AU709842B2

AU709842B2 - Skin treatment formulation and uses thereof

Info

Publication number: AU709842B2
Application number: AU13185/97A
Authority: AU
Inventors: Guido Paduano
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-01-10
Filing date: 1997-01-08
Publication date: 1999-09-09
Anticipated expiration: 2017-01-08
Also published as: CA2242636A1; ITFI960002A0; EP0873113A1; AU1318597A; IT1289845B1; ITFI960002A1; BR9706943A; WO1997025023A1

Description

WO 97/25023 PCT/IT97/00002 -1- "Skin treatment formulation and uses thereof"

DESCRIPTION

Technical field The present invention relates to a compound for the treatment of skin pathologies and unaesthetic conditions and optionally of pathologies of the skin and related tissues. More particularly, the invention relates to a product for the treatment of: 1. skin atrophy striae, 2 skin wrinkles, 3. ageing of the skin, 4. hair loss and alopecia, chapping of the skin, 6. slow cicatrization, 7. skin atrophy pathologies of various types, 8. scars.

The invention also relates to the uses of the said compound.

Backcround art Skin atrophy and the phenomena associated therewith are mainly due to a deficiency in the two proteins of the skin, collagen and elastin, the first being responsible for nourishing and revitalizing the skin tissues while the second has the function of making the skin tissues elastic.

More generally, three main aspects which characterize skin atrophy may be identified: a) deficiency or lack of collagen in the skin; b) deficiency of lack of elastin in the skin; c) lack of or reduction in vascularization.

There are two approaches to treating skin atrophy, involving the integration of the two proteins into the skin: supplying the two proteins directly and supplying the corresponding amino acids, which allow the body to reproduce these proteins by itself, that is to say to metabolize them. Treatment of skin pathologies by integration of collagen and elastin proteins has already been attempted, in particular by topical application of WO 97/25023 PCT/IT97/00002 2 ointments containing-the said proteins.

Direct administration of the proteins is theoretically the fastest route, since the body is supplied directly with the proteins it lacks rather than the components (amino acids) via which it metabolizes these proteins.

However, the treatment methods and the relevant compounds used hitherto have not given satisfactory results. The reason for this is that the mainly topical administration of the two proteins affords a transient and therefore unsatisfactory result, or even shows no results at all owing to the fact that the protein is not absorbed on account of the skin barrier.

Disclosure of the invention The subject of the present invention is a product for the treatment of skin pathologies and unaesthetic conditions and optionally of pathologies of the skin, based on elastin and collagen, which product makes it possible to obtain better and especially longer lasting results.

Basically, the product of the invention contains a combination of at least the following components: 1) collagen, 2) elastin, 3) preferably at least one local vasodilatory substance 4) at least one acid chosen from deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), or a salt thereof, in combination with a suitable vehicle which may also consist of a physiologically acceptable solution, depending on the type of administration for which the formulation is intended.

The combination of these four components makes it possible to obtain results which are markedly superior to those which can be obtained with the products currently available, by virtue of the simultaneous presence not only of the two fundamental proteins but also of an optional vasodilator and at least one of the WO 97/25023 PCT/IT97/00002 3 RNA or DNA acids, which play a fundamental role in the treatment, as will-be clarified later.

In certain cases, a reduction in vascularization accompanies the unaesthetic skin conditions mentioned. In these cases, administration of the optional local vasodilator together with the collagen and elastin, makes it possible to re-establish peripheral blood circulation in the zone treated, thereby giving rise to localized vasodilation and thus allowing the two proteins to reach the treated zones. Moreover, the temporary vasodilation produced by the vasodilatory substance helps vascularization in the tissues and facilitates the provision of nutrients by the blood.

If there is poor vascularization of the tissues treated, despite the administration of a vasodilator together with the proteins, some of the proteins administered may not be bound to the tissues concerned but will be absorbed by the body. The simultaneous provision of at least one of the ribonucleic and deoxyribonucleic acids, or of a salt thereof, allows the tissues treated autonomously to reproduce the two types of protein administered. The reason for this is that DNA helps the tissues receiving it to manufacture proteins with characteristics similar to the proteins administered, while RNA serves to create a memory, in the tissues receiving it, for the two proteins supplied in order to allow the tissues themselves to reproduce these proteins.

The use of one of the two acids RNA or DNA therefore makes it possible to accelerate the healing process by stimulating the autonomous production of collagen and elastin by the skin tissues being treated.

The two acids (or their salts) are preferably used in combination, but appreciable results may also be obtained with only one of the two acids or the respective salt.

According to an improved feature of the invention, the compound may comprise, besides the four WO 97/25023 PCT/IT97/00002 4 main components referred to above, one or more secondary components chosen from one or more of the following groups: amino acids; enzymes and coenzymes; Vitamin

C

keratin (restricted to treatment of the scalp).

Among the amino acids which may be used in the product according to the invention, mention may be made of the following: glycine, proline, hydroxyproline, lysine, tyrosine, isodesmosine. Among the useful enzymes for the use according to the invention are the following: pepsin, pyridoxine (Vitamin B6 coenzyme), biotin or Vitamin H (Vitamin B6 coenzyme).

The amino acids added to the formulation metabolize the proteins, that is to say they are involved in the formation of collagen and elastin. The enzymes and coenzymes are catalysts of the process of protein metabolism, that is to say they increase the rate of biochemical reaction of the amino acids to proteins.

Their presence in combination with amino acids therefore accelerates the metabolization of protein.

The presence of antioxidant, represented by Vitamin C, makes it possible to reduce the oxygen requirement of the cells.

Keratin, the use of which is limited to formulations for treating the scalp, constitutes specific nourishment for promoting the regrowth and strengthening of the hair.

Detailed description of preferred embodiments The composition of the product varies depending on the mode of administration, in particular as regards the vehicles and the excipients. As regards the four fundamental components (or five in the case of the use of both DNA and RNA), they may be used in the following amounts, expressed in parts by weight, including in the absence of other components: Hydrolysed collagen: 3-10 parts WO 97/25023 PCT/IT97/00002 5 Hydrolysed elastin: 1-4 parts Procaine hyrochloride (vasodilator) 1-3 parts Sodium deoxyribonucleate (DNA) 3-10 parts Sodium ribonucleate (RNA) 3-10 parts Excipients and vehicles qs The sodium deoxyribonucleate and ribonucleate can be used independently of or in combination with each other.

Particularly good results are obtained with compositions varying within the following ranges, again expressed in parts by weight: Hydrolysed collagen: 5-9 parts Hydrolysed elastin: 2-4 parts Procaine hyrochloride (vasodilator) 1.5-2.5 parts Sodium deoxyribonucleate (DNA) 4-8 parts Sodium ribonucleate (RNA) 4-8 parts in the presence of appropriate vehicles and/or excipients. The latter may vary depending on the applications and the form of administration. For administration by subcutaneous or intradermal injection or infiltration, the components mentioned above are prepared in a physiological solution, which in this case represents the vehicle. Typically, the parts by weight shown above are combined with 1000 parts by weight of physiological solution. Appropriate excipients and vehicles are used for topical administration, and a few examples of these will be given in the following text together with respective amounts, with respect to a few particularly effective formulations.

As mentioned above, faster results may be obtained with the addition of secondary components, such as certain enzymes and amino acids. A formulation to which all the secondary components mentioned above have been added is given below. The composition relates to an amount of 10 ml, equivalent to 10 g in physiological solution: Hydrolysed collagen: 30-100 mg Hydrolysed elastin: 10-40 mg WO 97/25023 PCT/IT97/00002 6 Procaine hyrochloride: 10-30 mg Sodium deoxyribonucleate 30-90 mg Sodium ribonucleate 30-90 mg Glycine 25-75 mg Proline 100-300 mg Hydroxyproline 25-75 mg Lysine 75-225 mg Tyrosine 5-15 mg Isodesmosine 20-60 mg Pepsin 375-1125 mg Pyridoxine 250-750 mg Biotin 25-75 mg Vitamin C 250-750 mg Hydrolysed keratin 15-45 mg only for treatment of the scalp Physiological solution qs The best results were obtained with formulations having compositions encompassed within the following ranges, again relative to 10 g of product: Hydrolysed collagen: 45-85 mg Hydrolysed elastin: 15-35 mg Procaine hyrochloride: 15-25 mg Sodium deoxyribonucleate 40-80 mg Sodium ribonucleate 40-80 mg Glycine 35-65 mg Proline 140-260 mg Hydroxyproline 35-65 mg Lysine 100-200 mg Tyrosine 7-13 mg Isodesmosine 30-50 mg Pepsin 525-975 mg Pyridoxine 350-650 mg Biotin 35-65 mg Vitamin C 350-650 mg Hydrolysed keratin 20-40 mg only for treatment of the scalp Physiological solution qs The compositions given above remain valid for 1 WO 97/25023 PCT/IT97/00002 7 topical application as regards the first fifteen components, except that they would be in a different andhigher concentration, in view of the increased difficulty of absorption and the increased dispersion. Moreover, the physiological solution would be replaced by a combination of various vehicles and excipients.

Typically, in a cream for the local treatment of atrophy, the following compositions may be used, relative to 10 g of product (where the preferred amounts, again in mg, are shown in parentheses): Hydrolysed collagen: 65-200 mg (90-170) Hydrolysed elastin: 25-75 mg (30-70) Procaine hydrochloride: 20-60 mg (30-50) Sodium deoxyribonucleate 60-180 mg (80-160) Sodium ribonucleate 60-180 mg (80-160) Glycine 50-150 mg (70-130) Proline 200-600 mg (280-520) Hydroxyproline 50-150 mg (70-130) Lysine 150-450 mg (200-400) Tyrosine 10-30 mg (15-25) Isodesmosine 40-120 mg (60-150) Pepsin 750-2250 mg (1050-1950) Pyridoxine 500-1500 mg (700-1300) Biotin 50-150 mg (70-130) Vitamin C 500-1500 mg (700-1300) Sodium hydroxide 0-15 mg (2-10) Vehicle (hydrogenated polyoxyethylenated castor oil) 100-300 mg (150-230) Excipient (acrylic acid polymer) 50-200 mg (80-140) Deionized water qs 10 grams The same composition may be employed for a product in ampules for topical use in the treatment of atrophy, in which case the excipient is replaced by water, with the addition of preserving agents. Ampules for the treatment of the scalp may have the same composition as ampules for the treatment of atrophy, with the addition of keratin in an amount of from 60 to 120 mg

I

WO 97/25023 PCT/IT97/00002 8 per 10 g of product.

In all the compositions, the DNA and the RNA may also be used in the form of potassium deoxyribonucleate and potassium ribonucleate or in another compatible form.

In the case of a product for topical use, vehicles other than the ones mentioned may also be used.

However, hydrogenated polyoxyethylenated castor oil has given particularly advantageous results since it allows the skin barrier to be crossed efficiently.

In the case of preparations for application by subcutaneous or intradermal injection or infiltration, it is advantageous to provide for the addition of sodium bicarbonate in order to eliminate the burning sensation caused by the acidity and the presence of the physiological solution.

The application methods vary depending on the type of treatment and on the route of administration. The latter may be carried out topically or by infiltration via subcutaneous, intra- or mesodermal injection of the compound into the site of the atrophies. The number of applications and the amount of product applied vary according to the area of tissue to be treated and its condition. A few general indications are given below, which a person skilled in the art will use as a guideline for selecting the most suitable mode of application in each individual case. In the case of treatment by infiltration: 1. Treatment of cutaneous striae: subcutaneous infiltrations are performed, using a syringe with a microneedle, by inserting the needle parallel to the surface of the stria along its entire length. On inserting the needle, a tunnel is formed which is filled with the solution as the needle is withdrawn.

2. Treatment of skin wrinkles: intradermal infiltrations are performed, using a syringe with a microneedle, by inserting the needle parallel to the surface of the wrinkle along its entire length. On inserting the needle,

I

WO 97/25023 PCT/IT97/00002 9 a tunnel is formed- which is filled with the solution as the needle is withdrawn.

3. Treatment of skin aaeing: mesodermal infiltrations (that is to say infiltrations into the dermis but to a deeper level than intradermal infiltrations) are performed, with a syringe with a microneedle, in order to provide deep and diffuse nourishment for the tissues concerned.

4. Treatment of the scalp and of alopecia: intradermal infiltrations into the scalp (trichomesotherapy) are performed using a syringe with a microneedle.

Treatment of skin chapping: intradermal infiltrations are performed into the area concerned using a syringe with a microneedle.

6. Treatment of slow cicatrization: intradermal infiltrations are performed into the area concerned using a syringe with a microneedle.

For all the applications listed above, the number of applications depends on the seriousness of the condition of the tissue treated. In general, the number of applications may range from 5 to 50. The amount of solution administered varies according to the size of the area under treatment. Generally speaking, about 0.1 ml of product per cm 2 of tissue treated may be applied in the treatment of cutaneous striae.

Cosmetic treatment by means of topical application of the compound is carried out by rubbing the ampule preparation onto the area to be treated or by massaging into the area concerned in the case of cream preparations. Topical use involves application twice daily over a period varying between one and six months, depending on the seriousness of the condition of the skin tissue.

With regard to treatment of the scalp, the administration of 2 ml of preparation per application may be envisaged for treating the entire scalp, while for atrophy and ageing of the skin, 1 cm 3 of cream or 1 ampule containing 1 ml of solution is used per 500 cm 2 of

-I

WO 97/25023 PCT/IT97/00002 10 surface area.

-Preparation of the composition: An example for the preparation of the following formulation is given hereinafter: NaCl queous solution stabilized pig-collagen 30 g/l sterilized pig-elastin 10/15 g/l glycine 2/4 g/l proline 6/10 g/l hydroxyproline 2/4 g/l Lysine 5/15 g/l Tyrosine 1/3 g/l Pepsin 10/30 g/l pyroxidine 10/30 g/l DNA 60 g/l RNA 60 g/l Biotin 3/6 g/l Procaine 1/3 g/l Collagen and elastin may be of animal or vegetal origin. A process for obtaining hydrolysed crosslinked collagen and hydrolysed cross-linked elastin is described hereinbelow: A.stabilised pig-collagen is mixed in a vacutainer under nitrogen atmosphere at 35/380 for 90 min.; B.the product is filtered on a 1-micrometre filter; C.the filtered product is subject to centrifugation at 3500 rpm for 10 min.; D.the supernatant is eliminated in order to obtain a perfectly clear product; E.after centrifugation the corpuscular part is brought to its starting volume again, by replacing the removed supernatant with a 3% glutoraldehyde or cross-linked polyvinylpolyppyrrolidone solution; F.the solution thus obtained is mixed for 30 min at 35/38 0

C;

G.steps C, D and E are repeated; H.the solution is made to rest for 12 hours; I.thereafter the solution si subject to centrifugation at II I WO 97/25023 PCT/IT97/00002 11 3500 rpm for 2 hours; J.the supernatant is removed.

On the bottom of the container a translucent homogeneous gelatine is collected. The gelatine may be brought at the desired viscosity by addition of a sterilized 0.9% acqueous solution of NaCl.

The same process can be used to produce crosslinked elastin starting from sterilized pig-elastin.

Hydrolized aminoacids, hydrolized DNA and RNA and hydrolized biotin as well as procaine hydrocloride are added to the proteins treated as above described in order to obtain the above preparation.

The same process can be used with twice the amount of elastin and collagen 60 g/l collagen and 20/30 g/l elastin.

The product thus obtained is sucked in a syringe or other suitable container and the final package sterilized with gamma-irradiation. The whole process is performed in a white chamber (class "100") under laminar flux hood.

It should be understood that the formulations mentioned constitute an example given solely by way of practical demonstration of the invention, it being possible for the composition to vary within the limits defined in the attached claims without thereby departing from the scope of the underlying concept of this invention.

Claims

1. Preparation for treating the skin, including, in combination: collagen; elastin; at least one acid chosen from deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) or a salt thereof;- a local vasodilatory substance a vehicle and/or an excipient.

2. Preparation according to Claim 1, additionally including at least one enzyme chosen from the group including: pepsin, pyridoxine, biotin.

3. Preparation according to Claim 1 or 2, additionally including at least one amino acid chosen from the group including: glycine, proline, hydroxyproline, lysine, tyrosine, isodesmosine.

4. Preparation according to one or more of the preceding claims, additionally including Vitamin C. Preparation according to one or more of the preceding claims, additionally including keratin.

6. Preparation according to claim 1, in which the said vasodilatory substance is procaine hydrochloride.

7. Preparation according to Claim 1, including in combination, expressed in parts by weight: Hydrolysed collagen: 3-10 parts Hydrolysed elastin: 1-4 parts S Procaine hydrochloride (vasodilator) 1-3 parts Sodium deoxyribonucleate 3-10 parts Sodium ribonucleate 3-10 parts.

8. Preparation according to Claim 7, including in combination, expressed in parts by weight: Hydrolysed collagen: 4-9 parts Hydrolysed elastin: 2-4 parts Procaine hydrochloride 1.5-2.5 parts Sodium deoxyribonucleate 4-8 parts Sodium ribonucleate 4-8 parts.

9. Preparation according to Claim 1, including in combination, expressed in parts by weight: C. 13 Hydrolysed collagen: 3-10 parts Hydrolysed elastin: 1-4 parts Procaine hydrochloride 1-3 parts Sodium deoxyribonucleate 5-20 parts.

10. Preparation according to Claim 1, including in combination, expressed in parts by weight: Hydrolysed collagen: 3-10 parts Hydrolysed elastin: 1-4 parts Procaine hydrochloride 1-3 parts Sodium ribonucleate 5-20 parts.

11. Preparation according to one or more of the preceding 'claims, including an excipient and a vehicle for topical application. S 12. Preparation according to one or more of Claims 15 1 to 10, including a physiological solution for intradermal or subcutaneous application as vehicle.

13. Preparation according to one or more of Claims 1 to 10, including, per 10 grams of product: Hydrolysed collagen:

30-100 mg 20 Hydrolysed elastin: 10-40 mg Procaine hydrochloride: 10-30 mg Sodium deoxyribonucleate 30-90 30-90 mg Sodium ribonucleate 30-90 mg Glycine 25-75 mg Proline

100-300 mg Hydroxyproline 25-75 mg SLysine 75-225 mg Tyrosine 5-15 mg Isodesmosine 20-60 mg Pepsin

375-1125 mg Pyridoxine 250-750 mg Biotin 25-75 mg Vitamin C 250-750 mg Physiological solution qs 10 grams 14. Preparation according to Claim 13, additionally including from 15 to 45 mg of hydrolysed keratin per 10 g f product. jPreparation according to Claim 14, including, 1_ 14 per 10 grams of product: Hydrolysed collagen: 45-85 mg Hydrolysed elastin: 15-35 mg Procaine hydrochloride: 15-25 mg Sodium deoxyribonucleate 40-80 mg Sodium ribonucleate 40-80 mg Glycine 35-65 mg Proline 140-260 mg Hydroxyproline 35-65 mg Lysine 100-200 mg Tyrosine 7-13 mg Isodesmosir;e 30-50 mg S: Pepsin

525-975 mg f Pyridoxine 350-650 mg 15 Biotin 35-65 mg Vitamin C 350-650 mg Hydrolysed keratin 20-40 mg Physiological solution qs 10 grams 16. Preparation according to one or more of Claims 20 1 to 10, for topical use, including, per 10 grams of product: Hydrolysed collagen: 65-200 mg Hydrolysed elastin: 25-75 mg Procaine hydrochloride: 20-60 mg Sodium deoxyribonucleate 60-180 mg Sodium ribonucleate 60-180 mg Glycine 50-150 mg Proline 200-600 mg Hydroxyproline 50-150 mg Lysine 150-450 mg Tyrosine 10-30 mg Isodesmosine 40-120 mg Pepsin

750-2250 mg Pyridoxine 500-1500 mg Biotin 50-150 mg -O Vitamin C 500-1500 mg ic l e 100-300 mg onized water qs 10 grams 15 17. Preparation according to Claim 16, including, per 10 grams of product: Hydrolysed collagen: 90-170 mg Hydrolysed elastin: 30-70 mg Procaine hydrochloride: 30-50 mg Sodium deoxyribonucleate 80-160 mg Sodium ribonucleate 80-160 mg Glycine 70-130 mg Proline 280-520 mg Hydroxyproline 70-130 mg Lysine Lysine 200-400 mg S. Tyrosine 15-25 mg Isodesmosine0-150 mg 60-150 mg Pepsin sin

1050-1950 mg 15 Pyridoxine 700-1300 mg Biotin Biotin 70-130 mg Vitamin C 700-1300 mg Vehicle 150-230 mg Deionized water qs 10 grams 20 18. Preparation according to Claim 16 or 17, additionally including, per 10 grams of product, from 0 to 10 mg and preferably from 3 to 6 mg of sodium hydroxide. 19. Preparation according to one or more of Claims S 25 16 to 18, in which the said vehicle includes hydrogenated polyoxyethylenated castor oil. 20. Preparation according to one or more of Claims 16 to 19, additionally including, per 10 grams of product, from 50 to 200 mg and preferably from 80 to 140 mg of an excipient which is physiologically compatible with topical application. 21. Preparation according to Claim 20, in which the said excipient is an acrylic acid polymer. 22. Preparation according to one or more of Claims 15 to 17, additionally including, per ten grams of product, from 30 to 90 mg and preferably from 40 to 70 mg f hydrolysed keratin. Cosmetic treatment of the skin, including the I 16 application of a preparation according to one or more of Claims 1 to 22. 24. Treatment according to Claim 23, in which the said preparation is applied by subcutaneous, intradermal or mesodermal infiltration into the area to be treated. Treatment according to Claim 23, in which the said preparation is applied topically. 26. Treatment according to Claim 25, in which the said preparation is applied in the form of a cream or an ointment. 27. Treatment according to Claim 25, in which the said preparation is applied in the form of an aqueous suspension by rubbing it in. 28. Use of a combination of the following substances: collagen; elastin; at least one acid chosen from deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), or a salt thereof; a local vasodilatory substance; a vehicle and/or an excipient, for the preparation of a medical product for the therapeutic treatment of skin pathologies. 29. Use of a combination of the following substances: collagen; elastin; at least one acid chosen from deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), or a salt thereof; a local vasodilatory substance; a vehicle and/or an excipient, for the preparation of a product for cosmetic use in the treatment of unaesthetic skin conditions.