JP6899110B2 - 細胞増殖抑制剤およびがんの予防・治療剤 - Google Patents
細胞増殖抑制剤およびがんの予防・治療剤 Download PDFInfo
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Description
のいずれかで表される置換または非置換の環式化合物含有基を表すか、または、2以上の前記環式化合物含有基がそれぞれホスホジエステル結合を介して連結してなる2価の基を表し、Bは、水素原子またはヒドロキシル保護基を表す、
で表されるmiR−205類似体であって、
ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から連続した少なくとも5個のホスホジエステル結合が、下記化学式(3):
で表されるリン原子修飾結合であることを特徴とする、miR−205類似体が提供される。
(基本構造)
本明細書に開示のmiR−205類似体は、下記化学式(1)で表されるものである。本明細書では、ガイド鎖の塩基配列を配列番号1で表し、パッセンジャー鎖の塩基配列を配列番号2で表す。
化学式(1)において、ガイド鎖およびパッセンジャー鎖の3’末端に位置するヌクレオチドは、それぞれ「−A−B」で表される構造を有する基によって修飾されている。具体的には、各鎖の3’末端のヌクレオチドの塩基に結合した3’末端側のホスホジエステル結合の酸素原子に、「−A−B」で表される構造を有する基が結合している。
本発明に係るmiR−205類似体の特徴的な構成の1つは、ガイド鎖を構成する塩基(全部で22個の塩基が含まれる)に結合したホスホジエステル結合(このようなホスホジエステル結合は全部で23個存在する)のうち、ガイド鎖の3’末端側から連続した少なくとも5個のホスホジエステル結合が、所定の構造を有するリン原子修飾結合である点にある。
上述した本発明に係るmiRNA−205類似体は、その塩基配列に基づき、従来公知の手法(核酸自動合成機を用いたホスホロアミダイト法による合成)により、化学的に合成することができる。また、このようにして製造されたmiRNAのガイド鎖およびパッセンジャー鎖の双方の3’末端に上述した「−A−B」で表される修飾構造を導入する手法についても、従来公知の知見(例えば、国際公開第2007/094135号パンフレットや特開2011−251912号公報など)が適宜参照されうる。さらに、特定箇所のホスホジエステル結合を上記化学式(3)で表されるリン原子修飾構造とする手法についても、従来公知の知見が適宜参照されうる。例えば、ホスホロアミダイト法による拡散合成の最終段階における3価のリンの5価への酸化を、酸化剤溶液に代えて硫化剤溶液を用いて行うことで、ホスホジエステル結合に代えてホスホロチオエート結合を導入することが可能である。
発明の一形態によれば、上述したmiR−205類似体を有効成分として含有する細胞増殖抑制剤が提供される。ここで、「細胞増殖抑制剤」とは、例えばがん細胞等の細胞の増殖を抑制することによって種々の用途に用いられうる剤をいう。そして、細胞増殖抑制剤の用途としては、例えば、がんの予防および/または治療剤が挙げられる。ここで、本形態に係る細胞増殖抑制剤によって増殖が抑制されるがん細胞について特に制限はないが、例えば、大腸がん、乳がん、肺がん、前立腺がん、食道がん、胃がん、肝臓がん、胆道がん、脾臓がん、腎がん、膀胱がん、子宮がん、卵巣がん、精巣がん、甲状腺がん、膵臓がん、脳腫瘍、造血器腫瘍、悪性黒色腫などが挙げられ、好ましくは悪性黒色腫が挙げられる。つまり、本形態に係る細胞増殖抑制剤は、これらのがんの予防・治療剤として用いられうる。
生細胞数、mRNAの発現量およびルシフェラーゼ活性はそれぞれ3サンプル測定し、その平均値±標準偏差(Mean±SD)を求め、コントロールを100%あるいは1.0としたときの相対値を示した。実験に用いた各miRNAあるいはsiRNAをトランスフェクションした場合の結果をスチューデントのt検定(有意水準5%)にて有意差検定を行った。
ヒト悪性黒色腫由来細胞株A2058をヒューマンサイエンス研究資源バンクから購入し、製造者のプロトコールに従って維持した。
A2058細胞を、トランスフェクションの前日に、6穴プレートに0.5×105細胞/ウェルの濃度で播種した。miR−205の模倣体としては、野生型miR−205と同一の配列を有し、一般に入手可能なmiR−205(Ambion(登録商標);インビトロジェン)を用いた。また、細胞のトランスフェクションには、上記のmiR−205のほか、3’オーバーハング領域に上記化学式4で表される構造(*2には水素原子が結合)が付加され、かつミスマッチ部位のパッセンジャー鎖の3つの塩基をマッチさせた合成miR−205類似体(北海道システム・サイエンス株式会社、化学式(1))を用いた。なお、本実験で用いたmiR−205類似体は、下記の表1に示す部位のホスホジエステル結合がリン原子修飾構造(具体的には、ホスホロチオエート結合)とされている。
上述したように各miRNA類似体をトランスフェクションし、72時間培養した後に0.5%トリプシン-EDTA(ethlenediaminetetraacetic acid、SIGMA、St. Louis、MO、USA)を用いて、細胞を回収し、トリパンブルーを用いた色素排除法にて、改良Neubauer型血球計算盤(ERMA、東京)を用いて生細胞数を計測した。結果を図1に示す。これらの図に示すように、上述したmiR−205類似体のなかで、ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から連続した少なくとも5個のホスホジエステル結合が所定のリン原子修飾結合(ここでは、ホスホロチオエート結合)とされている3種(ds1、ds3およびds11)が、コントロール(陰性対照)に対して有意に高い細胞増殖抑制作用を示した。
本実験では、本発明に係るmiRNA−205類似体のin vitroでの安定性を評価した。
本発明に係るmiR−205類似体のガイド鎖のRNA配列である。
〔配列番号:2〕
本発明に係るmiR−205類似体のパッセンジャー鎖のRNA配列である。
〔配列番号:3〕
ヒトの野生型miR−205のガイド鎖のRNA配列である。
〔配列番号:4〕
ヒトの野生型miR−205のパッセンジャー鎖のRNA配列である。
Claims (13)
- 下記化学式(1):
化学式(1)において、Aは、下記化学式(2a)〜(2g):
化学式(2a)において、ZはCHまたはNを表す、
のいずれかで表される置換または非置換の環式化合物含有基を表すか、または、2以上の前記環式化合物含有基がそれぞれホスホジエステル結合を介して連結してなる2価の基を表し、Bは、水素原子またはヒドロキシル保護基を表す、
で表されるmiR−205類似体であって、
ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から連続した少なくとも7個のホスホジエステル結合が、下記化学式(3):
化学式(3)において、X1は独立してO、SまたはSeを表し、X2は独立してOHもしくはO−、SHもしくはS−、SeHもしくはSe−、炭素数1〜4個のアルキル基またはモルホリノ基を表す(ただし、X1がOでありX2がO−である場合を除く)、
で表されるリン原子修飾結合であることを特徴とする、miR−205類似体。 - ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から連続した22個以下のホスホジエステル結合が、前記化学式(3)で表される構造を有する、請求項1に記載のmiR−205類似体。
- ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から連続した11個以下のホスホジエステル結合が、前記化学式(3)で表される構造を有する、請求項1に記載のmiR−205類似体。
- ガイド鎖を構成する塩基に結合したホスホジエステル結合のうち、ガイド鎖の3’末端側から、連続した7個、連続した11個、または連続した22個のホスホジエステル結合が、前記化学式(3)で表される構造を有する、請求項1に記載のmiR−205類似体。
- 前記化学式(3)において、X1はOであり、X2はSHもしくはS−、SeHもしくはSe−、炭素数1〜4個のアルキル基またはモルホリノ基を表す、請求項1〜4のいずれか1項に記載のmiR−205類似体。
- 前記化学式(3)において、X1はOであり、X2はSHまたはS−を表す、請求項5に記載のmiR−205類似体。
- 前記Aが、1または2以上の化学式(2a)で表される置換されていてもよい環式化合物含有基を含む、請求項1〜6のいずれか1項に記載のmiR−205類似体。
- 前記Bが、水素原子を表す、請求項1〜8のいずれか1項に記載のmiR−205類似体。
- 請求項1〜9のいずれか1項に記載のmiR−205類似体を有効成分として含有する、細胞増殖抑制剤。
- 請求項1〜9のいずれか1項に記載のmiR−205類似体を有効成分として含有する医薬。
- 請求項1〜9のいずれか1項に記載のmiR−205類似体を有効成分として含有する、がんの予防および/または治療剤。
- 前記がんが、悪性黒色腫である、請求項12に記載の予防および/または治療剤。
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