growth Factor (CTGF). This protein may play a significant role in the normal development, growth and repair of human tissue. The discovery of the CTGF protein and cloning of the cDNA encoding this molecule is significant in that it is a previously unknown growth factor having mitogenic and chemotactic activities for connective 10 tissue cells. The biological activity of CTGF is similar to that of PDGF, however, CTGF is the product of a gene unrelated to the A or B chain genes of PDGF. Since S: CTGF is produced by endothelial and fibroblastic cells, both of which are present at the site of a wound, it is probable that CTGF functions as a growth factor in wound healing.

Pathologically, CTGF may be involved in diseases in which there is an overgrowth of connective tissue cells, such as cancer, tumor formation and growth, fibrotic diseases pulmonary fibrosis, kidney fibrosis, glaucoma) and atherosclerosis.

The CTGF polypeptide is useful as a therapeutic in cases in which there is impaired healing of skin wounds or there is a need to augment the normal healing 20 mechanisms. Additionally, antibodies to CTGF polypeptide or fragments could be valuable as diagnostic tools to aid in the detection of diseases in which CTGF is a pathological factor. Therapeutically, antibodies or fragments of the antibody molecule could also be used to neutralize the biological activity of CTGF in diseases where CTGF is inducing the overgrowth of tissue.

The primary biological activity of CTGF polypeptide is its mitogenicity, or ability to stimulate target cells to proliferate. The ultimate result of this mitogenic activity in vivo, is the growth of targeted tissue. CTGF also possesses chemotactic activity, which is the chemically induced movement of cells as a result of interaction with particular molecules. Preferably, the CTGF of this invention is mitogenic and chemotactic for connective tissue cells, however, other cell types may be responsive to CTGF polypeptide as well.

The CTGF polypeptide of the invention is characterized by existing as a monomer of approximately 36-38 kD molecular weight. CTGF is secreted by cells and is active upon interaction with a receptor on a responsive cell. CTGF is antigenically related to PDGF although there is little if any peptide sequence homology. Anti-PDGF antibody has high affinity to the non-reduced forms of the PDGF isomers and the CTGF molecule and ten-fold less affinity to the reduced forms of these peptides, which lack biological activity. This suggests that there are regions of shared tertiary structure between the PDGF isomers and the CTGF molecule, resulting in common antigenic epitopes.

o 10 The term "substantially pure" as used herein refers to CTGF which is substantially S. free of other proteins, lipids, carbohydrates or other materials with which it is naturally associated. The substantially pure polypeptide will yield a single major band on a non-reducing polyacrylamide gel. The purity of the CTGF polypeptide can also be determined by amino-terminal amino acid sequence analysis. CTGF 15 polypeptide includes functional fragments of the polypeptide, so long as the mitogenic and chemotactic activities of CTGF are retained. Smaller peptides containing the biological activity of CTGF are included in the invention. Additionally, more effective CTGF molecules produced, for example, through site directed mutagenesis of the CTGF cDNA are included.

S. 20 The invention provides an isolated polynucleotide encoding the CTGF protein. The term "isolated" as used herein refers to a polynucleotide which is substantially free of other polynucleotides, proteins, lipids, carbohydrates or other materials with which it is naturally associated. These polynucleotides include DNA, cDNA and RNA sequences which encode connective tissue growth factor. It is understood that all polynucleotides encoding all or a portion of CTGF are also included herein, so long as they encode a polypeptide with the mitogenic and chemotactic activity of CTGF.

Such polynucleotides include naturally occurring forms, such as allelic variants, and intentionally manipulated forms, for example, mutagenized polynucleotides, as well as artificially synthesized polynucleotides. For example, CTGF polynucleotide may be subjected to site-directed mutagenesis. The polynucleotides of the invention include sequences that are degenerate as a result of the genetic code. There are only 20 natural amino acids, most of which are specified by more than one codon.

Therefore as long as the amino acid sequence of CTGF is functionally unchanged, all degenerate nucleotide sequences are included in the invention.

The term "polynucleotide" also denotes DNA, cDNA and RNA which encode untranslated sequences which flank the structural gene encoding CTGF. For example, a polynuclectide of the invention includes 5' regulatory nucleotide sequences and 3' untranslated sequences associated with the CTGF structural gene.

Tne polynucleotide of the invention which includes the 5' and 3' untranslated regicn is illustrated in FIGURE 1C. The 5' regulatory region, including the promoter, is illustrated in FIGURE 1B.

The sequence of the cDNA for CTGF contains an open reading frame of 1047 nucleotides with an initiation site at position 130 and a TGA termination site at 10 position 1177 and encodes a peptide of 349 amino acids. There is only a sequence homology between the CTGF cDNA and the cDNA for both the A and B chains of PDGF.

The present invention provides CTGF promoter nucleotides -823 to 74 (nucleotides 1 to 898; SEQ ID NO:1) as well as a TGF-P regulatory element 5 (TPRE) located between positions 162 and 128 (nucleotides 664 to 696: SEQ ID NO:1) of the CTGF promoter sequence. Methylation interference and competition gel shift assays map a unique 13-nucleotide sequence between positions 157 and 145 (nucleotides 667 to 679; SEQ ID NO:1) delineating a novel TGF-P cis-regulatory element.

2 The CTGF open reading frame encodes a polypeptide which contains 39 cysteine residues, indicating a protein with multiple intramolecular disulfide bonds. The amino terminus of the peptide contains a hydrophobic signal sequence indicative of a secreted protein and there are two N-linked glycosylation sites at asparagine residues 28 and 225 in the amino acid sequence. CTGF is a memeber of a protein family that includes serum induced immediate early gene products such as Cyr6l (O'Brien, et Mol. Cell. Bio/., 10:3569, 1990) and Fisp12 (Ryseck, et al., Cell Growth Differentiation, 2:225, 1 9 91)/BigM2(Brunner, et al., DNA and Cell Bio., 10:293. 1991); a v-src induced peptide (CEF-10)(Simmons et al., Proc. Natl. Acad.

Sci., USA, 86:1178, 1989) and a putative oncoprotein (nov)(Joliot. et Mcl. Cell.

Biol, 12:10, 1992). Twisted gastrulation (tsg). a gene that functions to control the induction of medial mescdermal elements in the dorsal/ventral patterning of Drcsophila embrycgenesis is more distantly related to CTGF (Mason, er al.. Genes and Devel., 8:1489, 1994). There is a 45% overall sequence homology between the CTGF polypeptide and the polypeptide encoded by the CEF-10 mRNA transcrict (Simmons, et al., Proc. Natl. Acad. Sci. USA 86:1178, 1989); the homology reaches 52% when a putative alternative splicing region is deleted.

DNA sequences of the invention can be obtained by several methods. For example, the DNA can be isolated using hybridization procedures which are well known in the art. These include, but are not limited to 1) hybridization of probes to genomic or cDNA libraries to detect shared nucleotide sequences and 2) antibody screening of expression libraries to detect shared structural features.

Screening procedures which rely on nucleic acid hybridization make it possible to isolate any gene sequence from any organism, provided the appropriate probe is 10 available. For example, oligonucleotide probes, which correspond to a part of the sequence encoding the protein in question, can be synthesized chemically. This requires that short, oligopeptide, stretches of amino acid sequence must be known.

The DNA sequence encoding the protein can be deduced from the genetic code, however, .the degeneracy of the code must ube taken into account. it is possible to perform a mixed addition reaction when the sequence is degenerate. This includes a heterogeneous mixture of denatured double-stranded DNA. For such screening, hybridization is preferably performed on either single-stranded DNA or denatured double-stranded DNA. Hybridization is particularly useful in the detection of cDNA clones derived from sources where an extremely low amount of mRNA sequences relating to the polypeptide of interest are present. In other words, by using stringent hybridization conditions directed to avoid non-specific binding, it is possible, for example, to allow the autoradiographic visualization of a specific cDNA clone by the hybridization of the target DNA to that single probe in the mixture which is its complete complement (Wallace, et al., Nucleic Acid Research, 9:879, 1981).

A cDNA expression library, such as lambda gt11, can be screened indirectly for CTGF peptides having at least one epitope, using antibodies specific for CTGF or antibodies to PDGF which cross react with CTGF. Such antibodies can be either polyclonally or monoclonally derived and used to detect expression product indicative of the presence of CTGF cDNA.

DNA sequences encoding CTGF can be expressed in vitro by DNA transfer into a suitable host cell. "Host cells" are cells in which a vector can be propagated and its DNA expressed. The term also includes any progeny of the subject host cell. It is 11.

understood that all progeny may not be identical to the parental cell since there may be mutations that occur during replication. However, such progeny are included when the term "host cell" is used.

DNA sequences encoding CTGF can be expressed in vivo in either prokaryotes or eukaryotes. Methods of expressing DNA sequences having eukaryotic coding sequences in prokaryotes are well known in the art. Hosts include microbial, yeast and mammalian organisms.

Biologically functional viral and plasmid DNA vectors capable of expression and replication in a host are known in the art. Such vectors are used to incorporate DNA sequences of the invention. In general, expression vectors containing promotor sequences which facilitate the efficient transcription of the inserted eukaryotic genetic sequence are used in connection with the host. The expression vector typically contains an origin of replication, a promoter, and a terminator, as well as specific Igenes which are capable of providing phenotypic selection of thLie transformed ce!!s.

In addition to expression vectors known in the art such as bacterial, yeast and mammalian expression systems, baculovirus vectors may also be used. One advantage to expression of foreign genes in this invertebrate virus expression vector is that it is capable of expression of high levels of recombinant proteins, which are antigenically and functionally similar to their natural counterparts. Baculovirus vectors and the appropriate insect host cells used in conjunction with the vectors will be known to those skilled in the art.

The term "recombinant expression vector" refers to a plasmid, virus or other vehicle known in the art that has been manipulated by insertion or incorporation of the CTGF genetic sequences. Such expression vectors contain a promoter sequence which facilitates the efficient transcription of the inserted genetic sequence of the host. The expression vector typically contains an origin of replication, a promoter, as well as specific genes which allow phenotypic selection of the transformed cells. Vectors suitable for use in the present invention include, but are not limited to the T7-based expression vector for expression in bacteria (Rosenberg, etal., Gene, 56:125, 1987), the pMSXND expression vector for expression in mammalian cells (Lee and Nathans, J. Biol. Chem., 263:3521, 1988) and baculovirus-derived vectors for expression in insect cells. The DNA segment can be present in the vector operably linked to regulatory elements, for example, a promoter T7, metallothionein

I,

or polyhedrin promoters).

The vector may include a phenotypically selectable marker to identify host cells which contain the expression vector. Examples of markers typically used in prokaryotic expression vectors include antibiotic resistance genes for ampicillin (3lactamases), tetracycline and chloramphenicol (chloramphenicol acetyltransferase).

Examples of such markers typically used in mammalian expression vectors include the gene for adenosine deaminase (ADA), aminoglycoside phosphotransferase (neo, -G418), dihydrofolate reductase (DHFR), hygromycin-B-phosphotransferase

(HPH),

10 thymidine kinase and xanthine guanine phosphoribosyltransferse

(XGPRT,

gpt).

The isolation and purification of host cell expressed polypeptides of the invention may be by any conventional means such as, for example, preparative chromatoaranhi.r pnar=atinnc nnrj imrm, S--rchromatographic .searati-ons and immungica separations suchU; as those involving 15 the use of monoclonal or polyclonal antibody.

Transformation of the host cell with the recombinant DNA may be carried out by conventional techniques well known to those skilled in the art. Where the host is prokaryotic, such as E. coli, competent cells which are capable of DNA uptake can be prepared from cells harvested after exponential growth and subsequently treated .20 by the CaC 2 I method using procedures well known in the art. Alternatively, MgCI 2 or RbCI could be used.

Where the host used is a eukaryote, various methods of DNA transfer can be used.

These include transfection of DNA by calcium phosphate-precipitates, conventional mechanical procedures such as microinjection, insertion of a plasmid encased in liposomes, or the use of virus vectors. Eukaryotic cells can also be cotransformed with DNA sequences encoding the polypeptides of the invention, and a second foreign DNA molecule encoding a selectable phenotype, such as the herpes simplex thymidine kinase gene. Another method is to use a eukaryotic viral vector, such as simian virus 40 (SV40) or bovine papilloma virus, to transiently infect or transform eukaryotic cells and express the protein. (Eukaryotic Viral Vectors, Cold Spring Harbor Laboratory, Gluzman ed., 1982). Examples of mammalian host cells include COS, BHK, 293, and CHO cells.

13.

Eukaryotic host cells may also include yeast. For example, DNA can be expressed in yeast by inserting the DNA into appropriate expression vectors and introducing the product into the host cells. Various shuttle vectors for the expression of foreign genes in yeast have been reported (Heinemann, J. et al., Nature, 340:205, 1989; Rose, M. et al., Gene, 60:237, 1987).

The invention provides antibodies which are specifically reactive with CTGF polypeptide or fragments thereof. Although this polypeptide is cross reactive with antibodies to PDGF, not all antibodies to CTGF will also be reactive with PDGF.

Antibody which consists essentially of pooled monoclonal antibodies with different 10 epitopic specificities, as well as distinct monoclonal antibody preparations are provided. Monoclonal antibodies are made from antigen containing fragments of the protein by methods well known in the art (Kohler, et al., Nature, 256:495, 1975; Current Protocols in Molecular Biology, Ausubel, et al., ed., 1989). Monoclonal antibodies specific for CTGF can be selected, for example, by screening for 15 -hybridoma culture supe-rnqatants wich react with CTGF F, but o or c with PDF Antibody which consists essentially of pooled monoclonal antibodies with different epitopic specificities, as well as distinct monoclonal antibody preparations are provided. Monoclonal antibodies are made from antigen containing fragments of the protein by methods well known in the art (Kohler, et al., Nature, 256:495, 1975; Current Protocols in Molecular Biology, Ausubel, et al., ed., 1989).

The term "antibody" as used in this invention includes intact molecules as well as fragments thereof, such as Fab, F(ab') 2 and Fv which are capable of binding the epitopic determinant. These antibody fragments retain some ability to selectively bind with its antigen or receptor and are defined as follows: Fab, the fragment which contains a monovalent antigen-binding fragment of an antibody molecule can be produced by digestion of whole antibody with the enzyme papain to yield an intact light chain and a portion of one heavy chain; Fab', the fragment of an antibody molecule can be obtained by treating whole antibody with pepsin, followed by reduction, to yield an intact light chain and a portion of the heavy chain; two Fab' fragments are obtained per antibody molecule; 14.

(Fab') 2 the fragment of the antibody that can be obtained by treating whole antibody with the enzyme pepsin without subsequent reduction; F(ab') 2 is a dimer of two Fab' fragments held together by two disulfide bonds; Fv, defined as a genetically engineered fragment containing the variable region of the light chain and the variable region of the heavy chain expressed as two chains; and Single chain antibody defined as a genetically engineered molecule containing the variable region of the light chain, the variable region of the heavy chain, linked by a suitable polypeptide linker as a genetically fused single chain molecule.

Methods of making these fragments are known in the art. (See for example, Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, New York (1988), incorporated herein by reference).

As used in this invention, the term "epitope" means any antigenic determinant on an 15 antigen to which the paratope of an antibody binds. Epitopic determinants usually consist of chemically active surface groupings of molecules such as amino acids or sugar side chains and usually have specific three dimensional structural characteristics, as well as specific charge characteristics.

Antibodies which bind to CTGF polypeptide of the invention can be prepared using an intact polypeptide or fragments containing small peptides of interest as the immunizing antigen. The polypeptide or a peptide used to immunize an animal can be derived from translated cDNA or chemical synthesis which can be conjugated to a carrier protein, if desired. Such commonly used carriers which are chemically coupled to the peptide include keyhole limpet hemocyanin (KLH), thyroglobulin, bovine serum albumin (BSA), and tetanus toxoid. The coupled peptide is then used to immunize the animal a mouse, a rat, or a rabbit).

If desired, polyclonal or monoclonal antibodies can be further purified, for example, by binding to and elution from a matrix to which the polypeptide or a peptide to which the antibodies were raised is bound. Those of skill in the art will know of various techniques common in the immunology arts for purification and/or concentration of polyclonal antibodies, as well as monoclonal antibodies (See for example, Coligan, et al., Unit 9, Current Protocols in Immunology, Wiley Interscience, 1994, incorporated herein by reference).

It is also possible to use the anti-idiotype technology to produce monoclonal antibodies which mimic an epitope. For example, an anti-idiotypic monoclonal antibody made to a first monoclonal antibody will have a binding domain in the hypervariable region which is the "image" of the epitope bound by the first monoclonal antibody.

The invention provides a method for accelerating wound healing in a subject, e.g., 10 a human, by applying to the wound an effective amount of a composition which contains CTGF, preferably purified. PDGF and PDGF-related molecules, such as CTGF, are involved in normal healing of skin wounds. The CTGF polypeptide of this invention is valuable as a therapeutic in cases in which there is impaired healing of skin wounds or there is a need to augment the normal healing mechanisms, e.g., 15 burns. One important advantage to using CTGF protein to accelerate wound healing is attributable to the molecule's high percentage of cysteine residues. CTGF, or functional fragments thereof, is more stable and less susceptible to protease degradation than PDGF and other growth factors known to be involved in wound healing.

20 CTGF is produced by endothelial cells and fibroblastic cells, both of which are present at the site of a skin wound. Therefore, agents which stimulate the production of CTGF can be added to a composition which is used to accelerate wound healing.

Preferably, the agent of this invention is transforming growth factor beta (TGF-0), however, it is likely that other TGF- family members will also be useful in accelerating wound healing by inducing CTGF. The composition of the invention aids in healing the wound, in part, by promoting the growth of connective tissue. The composition is prepared by combining, in a pharmaceutically acceptable carrier substance, inert gels or liquids, the purified CTGF and TGF-.

The term "cell proliferative disorder" refers to pathological states characterized by the continual multiplication of cells resulting in an overgrowth of a cell population within a tissue. The cell populations are not necessarily transformed, tumorigenic or malignant cells, but can include normal cells as well. For example. CTGF may be involved pathologically by inducing a proliferative lesion in the intimal layer of an arterial wall, resulting in atherosclerosis. Instead of trying to reduce risk factors for the disease, lowering blood pressure or reducing elevated cholesterol levels in a subject, CTGF inhibitors or antagonists of the invention would be useful in interfering with the in vivo activity of CTGF associated with atherosclerosis.

CTGF

antagonists are useful in treating other disorders associated with overgrowth of connective tissues, such as various fibrotic diseases, including scleroderma, arthritis, alcoholic liver cirrhosis, keloid, and hypertropic scar.

The present invention provides a method to detect the presence of elevated levels 10 of CTGF to be used diagnostically to determine the presence of pathologies characterized by a cell proliferative disorder. For example, a sample suspected of Scontaining CTGF is obtained from a subject, the level of CTGF determined and this level is compared with the level of CTGF in normal tissue. The level of CTGF can be determined by immunoassays using anti-CTGF antibodies, for example. Other 15 variations of such assays which are well known to those skilled in the art, such as radioimmunoassay (RIA), ELISA and immunofluorescence can also be used to determine CTGF levels in a sample. Alternatively, nucleic acid probes can be used to detect and quantitate CTGF mRNA for the same purpose.

The invention also discloses a method for ameliorating diseases characterized by a cell proliferative disorder by treating the site of the disease with an effective amount of a CTGF reactive agent. The term "ameliorate" denotes a lessening of the detrimental effect of the disease-inducing response in the patient receiving therapy.

Where the disease is due to an overgrowth of cells, an antagonist of CTGF polypeptide is effective in decreasing the amount of growth factor that can bind to a CTGF specific receptor on a cell. Such an antagonist may be a CTGF specific antibody or functional fragments thereof Fab, F(ab') 2 Alternatively, a polynucleotide containing the TPRE region of the promoter may be used as a CTGF reactive agent by acting as a competitor for TGF-. The treatment requires contacting the site of the disease with the antagonist. Where the cell proliferative disorder is due to a diminished amount of growth of cells, a CTGF reactive agent which is stimulatory is contacted with the site of the disease. For example, TGF- Sis one such reactive agent. Other agents will be known to those skilled in the art.

17.

When a cell proliferative disorder is associated with the expression of CTGF, a therapeutic approach which directly interferes with the translation of CTGF messages into protein is possible. For example, antisense nucleic acid or ribozymes could be used to bind to the CTGF mRNA or to cleave it. Antisense RNA or DNA molecules bind specifically with a targeted gene's RNA message, interrupting the expression of that gene's protein product. The antisense binds to the messenger RNA forming a double stranded molecule which cannot be translated by the cell. Antisense oligonucleotides of about 15-25 nucleotides are preferred since they are easily synthesized and have an inhibitory effect just like antisense RNA molecules. In 10 addition, chemically reactive groups, such as iron-linked ethylenediaminetetraacetic acid (EDTA-Fe) can be attached to an antisense oligonucleotide, causing cleavage of the RNA at the site of hybridization. These and other uses of antisense methods to inhibit the in vitro translation of genes are well known in the art (Marcus-Sakura, Anal., Biochem., 172:289, 1988).

15 Antisense nucleic acids are DNA or RNA molecules that are complementary to at least a portion of a specific mRNA molecule (Weintraub, Scientific American, 262:40, 1990). In the cell, the antisense nucleic acids hybridize to the corresponding mRNA, forming a double-stranded molecule. The antisense nucleic acids interfere with the translation of the mRNA, since the cell will not translate a mRNA that is double- S 20 stranded. Antisense oligomers of about 15 nucleotides are preferred, since they are easily synthesized and are less likely to cause problems than larger molecules when introduced into the target CTGF producing cell. The use of antisense methods to inhibit the in vitro translation of genes is well known in the art (Marcus-Sakura, Anal.Biochem., 172:289, 1988).

Use of an oligonucleotide to stall transcription is known as the triplex strategy since the oligomer winds around double-helical DNA, forming a three-strand helix.

Therefore, these triplex compounds can be designed to recognize a unique site on a chosen gene (Maher, et al., Antisense Res. and Dev., 1(3):227, 1991; Helene, C., Anticancer Drug Design, 6{6}:569, 1991) for example, the TPRE region of the CTGF promoter.

Ribozymes are RNA molecules possessing the ability to specifically cleave other single-stranded RNA in a manner analogous to DNA restriction endonucleases.

Through the modification of nucleotide sequences which encode these RNAs, it is possible to engineer molecules that recognize specific nucleotide sequences in an RNA molecule and cleave it (Cech, J.Amer.Med. Assn., 260:3030, 1988). A major advantage of this approach is that, because they are sequence-specific, only mRNAs with particular sequences are inactivated.

There are two basic types of ribozymes namely, tetrahymena-type (Hasselhoff, Nature, 334:585, 1988) and "hammerhead"-type. Tetrahymena-type ribozymes recognize sequences which are four bases in length, while "hammerhead"-type ribozymes recognize base sequences 11-18 bases in length. The longer the recognition sequence, the greater the likelihood that the sequence will occur 10 exclusively in the target mRNA species. Consequently, hammerhead-type ribozymes are preferable to tetrahymena-type ribozymes for inactivating a specific mRNA species and 18-based recognition sequences are preferable to shorter recognition sequences.

The identification of the promoter element of the CTGF gene and specifically, the TGF-g responsive/regulatory element (TORE) (5'-GTGTCAAGGGGTC-3' (SEQ ID NO:8); nucleotides -157 and -145), provides a source for a screening method for identifying compounds or compositions which affect the expression of CTGF. Thus, in another embodiment, the invention provides a method for identifying a composition which affects CTGF expression comprising incubating components comprising the composition and a TGF-3 responsive element of the CTGF promoter, wherein the incubating is carried out under conditions sufficient to allow the components to interact; and measuring the effect of the composition on CTGF expression. The method further comprises adding TGF-, or a TGF- family member reactive with the TORE, to the reaction mixture. Therefore, the method allows identification of TGFinhibitors, or anti-fibrotic compounds. Preferably, the promoter region used in the screening assays described herein includes nucleotides -823 to +74. however, smaller regions that include the TGF-3 responsive element would also be useful in the method of the invention -162 to -128 or- 157to -145).

The observed effect on CTGF expression may be either inhibitory or stimulatory. For example, the increase or decrease of CTGF activity can be measured by a biological assay for CTGF, as described in the examples herein EXAMPLES 1 and 2).

Alternatively, a polynucleotide encoding both the regulatory (promoter) and structural region of CTGF may be inserted intc an expression vector and the effect of a

F

composition on transcription of CTGF can be measured, for example, by Northern blot analysis. A radioactive compound is added to the mixture of components, such as 32 P-ATP, and radioactive incorporation into CTGF mRNA is measured.

Alternatively, a composition which affects the expression of CTGF can be identified by operably linking a reporter gene with the TGF-p responsive region of the promoter of CTGF, incubating the components including the composition being tested, the reporter gene construct and TGF-0 and assaying for expression of the reporter gene.

Such reporter genes will be known to those of skill in the art, and include but are not limited to a luciferase gene, chloramphenicol acetyl transferase gene (CAT assay) or P- 10 galactosidase gene.

SThe inducer of the TPRE can be added prior to or following the addition of the composition to be tested. Preferably, it is added after the composition is added. An inducer of this region in the CTGF promoter is preferably TGF-, however, it is likely that other members of the TGF-p family will also be useful for induction from this element. Other such family members or factors will be known to those of skill in the art.

The method of the invention is preferably performed in an indicator cell. An "indicator cell" is one in which activation of CTGF or the reporter gene can be detected.

Examples of mammalian host indicator cells include the pre-B cell line, 70Z/3, Jurkat T, COS, BHK, 293, CHO, HepG2, and HeLa cells. Other cell lines can be utilized as indicator cells, as long as the level of reporter gene can be detected. The cells can be recombinantly modified to contain an expression vector which encodes one or more additional copies of the TpRE binding motif, preferably operatively linked to a reporter gene. The cells can also be modified to express CTGF, as described above.

The reporter gene is a phenotypically identifiable marker for detection of stimulation or inhibition of CTGF activation. Markers preferably used in the present invention include the LUC gene whose expression is detectable by a luciferase assay.

Examples of markers typically used in prokaryotic expression vectors include antibiotic resistance genes for ampicillin (P-lactamases), tetracycline and chloramphenicol (chloramphenicol acetyltransferase). Examples of such markers typically used in mammalian expression vectors, which are preferable for the present invention, include the gene for adenosine deaminase (ADA), aminoglycoside phosphotransferase (neo, G418), dihydrofolate reductase (DHFR), hygromycin-8phosphotransferase (HPH), thymidine kinase xanthine guanine phosphoribosyltransferse (XGPRT, gpt) and P-galactosidase (3-gal).

In yet another embodiment, the invention provides a method of treating a subject having a cell proliferative disorder associated with CTGF gene expression in a subject, comprising administering to a subject having the disorder a therapeutically effective amount of an agent which modulates CTGF gene expression, thereby treating the disorder. The term "modulate" refers to inhibition or suppression of CTGF expression when CTGF is overexpressed, and induction of expression when 10 CTGF is underexpressed. The term "therapeutically effective" means that amount of CTGF agent which is effective in reducing the symptoms of the CTGF associated cell proliferative disorder.

T

The agent which modulates CTGF gene expression may be a polynucleotide for example. The polynucleotide may be an antisense, a triplex agent, or a ribozyme, as 15 described above. For example, an antisense may be directed to the structural gene region or to the promoter region of CTGF.

The agent also includes a polynucleotide which includes the TRE of the invention.

Preferably this region corresponds to nucleotides -162 to -128 of the CTGF .*o0 regulatory polypeptide illustrated in FIGURE 18. More specifically, the TORE region :20 corresponds to about-157 to -145 in FIGURE 1B. These polynucleotides are useful as competitive inhibitors or pseudosubstrates for TGF- or other growth factors which bind to the TpRE and induce CTGF transcription.

Delivery of antisense, triplex agents, ribozymes, competitive inhibitors and the like can be achieved using a recombinant expression vector such as a chimeric virus or a colloidal dispersion system. Various viral vectors which can be utilized for gene therapy as taught herein include adenovirus, herpes virus, vaccinia, or, preferably, an RNA virus such as a retrovirus. Preferably, the retroviral vector is a derivative of a munne or avian retrovirus. Examples of retroviral vectors in which a single foreign gene can be inserted include, but are not limited to: Moloney murine leukemia virus (MoMuLV), Harvey murine sarcoma virus (HaMuSV), murine mammary tumor virus (MuMTV), and Rous Sarcoma Virus (RSV). A number of additional retroviral vectors can incorporate multiple genes. All of these vectors can transfer or incorporate a gene for a selectable marker so that transduced cells can be identified and generated. By inserting a polynucleotide sequence of interest into the viral vector, along with another gene which encodes the ligand for a receptor on a specific target cell, for example, the vector is now target specific. Retroviral vectors can be made target specific by inserting, for example, a polynucleotide encoding a sugar, a glycolipid, or a protein. Preferred targeting is accomplished by using an antibody to target the retroviral vector. Those of skill in the art will know of, or can readily ascertain without undue experimentation, specific polynucleotide sequences which can be inserted into the retroviral genome to allow target specific delivery of the 10 retroviral vector containing the antisense polynucleotide.

Since recombinant retroviruses are defective, they require assistance in order to produce infectious vector particles. This assistance can be provided, for example, by using helper cell lines that contain plasmids encoding all of the structural genes of the retrovirus under the control of regulatory sequences within the LTR. These plasmids are missing a nucleotide sequence which enables the packaging mechanism to recognize an RNA transcript for encapsidation. Helper cell lines which have deletions of the packaging signal include but are not limited to L42, PA317 and PA12, for example. These cell lines produce empty virions, since no genome is packaged. If a retroviral vector is introduced into such cells in which the packaging signal is intact, but the structural genes are replaced by other genes of interest, the vector can be packaged and vector virion produced.

Alternatively, NIH 3T3 or other tissue culture cells can be directly transfected with plasmids encoding the retroviral structural genes gag, pol and env, by conventional calcium phosphate transfection. These cells are then transfected with the vector plasmid containing the genes of interest. The resulting cells release the retroviral vector into the culture medium.

Another targeted delivery system for antisense polynucleotides a colloidal dispersion system. Colloidal dispersion systems include macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes. The preferred colloidal system of this invention is a liposome. Liposomes are artificial membrane vesicles which are useful as delivery vehicles in vitro and in vivo. It has been shown that large unilamellar vesicles (LUV), which range in size from 0.2-4.0 um can encapsulate a substantial percentage of an aqueous buffer containing large macromolecules.

RNA,

DNA and intact virions can be encapsulated within the aqueous interior and be delivered to cells in a biologically active form (Fraley, et al., Trends Biochem. Sci., 6:77, 1981). In addition to mammalian cells, liposomes have been used for delivery of polynucleotides in plant, yeast and bacterial cells. In order for a liposome to be an efficient gene transfer vehicle, the following characteristics should be present: (1) encapsulation of the genes of interest at high efficiency while not compromising their biological activity; preferential and substantial binding to a target cell in comparison to non-target cells; delivery of the aqueous contents of the vesicle to 10 the target cell cytoplasm at high efficiency; and accurate and effective expression of genetic information (Mannino, et al., Biotechniques, 6:682, 1988).

.4 The composition of the liposome is usually a combination of phospholipids, particularly high-phase-transition-temperature phospholipids, usually in combination with steroids, especially cholesterol. Other phospholipids or other lipids may also be 15 .used. The physica characteristics liposomes depend on pH, ionic strength, and the presence of divalent cations.

Examples of lipids useful in liposome production include phosphatidyl compounds, such as phosphatidylglycerol, phosphatidylcholine, phosphatidylserine, S. phosphatidylethanolamine, sphingolipids, cerebrosides, and gangliosides.

20 Particularly useful are diacylphosphatidylglycerols, where the lipid moiety contains from 14-18 carbon atoms, particularly from 16-18 carbon atoms, and is saturated.

Illustrative phospholipids include egg phosphatidylcholine, dipalmitoylphosphatidylcholine and distearoylphosphatidylcholine.

The targeting of liposomes has been classified based on anatomical and mechanistic factors. Anatomical classification is based on the level of selectivity, for example, organ-specific, cell-specific, and organelle-specific. Mechanistic targeting can be distinguished based upon whether it is passive or active. Passive targeting utilizes the natural tendency of liposomes to distribute to cells of the reticulo-endothelial system (RES) in organs which contain sinusoidal capillaries. Active targeting, on the other hand, involves alteration of the liposome by coupling the liposome to a specific ligand such as a monoclonal antibody, sugar, glycolipid, or protein, or by changing the composition or size of the liposome in order to achieve targeting to organs and cell types other than the naturally occurring sites of localization.

The surface of the targeted delivery system may be modified in a variety of ways.

In the case of a liposomal targeted delivery system, lipid groups can be incorporated into the lipid bilayer of the liposome in order to maintain the targeting ligand in stable association with the liposomal bilayer. Various linking groups can be used for joining the lipid chains to the targeting ligand. In general, the compounds bound to the surface of the targeted delivery system will be ligands and receptors which will allow the targeted delivery system to find and "home in" on the desired cells. A ligand may be any compound of interest which will bind to another compound, such as a receptor.

10 The agent which modulates CTGF gene expression in the method of the invention includes agents which cause an elevation in cyclic nuclotides in the cell. For example, agents such as cholera toxin or 8Br-cAMP are preferably administered to a subject having a cell proliferative disorder associated with CTGF gene expression.

Preferably, the cyclic nucleotide that is elevated after treatment in the method of the invention is cAMP or a cAMP analog, either functional or structural, or both. Those of skill in the art will know of other agents which induce cAMP or similar analogs in a cell and which are useful in the method of the invention.

The therapeutic agents useful in the method of the invention can be administered :parenterally by injection or by gradual perfusion over time. Administration may be intravenously, intraperitoneally, intramuscularly, subcutaneously, intracavity, or transdermally.

Preparations for parenteral administration include sterile aqueous or non-aqueous solutions, suspensions, and emulsions. Examples of non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and injectable organic esters such as ethyl oleate. Aqueous carriers include water, alcoholic/aqueous solutions, emulsions or suspensions, including saline and buffered media. Parenteral vehicles include sodium chloride solution, Ringer's dextrose, dextrose and sodium chloride, lactated Ringer's intravenous vehicles include fluid and nutrient replenishers, electrolyte replenishers (such as those based on Ringer's dextrose), and the like. Preservatives and other additives may also be present such as, for example, antimicrobials, anti-oxidants, chelating agents and inert gases and the like.

The invention also includes a pharmaceutical composition comprising a therapeutically effective amount of CTGF in a pharmaceutically acceptable carrier.

Such carriers include those listed above with reference to parenteral administration.

The present Examples (see EXAMPLE 10), demonstrate that TGF-p induction of CTGF is cell type specific fibroblast). Consequently, the CTGF promoter region, including the T3RE, is useful for the expression of a structural gene specifically in connective tissue cells. It is envisioned that any gene product of interest can be specifically produced in a connective tissue cell, once operably linked to the TpRE, and in the presence of TGF-P. For example, it may be desirable to operably link PDGF or another growth factor to a polynucleotide containing TpRE, thereby specifically producing PDGF or another factor in a connective tissue cell. Alternatively, in cases where the level of CTGF or other factor produced is elevated, it may be desirable to introduce an antisense for CTGF, for example, under control of TpRE, thereby decreasing the production of CTGF in the cell.

Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

The following examples are intended to illustrate but not limit the invention.

While they are typical of those that might be used, other procedures known to those skilled in the art may alternatively be used.

EXAMPLE 1 IDENTIFICATION AND PARTIAL PURIFICATION OF MITOGEN FROM 25 HUVE CELLS PDGF-IMMUNORELATED Cells Human umbilical vein endothelial (HUVE) cells were isolated from fresh human umbilical cords by collagenase perfusion (Jaffe, et al, Human Pathol., 18:234, 1987) and maintained in medium 199 with 20% FCS, 0.68 mM L-glutamine, 20 ag/ml **Gentamicin, 90 ng/ml porcine heparin *o~ (Sigma, St. Louis, MO), and 50ig/ml Endothelial Cell Growth Supplement (Sigma). Cells used for media collection were third passage cells. Cells were identified as endothelial cells by their non-overlapping cobblestone morphology and by positive staining for Factor-VIII related antigen. NRK cells were obtained from American Type Culture, NIH/3T3 cells were a gift from S.

Aaronson (NCI, Bethesda, MD), and both cell lines were maintained in

S

*S

oo* o

S

DMEM, 10% FCS, 20pg/ml Gentamicin. Fetal bovine aortic smooth muscle cells were obtained from tissue explants as previously described (Grotendorst, et al., Proc.

Natl. Acad. Sci. USA, 78:3669, 1981) and maintained in DMEM, 10% FCS, Gentamicin, and used in assays at second or third passage.

Growth Factors and Antibodies Human PDGF was purified to homogeneity from platelets as described previously (Grotendorst, Cell, 36:279, 1984). Recombinant AA, BB, and AB chain dimeric PDGF molecules were obtained from Creative Biomolecules, (Hopkinton, MA). FGF was obtained from Sigma. Purified PDGF or synthetic peptides containing the amino 10 and carboxyl sequences of the mature PDGF A and B chain molecules were used to raise antibodies in goats. Goats were immunized with 20pg of purified PDGF or of synthetic peptide in Freunds complete adjuvant by multiple intradermal injections. Immune sera were collected seven days afstr the fourth rechallenge (in Freunds incomplete adjuvant) and subsequentUI rehatIllyn The anti-PDGF 15 antibody did not show any cross-reactivity to TGF-0, EGF, or FGF in immunoblot analysis. The anti-peptide antibodies were sequence specific and did not cross-react with other synthetic peptide sequences or with recombinant PDGF peptides which did not contain the specific antigenic sequence. This was determined by Western blot and dot blot analysis.

Antibody Affinity Column Goat anti-human PDGF IgG (150 mg) was covalently bound to 25 mis of Affi-Gel support (BioRad) according to the manufacturers instructions with a final concentration of 6 mg IgG/ml gel. The column was incubated with agitation at for 18 hours with 1 liter of HUVE cell media which had been conditioned for 48 hours.

The gel was then poured into a column (5 X 1.5 cm), washed with four volumes of 0.1 N acetic acid made pH 7.5 with ammonium acetate, and the antibody-bound PDGF immunoreactive proteins eluted with 1 N acetic acid. Peak fractions were determined by biological assays and immunoblotting and the fractions pooled.

Initial studies of the PDGF-related growth factors secreted by HUVE cells were done by removing the serum containing growth media from confluent cultures of cells and replacing it with serum-free media. Aliquots of this media were removed periodically and the proteins immunoblotted using an antibody specific for human platelet PDGF.

This antibody does not cross-react with any other known growth factors and is able to detect less than 500 picograms of dimeric PDGF or 10 nanograms of reduced, monomeric A or B chain peptide on immunoblots. HUVE cells were grown to confluence in 6 well plates. The growth media was removed, cells washed with PBS and 1 ml of serum-free media was added to each well. The media was removed after conditioning for the period of time from 6-48 hours, dialyzed against 1 N acetic acid and lyophilized. The samples were then run on 12% PAGE, electroblotted to nitrocellulose and visualized with the anti-human PDGF antibody. Five nanograms of purified platelet PDGF was run as reference.

The results indicated constitutive secretion of several species of molecules which are immunologically similar to platelet PDGF but are of higher relative molecular weight (36-39 kD) than the expected 30-32 kD MW of platelet PDGF or A chain or B chain homodimers. Chemotactic and mitogenic assays performed with this serum-free conditioned media indicated the total biological activity present was equivalent to ng/ml of platelet PDGF after a 48 hour conditioning period. Incubation of the media with 30 pg/ml of anti-human PDGF IgG neutralized approximately 20-30% of the mitogenic activity and similar amount of the chemotactic activity.

The presence in HUVE culture media of several species of PDGF immunoreactive molecules was unexpected, particularly molecules of higher molecular weight than those of the A and B chain dimeric molecules anticipated to be produced and secreted by endothelial cells (Collins, et al., Nature, 328:621-624, 1987; Sitaras, et al., J. Cell. Physiol., 132:376-380, 1987). In order to obtain greater amounts of the PDGF-like proteins for further analysis, the HUVE cells had to be kept in media containing 20% fetal calf serum, since the cells begin to die after 24 hours in serumfree or low serum media. The PDGF immunoreactive proteins were partially purified from the serum containing media by use of an antibody affinity column made with the anti-human PDGF IgG and an Affi-Gel 10 support (BioRad). Mitogenic assays were performed using NRK cells as target cells (PDGF BB 5 ng/ml, PDGF AA ng/ml). HUVE media was 250 pl of HUVE cell serum-free conditioned media (48 hours) which was dialyzed against 1 N acetic acid, lyophilized, and resuspended in DMEM before addition to test wells. Affinity purified fraction was 5 pl/ml of combined, concentrated major pool from Affi-Gel 10 affinity column. Anti-PDGF IgG or non-immune IgG (30 pg/ml) was added to the samples and incubated 18 hours at 4°C prior to testing in the mitogenic assay. The mean of triplicate samples was determined and the standard deviation was less than The experiments were repeated at least three times with similar results.

When aliquots of the partially purified proteins were assayed for chemotactic and mitogenic activity, all biological activity could be neutralized by prior incubation of the proteins with the anti-human PDGF antibody. This indicated that the only biologically active molecules present in the partially purified media proteins were PDGF immunorelated molecules.

Aliquots of the partially purified proteins were immunoblotted using the same anti- PDGF antibody and the data indicated the presence of the higher MW molecules observed in the serum-free conditioned media. The major species secreted migrates on polyacrylamide gels at 36kD and comprises at least 50% of the total immunoreactive protein purified from conditioned media. The immunoreactive species migrating at 37 and 39 kD constitute most of the remaining immunoreactive 15 protein. A similar pattern was seen with proteins labeled with 35 S-cysteine and affinity purified with the anti-PDGF IgG immunoaffinity column. Less than 15% of the total affinity purified proteins co-migrated with purified platelet PDGF or recombinant PDGF isoforms.

Prior incubation of the antibody with purified PDGF (300 ng PDGF/2 pg IgG) blocked antibody binding to all of the molecules, indicating shared antigenic determinants with dimeric platelet PDGF. Interestingly, when the antibody was blocked with recombinant AA, BB, or AB dimers, antibody binding to the HUVE secreted proteins was inhibited equally by all three dimeric forms, suggesting that the antibody recognizes common epitopes present on all three PDGF dimers and the HUVE secreted molecules. In order to insure that none of the antibody binding molecules detected on Western blots was derived from fetal calf serum or other additives in the culture media, a new, unused antibody affinity column was made and media which was never conditioned by cells was processed exactly as the conditioned media. No PDGF immunoreactive molecules were detected in the fractions from this column by immunoblot and no biological activity was detected. When platelet PDGF or the recombinant dimers are reduced with 200 mM dithiothreitol (DTT), monomeric A chain (17 kD) and B chain (14 kD) peptides are observed on immunoblots. Treating the HUVE molecules in a 100 mM DTT sample buffer resulted in slower migration of the major immunoreactive peptides on polyacrylamide gels. Most of the immunoreactive molecules migrated at 38-39 kD and less intense bands were observed at 25 and 14 kD. It was necessary to run at least 10 times as much reduced protein as nonreduced in order to detect the reduced molecules. This is consistent with the affinity of the antibody for monomeric forms of the PDGF A and B chain peptides. These data indicate that the major species in the PDGF-related affinity purified proteins from conditioned media of HUVE cells was monomeric peptide which migrates on acrylamide gels at an apparent molecular weight of 36 kD nonreduced and 38 kD when reduced.

1 0 EXAMPLE 2 S..4 BIOLOGICAL ASSAYS Chemotactic activity was determined in the Boyden chamber chemotaxis assay with NIH 3T3 or bovine aortic smooth muscle (BASM) cells as described (Grotendorst, et a

D

r N -VL. Acad. OSc. JUS, It:3669-36 72, 1981; Grotendorst, et al., Methods 15 in Enzymol., 147:144-152, 1987). Mitogenic assays were performed using 96 well plates and normal rat kidney (NRK) fibroblasts or NIH 3T3 cells as target cells. The cells were plated in DMEM, 10% FCS; NRK cell cultures were used 10-14 days after confluence and 3T3 cells made quiescent by incubation for 2 days in serum-free DMEM, 0.2 mg/ml BSA before use. Sample proteins and dilutions of known standards were added to the wells and the plates incubated at 37°C in 10% CO2, air for 18 hours, after which 'H-thymidine at a final concentration of 5 uCi/ml was added and incubated for an additional 2 hours. The media was removed, the cells washed and DNA synthesis determined from the 3 H-thymidine incorporation into trichloroacetic acid precipitable material by scintillation counting.

Gel Electrophoresis and Immunoblotting Electrophoresis was performed on 12% polyacrylamide gels containing SDS (Laemmli, Nature, 227:680-685, 1970) unless otherwise stated.

Immunoblotting was performed by electroblotting the proteins to a nitrocellulose membrane and incubating the membrane in 50 mM Tris-HCI, pH 7.4, 100 mM NaCI (TBS) with 5% non-fat dry milk at 25°C for 1 hour to block non-specific antibody binding. The blocking solution was removed and the antibody (15 pg/ml) added in TBS containing 0.5% non-fat dry milk and 1 pg/ml sodium azide and incubated overnight at 250C. The membranes were washed 5 times in TBS, 0.5% milk for minutes each wash and then incubated with alkaline phosphatase conjugated affinity purified rabbit anti-goat IgG (KPL, Gaithersburg, MD) at a 1:1000 dilution in TBS containing 0.5% milk at.250C for 1 hour. The filters were washed with TBS five times, 10 minutes each time, and the blot developed using an alkaline phosphatase substrate solution (0.1 M Tris-HCI, pH 9, 0.25 mg/ml nitro blue tetrazolium, 0.5 mg/ml bromo-4-chloro-3-indolyl phosphate).

Major Chemotactic and Mitogenic Activity is Produced by 36 kD Peptide and Not PDGF Peptides 10 In order to determine if the chemotactic and mitogenic activities observed in the partially purified media proteins were from molecules containing the PDGF A and B chain peptides or were the products of molecules which do not contain these sequences, biological assays were performed with serial dilutions of the affinity purified media proteins and serial dilutions of recombinant PDGF AA and Bo homodimers and the AB heterodimer. Sufficient quantities of the samples were prepared to perform the mitogenic and chemotactic assays and the immunoblots with aliquots of each dilution sample. The mitogenic activity of the HUVE affinity purified factors observed was comparable to the activity elicited by all three recombinant PDGF dimers. The chemotactic activity was comparable to the AB heterodimer, producing less response than the BB homodimer and greater response than the AA homodimer. When the biological activity of the samples was compared with immunoblots of equivalent amounts of the same samples, no A chain nor B chain molecules were detected in the test samples. These data demonstrate the major biological activity present in the anti-PDGF affinity purified fraction cannot be accounted for by PDGF A or B chain containing molecules and imply that the major PDGF-immunoreactive protein species present in these samples (the 36 kD peptide) is biologically active and does not contain amino acid sequences found in the amino and carboxy terminals of the PDGF A or B chain peptides.

EXAMPLE 3 RECEPTOR COMPETITION ASSAYS Assays were performed using confluent cultures of NIH 3T3 cells in 24 well plates (Costar) grown in DMEM, 10% fetal calf serum, 10 pg/ml Gentamicin. The growth media was removed and the cells washed twice with serum-free DMEM, 0.2 mg/ml BSA and the plates placed on ice for 30 minutes in serum-free DMEM, 0.2 mg/ml BSA. Test samples and controls were made up in serum-free DMEM, 0.2 mg/ml BSA containing 5-10 ng/ml of HUVE affinity purified proteins and a serial dilution of one of the recombinant PDGF isoforms in a concentration range of 300 ng/ml to 16 ng/ml. One milliliter aliquots of the samples were placed into wells of the 24 well S. plates and incubated on ice on a platform rocker for two hours. After the incubation period, the cells were washed three times for 10 minutes each on ice with PBS. The proteins bound to the surface of the cells were eluted with 5 ul of 1 N acetic acid for minutes. The acetic acid elution samples were lyophilized, resuspended in 1 5 I- 1 1 04 15 H C u n o n 1 2 polyac ry amide gels anid rimunooiotted to nitroceiiulose using the anti-PDGF antibody.

In order to substantiate the binding of the endothelial cell molecules to the PDGF cell surface receptors, competitive receptor binding assays were performed. Because immunoblots of the affinity purified HUVE cell secreted proteins indicated the presence of multiple PDGF immunoreactive molecules, 1 25 1-labeled PDGF competition assays could not be used since this would not indicate which molecules in this mixture were competing for binding of the labeled PDGF for the receptors on the target cells. Since the isoforms of PDGF and the major PDGF immunorelated protein secreted by HUVE cells are of different molecular weights, receptor binding competition was demonstrated on immunoblots. Direct binding of the anti-PDGF immunoreactive peptides to NIH 3T3 cells was demonstrated by incubating monolayers of the 3T3 fibroblasts with the anti-PDGF affinity purified proteins ng/ml) for 2 hours at 4 0 C. Bound peptides were released by washing of the cell layer with 1 N acetic acid and quantitated by immunoblot analysis using anti-PDGF IgG.

This data show that the 36 kD immunoreactive peptide binds to cell surface of NIH 3T3 cells. This binding can be competed by increasing concentrations of recombinant PDGF BB added to the binding media. These data suggest that the CTGF peptide binds to specific cell surface receptors on NIH 3T3 cells and that PDGF BB can compete with this binding.

RNA Isolation and Northern Blotting Total RNA was isolated from cells in monolayer culture cells. Lyophilized RNA was resuspended in gel loading buffer containing 50% formamide and heated at 95°C for two minutes before loading (20 pg per lane total RNA) onto 2.2 M formaldehyde, 1% agarose gels and run at 50 volts. Integrity of RNA was determined by ethidium bromide staining and visualization of 18S and 28S rRNA bands. After electrophoresis the RNA was transferred to nitrocellulose by blotting overnight with SSC buffer. The nitrocellulose was air dried and baked at 80°C for 2 hours in a vacuum oven. Hybridization was performed overnight at 46°C with the addition of 5 X 10 s CPM per ml of 3 P-labeled probe. Normally for Northern blots, the entire plasmid was labeled and used as a probe. Labeling was done with a random primer labeling kit from Boehringer Mannheim. After hybridization, membranes were washed twice in 2X SSC, 0.1% SDS for 15 minutes each at room temperature, once for 15 minutes in 0.1X SSC, 0.1% SDS, room temperature and a final 15 minutes wash in 0. IX US V. I SDS at 46C. Blots were V autoradigraphed IU -I70C o Kodak X-omat film.

EXAMPLE 4 LIBRARY SCREENING, CLONING, AND SEQUENCING Standard molecular biology techniques were used to subclone and purify the various DNA clones (Sambrook, et al., Molecular Cloning a Laboratory Manual, Second edition, Cold Spring Harbor Laboratory Press, Col. Spring Harbor, NY). Clone was picked from a lambda gtl 1 HUVE cell cDNA library by induction of the fusion proteins and screening with anti-PDGF antibody. Plaques picked were rescreened and positive clones replated at low titer and isolated.

The EcoR I insert from clone DB60 was cloned into the M13 phage vector and single-stranded DNA obtained for clones with the insert in opposite orientations.

These M13 clones were then sequenced by the dideoxy method using the Sequenase kit Biochemical) and 3 "S-dATP (duPont). Both strands of DNA for this clone were completely sequenced using primer extension and both GTP and ITP chemistry. Aliquots of the sequencing reactions were run on both 6% acrylamide (16 hours) and 8% acrylamide (6 hours) gels, vacuum dried and autoradiographed for at least 18 hours.

The cDNA fragment from clone DB60 was 3 2 P-CTP labeled and used to rescreen the HUVE cell cDNA lambda gtl 1 library. Several clones were picked and the largest, the 2100 bp clone designed DB60R32, was subcloned into Bluescript phagemid.

Subclones were made of Pst I, Kpn I, and Eco RI/Kpn I restriction fragments also in Bluescript. These subclones were sequenced by double-stranded plasmid

DNA

sequencing techniques using Sequenase as described above. The 1458 bp Eco RI/Kpn I clone containing the open reading frame was subcloned into M13 mp18 and M13 mp19 and both strands of DNA were completely sequenced using singlestranded DNA sequencing techniques with primer extension and both GTP and ITP 10 chemistry.

Cloning Expression and Sequencing of the cDNA for Connective Tissue Growth Factor In order to further characterize these PDGF related molecules, sufficient quantities of the Tr,F m, in of the CTGF protein for amino acid sequencing was needed. However, the low 15 concentrations of CTGF in the conditioned media of HUVE cell cultures and the costly and time consuming techniques involved in obtaining and culturing these cells made protein purification to homogeneity and amino acid sequencing impractical.

Therefore, the anti-PDGF antibody was used to screen an HUVE cell cDNA library made in the expression vector lambda gtl 1. Over 500,000 recombinant clones were screened. Several clones which gave strong signals with the anti-PDGF antibody in the screening process were purified and subcloned into the M13 phage vector and partial sequence data obtained by single-stranded DNA sequencing. A search of the GenBank DNA sequence data base indicated that two of the clones picked contained fragments of the PDGF B chain cDNA open reading frame sequence. One of these clones was similar to a 1.8 kb insert previously isolated by Collins, et al. (Nature, 316:748-750, 1985) using a c-sis cDNA probe. A third clone of 500 bp was completely sequenced and no match was found in a homology search of all nucleotide and amino acid sequences in GenBank (CEF 10 sequence was not available at that time). This clone was designated DB60. Anti-PDGF antibody binding to the fusion protein produced by the clone DB60 was completely blocked by the affinity purified proteins. A 32 P-labeled probe was made of DB60 and used on a Northern blot of 20 pg of total RNA isolated from HUVE cells. The blot indicated probe hybridization with an mRNA of 2.4 kilobases, which is a message of sufficient size to produce the proteins in the 38 kD molecular weight range seen on the immunoblots of the affinity purified proteins. The DB60 clone was used to rescreen the HUVE cell cDNA lambda gtl 1 library and the largest clone isolated contained a 2100 base pair insert designated DB60R32. A probe made with the 2100 bp Eco RI insert of clone DB60R32 also hybridized with a single 2.4 kb message in a Northern blot of total RNA from HUVE cells.

EXAMPLE IN VITRO TRANSCRIPTION AND TRANSLATION In vitro transcription reactions were done using the 2100 bp cDNA clone DB60R32 in the Bluescript KS vector. The plasmid was cut with Xho I which cuts the plasmid once in the multiple cloning site of the vector 3' to the cDNA insert. The T7 promoter site located 5' to the cDNA insert was used for transcription. The in vitro transcriptions were done with a kit supplied with the Bluescript vector (Stratagene).

In vitro translation reactions were done using nuclease treated rabbit reticulocyte lysate and 3S-cysteine in a cysteine-free amino acid mix for labeling of the peptide 15 (Promega). The reactions were done in a final volume of 50 ul containing 3Scysteine 1 mCi/ml (1200 Ci/mMole, DuPont), and serial dilutions of mRNA from the in vitro transcription reactions in concentrations ranging from 50 to 500 nanograms per reaction tube. The reactions were incubated at 300C for 60 minutes. Aliquots of the reactions were run on reduced or nonreduced 12% polyacrylamide electrophoresis gels, dried, and autoradiographed.

Bacterial expression of immunoreactive CTGF peptide was accomplished by subcloning clone DB60R32 into the Eco RI site of the pET 5 expression vector (Studier, et al., Ed. Academic Press, N.Y. Vol. 185, 60-89, 1990) in both sense and inverse orientations (as determined by restriction enzyme digest analysis). Cultures of E. coli HMS174 cells were grown in M9 media to an OD 600 of 0.7 and the media made 0.4 mM IPTG and incubation continued for 2 hours. The cells were pelleted, lysed, inclusion bodies removed by centrifugation and aliquots of the pellet extracts run on 12% polyacrylamide gels and immunoblotted using the anti-PDGF antibody.

The protein produced by clone DB60R32 in the sense orientation produced anti- PDGF immunoreactive peptides in the 36-39 kD MW range while the anti-sense control produced no immunoreactive peptides. The recombinant peptides produced in the E. Coli system completely blocked the anti-PDGF reaction with the CTGF peptides present in conditioned media.

Expression of CTGF in Xenopus For expression in Xenopus oocytes, mature X. laevis females were obtained from Nasco (Fort Atkinson, WI) and maintained at room temperature. Frogs were anesthetized by hypothermia and the ovarian tissue was surgically removed.

Ovarian tissue was minced and digested the 0.2% collagenase (Sigma Type II) in OR-2 without calcium (Wallace, et al., Exp. Zool., 184:321-334, 1973) for 2-3 hours.

Unblemished stage VI oocytes (Dumont, J. Morphol., 136:153-180, 1972), 1.3 mm 10 diameter, were then carefully selected and microinjected.

Stage VI oocytes (5-10 at a time) were placed on a hollowed plexiglass platform and drained of excess OR-2 solution. Approximately 50 nl of sample containing 10 ng of RNA was injected into the animal nole just above the oocyte equator using a Leitz system microinjector. Following injection, oocytes were returned to OR-2 buffer with 0.1% BSA and incubated for 24 hours at 25°C. Viable oocytes were then pooled and extracted by homogenization in 100 mm NaCI, 10 mm Tris pH 7.5 with ten strokes of a Dounce homogenizer (20 pl/oocyte). The homogenate was then mixed with an equal volume of freon to remove pigment and lipid and centrifuged at 10,000 rpm for seconds to separate the phases. The top aqueous phase was removed and tested for chemotactic activity using NIH 3T3 cells as described above.

Injection of Xenopus oocytes with 10 ng of RNA preparations derived by in in vitro transcription of the DB60 R32 clone resulted in the production of a fibroblast chemotactic activity. Control injected cells did not produce this activity. These results indicate that the open reading frame of the DB60 R32 clone encodes a protein with chemotactic activity for fibroblastic cells as does CTGF.

EXAMPLE6 SEQUENCE ANALYSIS OF CTGF The 2100 bp insert of clone DB60R32 was sequenced initially by subcloning of Pst I and Kpn I restriction fragments into Bluescript and using double-stranded dideoxy methods. This indicated an open reading frame of 1047 base pairs and oriented the insert to the larger cDNA. An Eco RI/Kpn I fragment containing the entire open reading frame was inserted into M13 mp18 and M13 mpl9 and both strands of the DNA were sequenced with single-stranded dideoxy methods by primer extension using both GTP and the GTP analog ITP. The cDNA nucleotide sequence of the 10 open reading frame encoded a 38,000 MW protein, confirming the cell-free translation results and matching the size of the immunopurified peptides. A new search of the GenBank data base revealed that this cDNA had a 50% nucleotide sequence homology with CEF-10 mRNA, one of the immediate early genes induced in v-src transformed chicken embryo fibroblasts (Simmons, et al., Proc. Natl. Acad.

Sci. USA, 0. 1178- 182, 1989). The translated cDNA for human CTGF and avian CEF-10 have a 45% overall homology and a 52% homology if the putative alternative splicing region is deleted. This region is between amino acids 171 (aspartic acid) and 199 (cysteine) in the CTGF sequence.

EXAMPLE 7 ANALYSIS OF CTGF PROMOTER REGION Cell cultures Human skin fibroblasts were grown from explants of skin biopsy specimens.

NIH/3T3 cells and Cos 7 cells were obtained from the American Type Culture Collection (ATCC, Rockville, MD) All cells were cultured in Dulbecco's modified eagle's medium (DMEM) contained 10% fetal calf serum (FCS) at 37°C in an atmosphere of 10% CO 2 and 90% air. Human skin fibroblasts were used prior to the sixth passage.

Growth factors TGF-P1 was a gift from Richard Assoian Of Miami). Recombinant PDGF BB was obtained from Chiron (Emeryville, Calif.). Purified murine EGF was purchased from Sigma (St. Louis, MO).

RNA isolation and Northern blotting Total RNA was isolated from cultured cells by acid guanidium thiocyanate-phenolchloroform extraction as reported previously (Chomczynski, et al., Birchem, 162: 156-159, 1987). Total RNA was electrophoresed on an 1.5% agarose/formaldehyde gel and transferred to nitrocellulose. The CTGF probe as 1.1kb fragment representing the CTGF open reading frame obtained by PCR reaction using specific primers H01 5'-CGGAATTCGCAGTGCCAACCATGACC-3' (SEQ ID NO:3) and H02 5'-CCGAATTCTTAATGTCTCTCACTCTC-3' (SEQ ID NO:4). Hybridizations were S. performed using 1x106 cpm/ml of these probes labeled with [a- 32 P]dCTP by using a Random Primer DNA Labeling Kit (Boehringer Mannheim Biochemicals, Indianapolis, Inc.). Autoradiography was performed at -70°C for 6 to 72 hours by using X-ray films and intensifying screens.

Isolation of aenomic clones and sequence analysis Genomic DNA was isolated from human skin fibroblasts as described previously (Sambrook, et Cold Spring Harbor Laboratory Press, 9:14-19, 1989.). Using 4pg of genomic DNA as a template, a fragment of the CTGF gene was amplified by PCR using primers H02 and H03 5'-CGGAATTCCTGGAAGACACGTTTGGC-3' (SEQ ID PCR products were digested with EcoR1 and subcloned into M13. Sequence analysis by the dideoxy chain termination method (Sanger, et al., Proc.

20 Natl.Acad.Sci.USA, 74: 5463-5467, 1977.) Using the Sequenase kit *U.S.

Biochemical Corp., Cleveland, Ohio) demonstrated 900bp fragment which had a 387bp intron in the middle portion. Using a Human Genomic Library int he Lambda FIXTM II vector (Stratagene, La Jolla, CA) we screened approximately 1x10 6 recombinant phages with 32 P-labeled 900bp genomic DNA fragment as probe and isolated 3 phage clones that contained the CTGF gene.

Luciferase reporter gene assays A fragment of the CTGF promoter containing nucleotides-823 to +74 from one of the human genomic clones was first cloned in the Sacl-Xhol cloning site of pGL2-Basic vector (Promega). This construct (PO) was used as a template for PCR and deletion mutants were made with specific primers as follows: P1 contained nucleotides from -638 to +74, P2 from -363 to+74, P3 from -276 to +74, and P4 from -128 to +74. All deletion fragments were sequenced to insure no mutations had been introduced in the promoter fragments. NIH/3T3 cells were transfected in a 6-well plate with LIPOFECTIN® reagent (GIBCO BRL) for 6 hours. Each transfection included 2 pg of pSV-P-Galactosidase vector (Promega). Cells were incubated in serum-free DMEM with ITSTM (Collaborative Biomedical Products) for 24 hours after transfection followed by the incubation with growth factors for 4 hours or 24 hours. Luciferase activity was measured by using Luciferase Assay System (Promega) and a scintillation counter (Beckman LS6000SC) using it in single photon monitor mode.

To normalize for differences in transfection efficiency P-galactosidase activity was measured using a chemiluminescent assay using Galacto-Light T M (TROPIX, Inc.).

Preparation of nuclear extracts Nuclear extracts were prepared as described by Abmayr and Workman (Current 10 Protocols in Molecular Biology, vol 2, ppl2.1.1-12.1.9, Ausubel, et al., Greene Publ., and Wiley Interscience, NY, NY. Briefly, cells were treated with hypotonic buffer HEPES pH 7.9, 1.5mM MgCI,, 10mM KCI, 0.2mM PMSF, homogenized with 10 strokes of a glass dounce homogenizer and nuclei were isolated by centrifugation at 3300 x g for 15 minutes. Nuclear proteins were extracted by suspending the nuclei in an equal volume of extraction buffer r(20mM HEPES pH7.9, 25% glycerol, 1.5mM MgCI 2 0.8M KCI, 0.2mM EDTA, 0.2mM PMSF and DTT). The extract was dialyzed against 20mM HEPES pH 7.9, 20% glycerol, 100mM KCI, 0.2mM EDTA, 0.2mM PMSF and 0.5mM DTT before use. Protein concentration was determined using the BCA protein assay regent (Pierce).

Gel mobility shift assays Fragments of the CTGF promoter were prepared by PCR or restriction endonuclease digestion of the promoter fragment. Double stranded oligonucleotides were prepared by annealing complementary single stranded oligonucleotides. All oligonucleotides and fragments were checked by electrophoresis in agarose gels or polyacrylamide gels. Radiolabeled fragments of the CTGF promoter were prepared by end-labeling with Klenow enzyme (Boehringer Manheim) and polynucleotide kinase (Boehringer Manheim). Labeled fragments were purified by electrophoresis in 2% agarose gels or 20% polyacrylamide gel before use in gel mobility shift assay. The binding reaction mixture contained lpg of nuclear extract protein in 20pl of 10mM HEPES pH 7.9, 5mM Tris, 50mM KCI, 0.1mM EDTA, 1 pg poly(dl-dC)"poly(dl-dC) (Phamacia), glycerol, 300pg/ml BSA, and 10,000 cpm 32 P labeled DNA probe. Unlabeled competitor DNA was added and incubated at 4 0 C for 2 hours prior to adding the labeled probe. The labeled probe was incubated for one hour at 4 0 C in the reaction mixture. Electrophoresis was performed using 5% polyacrylamide gel with Tris, 0.38M glycine and 2mM EDTA.

Methylation interference assay End-labeled fragments of double stranded oligonucleotides were prepared as described for the gel mobility shift assay. The oligonucleotides were methylated by dimethyl sulfate (Fisher Scientific) for 5 minutes at room temperature. DNA-protein binding and gel mobility shift assay were performed as described above using large amounts of labeled probe (100K cpm) and nuclear protein (20 pg). DNA from shifted and non-shifted bands was purified and cleaved with piperidine (Fisher Scientific), and the samples were electrophoresed on a polyacrylamide DNA sequencing gel.

The sequences of the shifted and non-shifted fragments were compared with the intact probe sequenced using the same methods.

EXAMPLE 8 PROLONGED INDUUCT IN OF I C F mRNA BY 15 SHORT TERM TGF-1 EXPOSURE Most immediate early genes, such as c-fos and c-myc, that are induced by growth factors exhibit a short burst of expression even though the growth factor remains present in the media. In contrast, CTGF transcripts remain at high levels for over 24 hours after activation of the cells with TGF-p (Igarashi, et al., Mol. Bio. Cell., 4: 637- 645, 1993). This example examines whether the long term elevation of CTGF transcripts was dependent on the continuous presence of TGF-3.

Confluent human skin fibroblasts were cultured in serum free DMEM supplemented by insulin, transferrin, and selenium (DMEM-ITS) for 24 hours prior to adding of TGF- 3. After 1 hour exposure to TGF-, cells were washed in PBS and replaced with DMEM-ITS followed by different periods of incubation. Specifically, confluent cultures of human skin fibroblasts were incubated with DMEM-ITS containing 5 pg/ml of insulin, 5 pg/ml of transferrin and 5 ng/ml of selenium for 24 hours prior to the addition of TGF-. After the treatment with 10 ng/ml of TGF-P for 1 hour, cells were washed with PBS and incubated with DMEM-ITS for indicated time periods.

Northern blot analysis revealed CTGF mRNA was strongly induced from 4 hours to hours after TGF-P removal (FIGURE 2A).

The ability of TGF- to induce the CTGF transcript in the presence of several protein synthesis inhibitors was examined. FIGURE 2B shows the effect of cycloheximide on induction of CTGF mRNA. Lane A and H are non-treated control cells at 4 hours and 24 hours, respectedly. Lane B, 4 hrs. Cycloheximide (CHX) (10 ug/ml); Lane C, 4 hrs TGF- present for 1 hour during hour 1 of 2 of cycloheximide exposure; Lane E, same as B with RNA prepared 24 hours after addition of cycloheximide; Lane f, 24 hours TGF-p (10ug/ml); Lane G, same as D with RNA prepared 24 hours after addition of cycloheximide and 22 hours after removal of TGF-P.

As shown in FIGURE 2B, a 1 hour stimulation by TGF- in the presence of cycloheximide was sufficient to induce CTGF mRNA 4 hours later as well as 24 hours later. Cycloheximide alone was able to increase CTGF mRNA 4 hours later, suggesting the possibility of mRNA stabilization as has been reported for cycloheximide induction of other transcripts such as c-fos and c-myc (Greenberg, et al., Nature (London), 311: 433-438, 1984; Kruijer, et al., Nature, 312: 711-716, 1984). However, a report by Edwards and Mahadevan (Edwards, and L.C. IVV,|i.. I I I I I L L V a a Luv L s L. I s. j X U Mahadevan, EMBO 11:2415-2424, 1992) indicated that the protein synthesis inhibitors cycloheximide and anisomycin, but not puromycin, could act to stimulate transciption of the c-fos and c-jun genes, therefore message stabilization is not the only possible mechanism of action for these compounds.

.9 The ability of anisomycin and puromycin to inhibit TGF-P induction of CTGF transcripts was compared with that of cycloheximide as to the ability to elevate CTGF transcripts. FIGURE 2C shows the effect of protein synthesis inhibitors on induction of CTGF mRNA. Cells were treated with puromycin or anisomycin for 4 hours. TGF-P was added 1 hour after the addition of protein synthesis inhibitor and cells were incubated for 3 hours prior to isolation of total RNA. CTGF transcripts were analyzed by northern blot.

Puromycin did not induce the CTGF mRNA at any of the concentrations tested up to 100g/ml, which is 10 fold higher than that needed to completely block protein synthesis in these cells. Even at this high concentration it had no effect on the ability of TGF- to induce the CTGF mRNA. In contrast, anisomycin did elevate CTGF transcripts (FIGURE 2C) as was seen with cycloheximide although TGF- treatment still raised the level of CTGF mRNA in the presence of anisomycin.

These findings are similar to those reported by Edwards and Mahadevan (Edwards, and L.C. Mahadevan., EMBO 1.1:2415-2424, 1992) where both c-fos and c-jun were induced by anisomycin or cycloheximide by themselves, but not by puromycin alone. These data strongly suggest TGF- directly regulates CTGF gene expression via a mechanism that is independent of protein synthesis and may be primarily acting at the level of transcription.

EXAMPLE 9 ISOLATION OF THE HUMAN CTGF GENE To elucidate the structure of the CTGF gene, a fragment of the CTGF gene was first obtained using PCR. Four micrograms of genomic DNA prepared from human skin fibroblasts was used as a template and oligonucleotides, H02 and H03, were used as primers. After 30 cycles of reaction, a 900bp fragment was recovered that was 390bp longer than predicted from the cDNA sequence. Nucleotide sequence analys o this fr,,agment,, (O revealed the presence of a 387bp intron in the middle portion of the fragment. Using H0900 as a probe, 3 phage clones were from the human genomic library that contained a 4.3kb Xbal fragment which represented the entire coding sequence of the CTGF gene and a large portion of the putative promoter region. As shown in FIGURE 1A, the CTGF gene has 5 exons and 4 introns. A TATA sequence is present 24 nucleotides upstream of the mRNA cap site, determined by oligonucleotide primer extension. The consensus sequence of a CArG box, which is the inner core of the serum response element (SRE) characterized by

CC(AIT)

6 GG, is present between nucleotide position -380 to -390. Other potential regulatory elements are also present including a CAT box, two Spl sites and two AP- 1 sites. Furthermore, the CTGF promoter has a NF-1 like site, (TGGN 6

GCCAA)

(SEQ ID NO:6), between positions -194 and -182, and TGF-p inhibitory element like sequence (GNNTTGGTGA) (SEQ ID NO:7) between positions -119 and -128. Both of these elements have single base differences from the reported consensus sequences (Edwards, and J.K. Heath, The hormonal control regulation of gene transcription, 16: pp 333-347) DNA sequence comparison showed that the human CTGF promoter has an 80% sequence identity to the murine fisp-12 promoter in the region 300 nucleotides 5' of the transcription start site (FIGURE 1B). Further upstream regions exhibit much less similarity in DNA sequence.

EXAMPLE STUDIES ON THE CTGF PROMOTER To test whether the 5' nontranslated region of CTGF gene functions as a TGF- 3 inducible promoter, a fusion gene was constructed containing the CTGF promoter (nucleotides -823 to +74; nucleotides 1 to 898; SEQ ID NO:1) and the coding region of the firefly luciferase gene in the vector pGL2-basic.

Luciferase activity was tested in a transient transfection assay using NIH/3T3 cells. This construct conferred a 15-30 fold induction of luciferase activity after 24-hour stimulation by TGF-3 compared with control cultures. As seen at the level of the CTGF mRNA, other growth factors such as PDGF, EGF and FGF stimulated only a 2-3 fold induction of luciferase activity under identical conditions (Table 1).

TABLE 1 CELL TYPE AND GROWTH FACTOR REGULATION OF THE CTGF PROMOTER RELATIVE FOLD INDUCTION OF LUCIFERASE ACTIVITY AFTER GROWVTH FACTOR TREATMENT ICELL TYPE TGF- PDGF FGF EGF CELL TYPE TGF-0 PDGF FGF EGF 0 2C NIH/3T3 25.7 2.9 3.3 1.4 HSF 9.2 2.4 3.1 2.2 VSMC 9.8 ND ND ND HBL 100 1.1 ND 1.3 1.4 HEP G2 1.3 ND 1.4 1.8 ND Not Determined HSF-Human foreskin fibroblasts (primary) VSMC-Fetal bovine aortic smooth muscle cells (primary) HBL100 Human breast epithelial cell line (non-tumorigenic) HEP G2 Human Hepatic epithelial cell line (non-tumorgenic) (A CTGF gene fragment extending from nucleotides position -823 to +74 was inserted in the pGL2-basic vector. Plasmids were transfected with lipofectin for 6 hours and cells were incubated in DMEM-ITS for 16 hours prior to the addition of growth factors. After a 24 hour incubation cell extracts were prepared and luciferase activity measured. Luciferase activities were normalized by measuring P-galactosidase activity expressed from a cotransfected lacZ expression vector, pSV-0-galactosidase vector and compared between growth factor treated cells and non-treated cells. These experiments were repeated 4 times with similar observations. A representative experiment is shown).

When this promoter fragment was cloned in the reverse orientation (+74 to -823).

only basal levels of luciferase activity were detected and this level was uneffected by TGF-p or other growth factor treatment of the cells. The same pattern of growth factor induction was observed when human skin fibroblasts were used instead of NIH/3T3 cells (Table TGF-0 did not induce luciferase activity in several epithelial cell lines (Table demonstrating that TGF- regulation of the CTGF gene is cell type specific. The lack of any response by the epithelial cells is not due to a lack of a TGF- response as the growth of these cells is inhibited by TGF- (10ng/ml). The induction of luciferase activity under the control of the CTGF promoter only required a brief exposure of the cells to TGF-p as a 1 hour treatment of the cells with TGFgives nearly the same fold induction at 4 and 24 hours as cells continuously exposed 10 to TGF- (Table These results confirm the data from the Northern blots described previously and demonstrate that transcriptional regulation plays a primary role in the control of CTGF gene expression by TGF-P.

9 TABLE 2 SHORT TERM TGF-B EXPOSURE STIMULATES LONG TERM CTGF PROMOTER ACTIVITY 1 Time of Assay of Luciferase Activity of Assay of Luciferase Activity Duration of TGF-p exposure 4 Hours 24 Hours Continuous 3.8 21 1 hour 3.5 19 'Fold induction of Luciferase activity determined as described in Table 1 legend and EXAMPLE 7. NIH/3T3 cells were used for these experiments.

EXAMPLE 11 IDENTIFICATION OF THE PROMOTER ELEMENT REQUIRED FOR TGF-6 INDUCTION To determine which region of the promoter sequence is responsible for the induction by TGF-p, deletion mutants of the CTGF promoter were constructed using PCR primers designed to delete the known transcription factor consensus elements.

Regions of the promoter beginning at the most 5' region and moving toward the transcription start site were systematically deleted (FIGURE 3A). Removal of the region of the promoter down to base -363 which included an AP1 site and the CArG box had no significant effect on the TGF-p induction of luciferase activity.

Approximately a 30% reduction was seen when the second AP-1 was deleted (-363 to -276) although the fold induction by TGF- was still high (20 fold). Removal of the NF-1 like site in the P4 construct (-276 to -128) eliminated the TGF- inducibility of the promoter suggesting that this region contained the TGF-B response element.

Taking advantage of two Bsml sites we deleted the nucleotides from -162 to -110 leaving the remaining portions of the promoter intact. This construct exhibited a complete loss of TGF-3 inducibility demonstrating that the sequence between S. 10 positions -162 and -128 is essential for the TGF-P induction of luciferase activity. This region contains the TGF-p inhibtory element (TIC) -like site and is bordered by the NF-1 like site that others have reported plays a role in TGF- regulation of a2(l) collagen gene expression (Oikarinen, A. Hatamochi, and B. De Crombrugghe., J. Biol. Chem., 262:11064-11070, 1987.) And type 1 plaminogen activator inhibitor 15 (PAl-1) gene expression (Riccio, et al., Mol. Cell Biol., 12:1846-1855, 1992.).

A fusion gene was constructed placing the nucleotides from positions -275 to -106 of the CTGF promoter upstream from an SV40 enhancerless promoter controlling a luciferase gene to determine whether this region of the promoter was sufficient to confer TGF-p inducibility (FIGURE 3B). The SV40 enhancerless promoter was not 20 regulated by TGF-P. However, the promoter containing the CTGF sequences -275 to -106 conferred a nearly 9 fold induction after TGF-p treatment. Inversion of the fragment resulted in a little stimulation of luciferase activity after TGF-p treatment.

These data confirm that sites in the CTGF promoter between nucleotides -275 and -106 can act as TGF- regulator elements.

A series of competitive gel shift and methlylation interference assays were performed to delineate the region of this potion of the CTGF promoter that was binding to nuclear proteins. Initially competitive gel shifts were used to delineate which region of the sequence between positions -205 to -109 was a target for protein binding. A diagram of the probe and the various competitor fragments is illustrated in (FIGURE The results of these studies demonstrate that any fragment that contained the NH3 region (-169 to -149) acted as a specific competitor for the labeled promoter fragment containing bases -204 to -109 (FIGURE This region is located between the NF-1 like and TIE like sites. Oligonucleotide fragments that contained only the TIE like region or the NF-1 like region without the NH3 region did not compete in the gel shift assay.

To further delineate the regulatory element, methylation interference assays were performed. A fragment of the promoter from positions -275 to 106 was used initially. The results of these studies indicate that neither the NF-1 like site of the TIE element appear to be interacting with any nuclear proteins present in either control or TGF-P treated cells confirming the gel shift competition data. However, a region between these sites from positions 157 to -145 (nucleotides 667 to 679; SEQ ID NO:1) contained several G ,o residues that were not methylated in the shifted bands suggesting that this region was the nuclear protein binding site (FIGURE 5A). A smaller fragment of the region (nucleotides 169 to 139) was then analyzed to give better resolution of the important G residues (FIGURE 5B). The data from this analysis confirmed that of the larger fragment and map G residues that lie within the sequence determined by competition gel shifts.

To better characterize the actual TGF- reactive site, the ability of the intact sequence and several deletions to compete for protein binding was compared in the gel shift assay (FIGURE These data confirm the results of the methlyation interference assays and suggest that the region of the promoter from positions -159 20 to -143 contains at least a portion of the cis regulator element involved in TGF-0 regulation of CTGF gene expression.

Point mutations were made in the region of the sequence believed to be involved in the TGF- induction and tested these promoters in our luciferase reporter construct (FIGURE Two point mutations were tested and both reduced the inducibility of the gene by TGF-: One mutation reduced the induction by 25% from control and the other by 80%. Neither had any effect on basal level of expression compared to control native sequence.

Point mutations were constructed by synthesis of oligonucleotides containing the desired base change and taking advantage of the two Bsml sites in the CTGF promoter. All constructs were confirmed by nucleotide sequence analysis to demonstrate that only the desired base change occurred and that all of the other nucleotide sequence was identical to the normal promoter. Assays were performed as described above for other CTGF promoter-luciferase constructs using NIH/3T3 cells as targets. The data presented in the Table in FIGURE 7 is from a single experiment with duplicate assays for each experimental condition. The experiment was run several times to confirm the results. These data demonstrate that a single mutation in this region of the promoter can reduce the TGF- induction by 85%, to less than 15% of the normal gene. These data demonstrate that the sequence identified is essential for the TGF-0 induction of the CTGF gene.

EXAMPLE 12 TGF-B STIMULATES ANCHORAGE INDEPENDENT GROWTH VIA A CTGF DEPENDENT PATHWAY a. Inhibition of TGF-B induced CTGF gene expression by elevation of cAMP 10 levels Both herbimycin and phorbol esters were utilized to determine if either tyrosine kinases or protein kinase C had any role in the regulation of CTGF gene expression induced by TGF-. Thaese studies wAere performred using the CTGF promoter (-823 to +74) luciferase reporter construct transfected into NIH/3T3 cells.

15 NIH/3T3 cells were grown to 50% confluence in DMEM/10% FCS. They were all transfected with PO CTGF promoter (nucleotides position -823 to +74) driving the expression of the pGL2 basic vector firefly luciferase using LIPOFECTIN® as described above in EXAMPLE 7. After 24 hours in DMEM/ITS media the inhibitors were added. All of the agents were added to the cultures 2 hours prior to the addition of 10 ng/ml TGF-. The cells were incubated 24 hours and the luciferase activity determined using the Tropix luciferase assay kit and a Beckman scintillation counter equipped with a single photon monitor. In a related experiment PMA was added to the cells for 24 hours prior to TGF-0 to deplete protein kinase C. This also had no effect on the ability of TGF-p to induce luciferase activity under the control of the CTGF promoter. Also, as a control experiment for the herbimycin studies, the activity of this agent to inhibit PDGF induced cell division was examined. Confluent density arrested monolayers of NIH/3T3 cells were treated with the indicated concentrations of herbimycin for 2 hours prior to addition of recombinant PDGF BB.

The number of cells was determined by trypsinization and counting 24 hours after the addition of PDGF. The mitotic index represents the percent of cells that underwent mitosis.

46.

Neither of these compounds had any effect on the ability of TGF-0 to induce CTGF gene expression, nor did they modulate the basal level of CTGF gene expression in the target cells. However, both cholera toxin or 8Br-cAMP were potent inhibitors of the TGF- induction of the CTGF gene (FIGURE 8A).

These data indicate that neither tyrosine kinases or protein kinase C is part of the signal transduction pathway leading to CTGF gene induction controlled by TGF-0.

Also, cyclic nucleotide regulated proteins do not appear to be a part of the TGFpathway for regulation of CTGF gene expression. However, elevation of cAMP levels in the cell abolishes the TGF- induction of CTGF gene expression. In a related 10 experiment we find that the cAMP or cholera toxin can be added up 8 hours after addition of TGF-0 and it is still effective in blocking the expression of the CTGF gene.

This suggests that the action of the cAMP is distal from the receptor and may be effecting transcription factor binding to the CTGF promoter.

Sb. cAMP does not block all of the actions of the TGF-1 on fibroblastic cells 15 The four panels shown in FIGURE 8B are photomicrographs of the NIH/3T3 cells used in the above experiments which were Control) No Additons; TGF-) TGFcAMP) 8Br cAMP (1000 uM); cAMP TGF-) 8Br cAMP (1000 uM) and TGF- (10ng/ml) prior to determination of luciferase activity. These data indicate that Swhile cAMP causes dramatic changes in the morphological appearance of the NIH/3T3 cells, TGF- addition to these cells induces a morphological appearance in these cells which was similar, if not identical, to control cells treated with TGF-0.

Thus, although cAMP can block TGF- induction of CTGF gene expression it has no effect on the biochemical events which regulate the observed changes in morphology seen in these monolayer cultures. These results demonstrate that there are multiple components in the action of TGF- on fibroblastic cells which can be differentially blocked by cAMP. No significant difference was detected in the culture with respect to total cellular protein content or expression of an SV40/-galactosidase control reporter gene indicating that the changes were not due to toxic effects of the cAMP.

Cholera toxin treatment induced a morphology similar to that seen in the 8Br cAMP treated cells which was reversed by addtion of TGF-.

c. Inhibition of TGF-3 induced anchorage independent growth by cAMP and its reversal by rCTGF Because of the results of the previous studies, experiments were performed to determine whether cANP would block TGF-0 induced anchorage independent growth. Initially the effects of 8Br CAMP. 8Br cGMP and cholera toxin on the ability of TGF-p to induce anchorage independent growth of NRK cells was examined. Anchorage independent growth assays were performed essentially as described by Guadagna and Assoian Cell Biol, 115: 1419- 1425, 1991). Briefly NRK cells normally maintained as monolayer cultures were plated on an agarose layer in DMEM10% FCS containing 5 ng/ml EGF.

TGF-0 or CTGF was added and the cells incubated for 72 hours. DNA synthesis is then determined by labeling for 24 hours with 3 H-thymindine S. (2uCi/ml) the cells harvested and processed by TCA precipitation etc.

Inhibitors were added at the same time as the growth factors and remained present for the duration of the experiment (FIGURE 8C). (Abbreviations: Cholera toxin (CTX)).

As seen in FIGURE 8C both 88r cAMP and cholera toxin were effective inhibitors of growth in this assay while 8Er cGMP had no effect at concentrations up to 10 mM.

Because expression of the CTGF gene was blocked by elevation of cAMP levels in the cells, an experiment was performed to determine whether rCTGF could overcome the inhibition. As seen in the left panel in FIGURE 8B addition of rCTGF to NRK cells does not stimulate anchorage independent growth and therefore does not substitute for TGF-. However, addition of the same amounts of rCTGF to cells treated with TGF-P and inhibited with either 8Br cAMP or cholera toxin overcomes the inhibition and allows the cells to grow at a rate comparable to those treated with TGF-0 in the absence of cAMP or cholera toxin (far right panel). These studies suggest a direct link between the production of CTGF and the ability of NRK cells to grow in suspension. They also demonstrate that while TGF-0 can induce certain effects in fibroblasts in the presence of elevated levels of cAMP they are not suffic:ent to allow for anchorage independent growth. Also. since CTGF alone is nct 3C sufficient to stimulate this biological resconse it is not a substitute for all of TGF-3's acticns on fibrcblasts. These results demonstrate there are both CTGF decendert and CTGF independent effects induced by TGF-3 in tarcet cells (NRK) that ac: syrercgstically tc ailcw for a specific cellular response (anchcrace indecende t crcwth, 48.

EXAMPLE 13 INHIBITION OF TGF- INDUCED GRANULATION TISSUE FORMATION

BY

AGENTS THAT ELEVATE cAMP LEVELS TGF-p has been shown to induce fibrosis in several animal model studies.

For example, one group injected 400 to 800 ng of TGF-3 into the subdermal space in the back of neonatal mice. When the TGF-p is injected once a day for three days in a row, a large fibrotic tissue forms (Roberts, et al., Proc. Natl.

Acad. Sci. USA, 83:4167, 1986). The present example shows comparative studies with TGF-0 and CTGF and the results showed that CTGF induced the formation of connective tissue which is very similar, if not identical to that formed in response to TGF-p. Other growth factors such as PDGF or EGF do not induce tissue similar to TGF-p, indicating that CTGF may be responsible for the formation of the tissue induced by TGF-0 injection.

Because the results in Example 12 showed that cAMP levels could block the induction of CTGF in the cultured cells, it was of interest to determine whether elevation of cAMP levels in cells in an animal could block the action of TGF-p in vivo.

Using the injection model described above and in Roberts, et al., the following experiment was performed. Neonatal mice were injected once a day for three days in a row with either: TGF- (400 ng); cholera toxin (100 ng); TGF- (400 ng) and cholera toxin (100 ng); or saline. Three mice were used in each group. After injected tissue was prepared using standard histological methods, the area of injection was examined by light microscopy after staining with hematoxylin and eosin.

As expected, saline injections had no effect on the type of tissue present in the murine skin and TGF-3 injections induced a large amount of new connective tissue which resembled granulation tissue. This tissue contained increased numbers of fibroblasts and increased amounts of collagen and other matrix components.

Injection of cholera toxin alone caused no stimulation of granulation tissue formation.

Co-injection of TGF- and cholera toxin also showed no formation of granulation 3C tissue demonstrating that the cholera toxin blocked the TGF-0 induced formation of granulation tissue. These results indicate the theraoeutic utility of agents that block the production or ac:ion of CTGF for use as anti-fibrotic drugs.

SEQUENCE LISTING <110> UNIVERSITY OF SOUTH FLORIDA GROTENDORST, Gary R.

BRADHAM, Douglass M.

<120> CONNECTIVE TISSUE GROWTH FACTOR <130> USF1100AU-8A <140> AU 53667/00 <141> 1996-05-31 <150> PCT/US 96/08140 <151> 1996-05-31 <150> US 08/459,717 <151> 1995-06-02 <160> 13 <170> PatentIn version 3.1 1 r r <210> <211> <212> <213> <220> <221> <222> <223> <220> <221> <222> <223> <220> <221> <222> <223> <220> <221> <222> <223> <220> <221> 50 <222> <223> <220> <221> 55 <222> <223>

CDS

(1025) (1090) Intron (1091). .(1204)

CDS

(1205)..(1426) Intron (1427)..(1652) 1 4214

DNA

Homo sapiens

C

a a. a

C

C

C,

CDS

(1653)..(1904) Intron (1905)..(2033) <220> <221> CDS <222> (2034)..(2246) <223> <220> <221> Intron <222> (2247)..(2633) <223> <220> <221> CDS <222> (2634)..(2930) <223> <400> 1 tctagagctc gcgcgagctc ctggaaacat tgatggccac 120 taagagaaaa ctaagcaaga 180 acqagtcttt gttctctttc 240 300 gcaactcact ccttttctac 360 aatcattqct aagggttggg 420 ttgcctcttc agctacctac 480 acttattcga aaaagaaata 540 gagtggtgcg aagaggatag 600 660 50 tgctgagtgt caaggggtca 720 aggaatgcga ggaatgtccc 780 gccgcccgga gcgtataaaa 840 S. S. S S S. S S S

S.

taatacgact tcgtcccttg gttttggaaa ttgtcccaaa ttutacdy L tctttggaga ggggagaaac ttcctaaaaa agaaataatt qaaaaaaaaa tctgtgagct ggatcaatcc tgtttgtgta gcctcgggcc cactataggg tccttqccta tctgccccag accgttacct aggcatcttq gtttcaagag cttttcgaat ggatgtatgt gccagtgtgt ttctatttgg ggagtgtgcc ggtgtgagtt ggactccatt gcccgcccca cgtcgactcg tataaaactc gagactgcat caagtgacaa aggatttcaa cctatagcct tttttaggaa cagtggacag ttataaatga tgctggaaat agctttttca gatgaggcag cagctcattg aactcacaca atcccttttt ctacatatat cctgagtcac atgatcaaat atggttaaaa ctaaaacgca ttcctgctgt aacagggcaa tatgaatcag actgcgcttt gacggaggaa gaaggtgggg gcgagccgcg acaactcttc 51 occgctgaga ggagacagoo agtgogactc oacotccag ctogacggca gccgcccgg 900 ccgacagcco cgagacgaca gcoggcgcg tcooggtocc oaoctocgac caocgccago 960 gctocaggcc oogcgctccc cgctcgocgc caccgcgooc tccgotcogo ccgoagtgoc 1020 aacc atg acc goc gcc agt atg ggc coo gtc cgc gtc goc ttc gtg gtc 1069 Met Thr Ala Ala Ser Met Gly Pro Val Arg Val Ala Phe Val Val 1 5 10 otc ctc goc ctc tgc agc cgg gtaagcgccg ggagccooog ctgcggoogg 1120 Leu Leu Ala Leu Cys Ser Arg cggctgccag ggagggactc ggggccggcc ggggagggcg tgcgcgccga ccgagcgccg 1180 ctgaocgcco tgtcotccot gcag cog goc gtc ggc cag aac tgc ago ggg 1231 Pro Ala Val Gly Gin Asn Cys Ser Gly ocg tgc cgg tgc ccg gac gag ccg gcg cog cgc tgo ccg gcg ggc gtg 129 Pro Cys Arg Cys Pro Asp Glu Pro Ala Pro Arg Cys Pro Ala Gly Val 40 agc ctc gtg otg gac ggc tgc ggc tgc tgc cgc gtc tgc goc aag cag 1327 Ser Leu Val Leu Asp Gly Cys Gly Cys Cys Arg Val Cys Ala Lys Gin 55 c tg ggc gag ctg tgc acc gag cgc gac ccc tgc gac ccg cac aag ggc 1375 Leu Gly Glu Leu Cys Thr Glu Arg Asp Pro Cys Asp Pro His Lys Gly 70 ctc ttc tgt gao ttc ggc too cog goo aao cgc aag ato ggo gtg tgo 1423 Leu Phe Cys Asp Phe Gly Ser Pro Ala Asn Arg Lys Ile Gly Val Cys 85 90 aco ggtaagacco goagococca cogotaggtg tocggcogoo tootcootca 1476 Thr ogoocaccog ooogctggaa aaagaaaccg ctcggactga gtttctttct coagctgctg 1536 52 ccagcccgcc ccctgcagcc cagatcccaa ctcgcatccc tgacgctctg gatgtgagag 1596 tgccccaatg cctgacctct gcatccccca cccctctctt cccttcctct tctcca gcc 1655 Al a aaa gat ggt gct ccc tgc atc ttc ggt ggt acg 1703 Lys Asp Gly Ala Pro Cys Ile Phe Gly Gly Thr 100 105 gag tcc ttc cag agc agc tgc aag tac cag tgc 1751 Glu Ser Phe Gin Ser Ser Cys Lys Tyr Gin Cys 115 120 gcg gtg ggc tgc atg ccc ctg tgc agc atg gac 1799 Ala Val Gly Cys Met Pro Leu Cys Ser Met Asp 130 135 140 cct gac tgc ccc ttc ccg agg agg gtc aag ctg 1847 Pro Asp Cys Pro Phe Pro Arg Arg Val Lys Leu 1150 155 gag gag tgg gtg tgt gac gag ccc aag gau caa 1895 Giu Glu Trp Vai Cys Asp Giu Pro Lys Asp Gln 165 170 gcc ctc gcg ggtgagtcga gtcttcctct aagtcagggl 1944 Ala Leu Aia 180 tcccagggag ggagtcctaa ctgtgccgac cgaacgggga 2004 acatggtgtt tgtgtgctct gctctcgca gct tac cga 2057 Ala Tyr Arg ggc cca gac cca act atg att aga gcc aac tgc 2105 Giy Pro Asp Pro Thr Met Ile Arg Ala Asn Cys 50 190 195 gag tgg agc gcc tgt tcc aag acc tgt ggg atg 2153 Giu Trp Ser Ala Cys Ser Lys Thr Cys Gly Met 55 205 210 215 gtg tac cgc Val Tyr Arg 110 acg tgc ctg Thr Cys Leu 125 gtt cgt ctg Val Arg Leu ccc ggg aaa Pro Gly Lys acc gtg gtt Thr Vai Val 1175 t cgtgattctc agc Ser ga c Asp ccc Pro tgc Cys 160 ggg Gly gga Gi y ggg Gi y agc Ser 145 tgc Cys cct Pro

S

S

S

0e

S

aataccttat caggcgtttt ctg gaa gac acg ttt Leu Glu Asp Thr Phe 185 ctg gtc cag acc aca Leu Val Gin Thr Thr 200 ggc atc tcc acc cgg Gly Ile Ser Thr Arg 220 gtt aco aat 2201 Val Thr Asn tgo atg gtc 2246 Cys Met Val gtacatgtto 2306 tagggctott 2366 gotgttttgo 2426 ttooacaggg 2486 goaaatgaga 2546 taaaacaoag 2606 53 gac aac gcc tcc tgc agg cta gag Asp Asn Ala Ser Cys Arg Leu Giu 225 230 agg cct tgo gaa gct gac ctg gaa Arg Pro Cys Giu Ala Asp Leu Giu 240 245 tgctcotatt aactattttt cacaggaaaa gcacgcttgt tagtataagc ccgttatctc tggaatgaga gcttgtgtaa tagcaaccac ttagttaatt caagacattc oaagagaggc ctcaaaottc ctcccctoaa aatataaaca agggttgaag aaagooaotc ctcttgtaga aag cag agc Lys Gin Sei gag aac att Giu Asn Ile acagtggata caaaactatc oagttttcca tctggctatt gaagtcagac gtcgctgatt cgc ctg Arg Leu 235 -aag Lys ggacccaact taaccattga ctacgaaatc tttggacata aacagaagac tttttttttc ctotctcttt 2660 tcccttgtot

S

S

S.

aaa atc 2708 Lys Ile aag aca 40 2756 Lys Thr tgc ac 2804 Cys Thr gao ggc 50 2852 Asp Gly 310 tgc oat 55 2900 Cys His 325 too Ser tao Tyr 000 Pro 295 gag Giu tao Tyr oot Pro 265 got Aila aga Arg atg Met tgt Cys toottag aag ggo aaa aag tgo ato ogt act 000 Lys Giy Lys Lys Cys Ile Arg Thr Pro 255 260 :0 aag ttt gag ott tot ggo tgc aoc ago atg .e Lys Phe Giu Leu Ser Giy Cys Thr Ser Met 270 275 La tto tgt gga gta tgt aoo gao ggo oga tgo rs Phe Cys Gly Val Cys Thr Asp Giy Arg Cys 285 290 :c aoo aoo otg oog gtg gag tto aag tgo cot Lr Thr Thr Leu Pro Vai Giu Phe Lys Cys Pro 300 305 Lg aag aao atg atg tto ato aaq aoo tgt goo rs Lys Asn Met Met Phe Ile Lys Thr Cys Ala 315 320 ,o gga gao aat gao ato ttt gaa tog otg tao o Giy Asp Asn Asp Ile Phe Giu Ser Leu Tyr 0 335 340 54 tac agg aag atg tac gga gac atg gca tga agccagagag tgagagacat 2950 Tyr Arg Lys Met Tyr Gly Asp Met Ala 345 taactcatta gactggaact tgaactgatt 3010 aqtagcacaa 3070 aaaacattgt 3130 ttaagacttg 3190 ctttaggaqc 3250 gtaatatgcc 3310 tgcctgtagc 3370 aqttgttcct 3430 ttcaggaatc 3490 aacaagccag 3550 atatatatat 3610 ttgtttttaa 3670 tgtaaagctt 3730 gatagaatga 3790 aggctgattt 3850 aaaactgagt 3910 gatatgactg 55 3970 gttatttaaa gccatgtcaa acagtggaac agtqggaggg tgctatttga cccagtgaca taagtcagaa ggaatcctgt attttttaaa atatgtacag tgctttgata gtctgatcgt cagtccgtca ctaqgtagga gactctatat tttttcgaca tctgtttttc acaaatagtc tacattagta taccggcccg agtgtaattg gctaggatgt cagcagactc cgattagact atttatattg ttatctaagt tttcaatgtt tcaaagcatg aaacagattg aatgtggtag agctgatcag gtttatttgt cacatctcat taactggggg tatcttcccc cacagcacca gttagtatca agaaggaaaa gcattctcca agctctgaca ggacagcttg taaatattgt taatttaaag a gcc tca at t aaatggatac tttgcaaagg ctcacgttta tttttcacct tgagagtgtg ttttccgtaa aaaagattcc agacactggt gaatgtatat tcagatcgac ttttagcgtg gccatcaaga ttctgattcg tggcaagtga gtgtgtgtgt ttgtttgtgc tctgaacacc ttatatggaa ggaggcatca atgaacaaat gaagcatttg accaaaagtt aaatgatttc cacccaattc ttgaagaatg taaggtgtgg tcttatacga ctcactgacc gactgagtca aatgacactg atttgcctgt gtgtgtgtat ctttttattt ataggtagaa attctgctca gtgtcttggc ggccttatta tttctacttt acatgtttgc 0e S S

S

S

S

5* S Se

S

SSCS

acctttctag ttgaaaataa agtgtatatt ttttctataa agggcttggt tattcattta 4030 tccttctaaa catttctgag ttttcttgag cataaatagg aagttcttat taatcataag 4090 ataattcacc aataattttc taaatatctt taattattct atacattaat aaattgatta 4150 ttccatagaa tttttatgta aacatacttc acactgaatc aagtatcaca gacttgcagg 4210 cat a 4214 <210> 2 <211> 349 <212> PRT <213> Homo sapiens <400> 2 Met Thr Ala Ala Ser Met Gly Pro Val Arg Val Ala Phe Val Val Leu 1 5 10 Leu Ala Leu Cys Ser Arg Pro Ala Val Gly Gin Asn Cys Ser Gly Pro 2530 Cys Arg Cys Pro Asp Glu Pro Ala Pro Arg Cys Pro Ala Gly Val Ser 40 Leu Val Leu Asp Gly Cys Gly Cys Cys Arg Val Cys Ala Lys Gin Leu 55 Gly Glu Leu Cys Thr Glu Arg Asp Pro Cys Asp Pro His Lys Gly Leu 70 75 Phe Cys Asp Phe Gly Ser Pro Ala Asn Arg Lys Ile Gly Val Cys Thr 85 90 Ala Lys Asp Gly Ala Pro Cys Ile Phe Gly Gly Thr Val Tyr Arg Ser 100 105 110 Gly Glu Ser Phe Gin Ser Ser Cys Lys Tyr Gin Cys Thr Cys Leu Asp :115 120 125 5555 Ala Val Gly Cys Met Pro Leu Cys Ser Met Asp Val Arg Leu Pro *130 135 140 Ser 145 Pro Asp Cys Pro Phe 150 Pro Arg Arg Val Leu Pro Gly Lys Cys Glu Giu Trp Cys Asp Giu Pro Lys 170 Asp Gin Thr Val Val Gly Pro Ala Leu Thr Met Ile 195 Al a 180 Ala Tyr Arg Leu Asp Thr Phe Gly Pro Asp Pro 190 Trp Ser Ala Arg Ala Asn Cys Leu 200 Val Gin Thr Thr Glu 205 Cys Ser 210 Lys Thr Cys Gly Met 215 Gly Ile Ser Thr Val Thr Asn Asp Ala Ser Cys Arg Giu Lys Gin Ser Leu Cys Met Vai Arg 240 Pro Cys Glu Ala Asp 245 Leu Giu Giu Asn Lys Lys Giy Lys Lys Cys 255 T1P Arg Thr Cys Thr Ser 275 Lys Ile Ser Lys Pro 265 le Lys Phe Giu Leu Ser Gily 270 Val Cys Thr Met Lys Thr Tyr Arg 280 Ala Lys Phe Cys Gi y 285

A

Asp Gly 290 Arg Cys Cys Thr Pro 295 His Arg Thr Thr Leu Pro Val Giu Phe 305 Lys Cys Pro Asp Giu Val Met Lys Lys 315 Asn Met Met Phe Ile 320 Lys Thr Cys Ala Cys 325 His Tyr Asn Cys Gly Asp Asn Asp Ile Phe 335 Giu Ser Leu Tyr Arq Lys Met Tyr 345 Gly Asp Met Ala <210> 3 <211> 26 55 <212> DNA <213> Artificial sequence <220> <223> PCR primer H01 <400> 3 cggaattcgc agtgccaacc atgacc 26 <210> <211> <212> <213> <220> <223> 4 26

DNA

Artificial sequence PCR primer H02 <400> 4 ccgaattctt 26 aatgtctctc actctc <210> <211> 26 <212> DNA <213> Artificial sequence <220> <223> PCR primer H03 <400> cqgaattcct ggaagacacg tttggc 26

S.

S S

*SSS

S. S* S S S S

S.

S S

S

55 S S

S

S

S.

S S 5555 5.55

S

S. S S S

S.

SaSS

S

<210> <211> <212> <213> 40 <220> <223> <220> <221> <222> <223> 6 14

DNA

Artificial sequence NF-1 like site misc feature (9) n is any nucleotide <400> 6 tggnnnnnng ccaa 50 14 <210> <211> 55 <212> <213> 7

DNA

Artificial sequence <220> <223> TGF-beta inhibitory element-like sequence <220> <221> misc feature <222> <223> n is any nucleotide <400> 7 gnnttggtga <210> 8 <211> 13 <212> DNA <213> Homo sapiens <400> 8 gtgtcaaggg gtc 13 <210> 9 <211> 838 <212> DNA <213> Mus musculus <400> 9 tctttcttct cccactatat tccctgacac ttaggcttct gaagatagcc aactcataaa cttatttttc tagaaaacca tgcccagtca taccccttgc 120 cctgaagaca agttcttaca taaagagtgc tgaaaatctt cctgggaacc 180 gctttcatat ctttcagcca tcaaaatggc catctcagtq accaaagatc 40 240 tttcagata c aaaagttgca cataggaatt ctgggaggaq agqaggcatt 300 ataagcaccc ttctcctctc agtagaagaa caccaagaga ctacagcccc 360 aaaaaaaaaa atccaaaaca aagaaaaaga aatatttttt ttaatttcta 420 gtatttgcct cttgagctat ttgagtcttg agaagttttt atgtcagtag 480 caaagagatt tttaagaaga aaagatcaga gaaataatcg tttatttcta 55 540 atttggtctg ctgcctggac tacatccttq aatgcctgta tcaaatggct gtaaagaaaa ggggcccatg ccagaactgg agttatattt 59 catcaggagg ggtgagaaga cgatatggag aaagttttac t 600 acacagcgcc tttttttttt ttttcctggc gagctaaagt g 660 aggaatgtgg agtgtcaagg ggtcaggatc aatccggtgt g 720 tggggaggaa tgtgaggaat gtccctgttt gtgtaggact t 780 ccggctcccg ggagcgtata aaagccagcg ccgcccgcct a 838 <210> <211> 13 <212> DNA <213> Artificial sequence <220> <223> TGF-beta responsive/regulatory element <400> gtgtcaaggt gtc 13 <210> 11 <211> 13 <212> DNA <213> Artificial sequence <220> <223> TGF-beta responsive/regulatory element <400> 11 gtgttaaggg gtc 13 <210> 12 <211> 18 <212> DNA <213> Homo sapiens <400> 12 gagtgtcaag gggtcagg 50 18 <210> 13 <211> 36 55 <212> DNA <213> Homo sapiens tcttggtgt tgtgctggaa tgccagctt tttcagacgg agttgatga ggcaggaagg cattcagtt ctttggcgag gtctcacac agctcttc 0 a 0 0 0 9 9 *060 9*9 0 9. 9.

0. 0 0 9 00.0 0000 <400> 13 gaggaatgct gagtgtcaag gggtcaggat caatcc 36 *6 0 6* ~0 '1 000S .6 00 6066 66 06 eS 6 66 0~ 6 S *06 S 0 6 66..

6 j** 66 ~s S S 0655 6S S 60

OSJS

0 6500

Claims (18)

1. A method of diagnosing a pathological state in a subject suspected of having a pathology selected from pulmonary fibrosis, kidney fibrosis, tumor formation or growth, or glaucoma, which is characterized by a cell proliferative disorder associated with connective tissue growth factor (CTGF), the method comprising; obtaining a sample suspected of containing CTGF from the subject; determining the level of CTGF in the sample; and comparing the level of CTGF in the sample to the level of CTGF in a normal standard sample.

2. The method of claim 1, wherein determining the level of CTGF in the sample comprises using an antibody, or an antigen binding fragment thereof, that is specifically reactive with CTGF or a fragment thereof

3. The method of claim 1, wherein determining the level of CTGF in the sample comprises using an assay selected from a radioimmunoassay, an enzyme-linked immunosorption assay, and an immunofluorescence assay.

4. The method of claim 1, wherein determining the level of CTGF in the sample comprises using a nucleic acid probe that specifically hybridizes to a nucleic acid molecule encoding CTGF. A method of diagnosing a pathological state in a subject suspected of having pathology characterized by a cell proliferative disorder associated with regulation of connective tissue growth factor (CTGF) gene expression from a transforming growth factor-3 (TGF-3) regulatory element (TORE), said T3RE comprising the nucleotide sequence 5'-GTGTCAAGGGGTC-3' (SEQ ID NO:8), comprising; obtaining a sample suspected of containing a CTGF nucleic acid molecule from the subject; 0Z determining the structure or level of expression of the CTGF nucleic acid molecule in the sample, wherein the structure or level of expression of the CTGF nucleic acid molecule is indicative of CTGF gene expression from the T3RE; and comparing the structure or level of expression of the CTGF nucleic acid molecule in the sample to the structure or level of expression of the CTGF nucleic acid molecule in a normal standard sample, wherein a difference in the structure of level of expression of the CTGF nucleic acid molecule in the sample as compared to the CTGF nucleic acid molecule in a 35 normal standard sample is indicative of altered CTGF expression from the TORE, thereby diagnosing a pathological state in the subject.

6. The method of claim 5, wherein the pathology is selected from the group consisting of fibrotic disease and atherosclerosis.

7. The method of claim 5, wherein the pathology is selected from pulmonary fibrosis, kidney fibrosis, tumor formation or growth, or glaucoma.

8. The method of claim 5, wherein the cell proliferative disorder is selected from scleroderma, arthritis, cirrhosis, keloid and hypertrophic scar.

9. The method of claim 5, wherein the cell proliferative disorder is associated with overgrowth of cells. The method of claim 9, wherein the cells are selected from endothelial cells and connective tissue cells.

11. The method of claim 5, wherein the CTGF nucleic acid molecule is a CTGF ribonucleic acid (RNA), said method comprising determining the level of expression of the CTGF RNA.

12. The method of claim 11, wherein the CTGF RNA is messenger RNA.

13. The method of claim 11, wherein the sample comprises a cell sample, the method further comprising contacting the cells with TGF- prior to determining the structure or level of expression of the CTGF nucleic acid molecule in the sample.

14. The method of claim 5, wherein the CTGF nucleic acid molecule is a CT-GF deoxyribonucleic acid (DNA) comprising the TpRE, said method comprising determining the structure of the TpRE. The method of claim 14, wherein determining the structure of the TpRE comprises contacting the CTGF DNA comprising the TpRE with a polypeptide known to selectively bind to a CTGF TpRE.

16. The method of claim 14, wherein determining the structure of the TpRE 25 comprises determining the CTGF DNA sequence. S: 17. The method of claim 14, comprising operatively linking the CTGF DNA comprising the TpRE to a reporter molecule to produce a TIRE construct, the method further comprising contacting the TORE construct with TGF-p, and determining the level of expression of the reporter molecule in response to the TGF-P.

18. A recombinant nucleic acid molecule, comprising a transforming growth factor (TGF-p) regulatory element (TpRE) operably linked to a polynucleotide, wherein said TORE comprises the nucleotide sequence 5'-GTGTCAAGGGGTC-3' (SEQ ID NO: 8).

19. The recombinant nucleic acid molecule of claim 18, wherein the polynucleotide S35 encodes a polypeptide. leo 63 The recombinant nucleic acid molecule of claim 19, wherein the polypeptide is a growth factor.

21. A method of expressing a polynucleotide connective tissue cell-specific manner, the method comprising introducing the recombinant nucleic acid molecule of claim 18 into a connective tissue cell, and contacting the connective tissue cell with TGF-3, thereby expressing the polynucleotide in the connective tissue cell.

22. The method of claim 21, wherein said connective tissue cell is a cell of a population of cells.

23. The method of claim 22, wherein the population of cells comprises cells other than connective tissue cells. Dated this Thirtieth day of May 2003 University of South Florida Patent Attorneys for the Applicant: F B RICE CO C e