JP5897558B2 - 10−プロパルギル−10−デアザアミノプテリンによりメトトレキサート抵抗性疾患を治療するための方法 - Google Patents
10−プロパルギル−10−デアザアミノプテリンによりメトトレキサート抵抗性疾患を治療するための方法 Download PDFInfo
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- JP5897558B2 JP5897558B2 JP2013513352A JP2013513352A JP5897558B2 JP 5897558 B2 JP5897558 B2 JP 5897558B2 JP 2013513352 A JP2013513352 A JP 2013513352A JP 2013513352 A JP2013513352 A JP 2013513352A JP 5897558 B2 JP5897558 B2 JP 5897558B2
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Description
続く実施例は、単に説明を目的として提供するものであり、本発明の範囲を限定するものではない。
図1は、10−プロパルギル−10−デアザアミノプテリンを調製する際に有用な合成スキームを示す。18mLの篩過乾燥THF中の油分散中60%NaHの混合物(1.06g、26.5mmol)を0℃に冷却した。冷混合物を乾燥THF(7mL)中のホモテレフタル酸ジメチルエステル(5.0g、24mmol、図1の化合物1)の溶液で処理し、この混合物を0℃で1時間撹拌した。臭化プロパルギル(26.4mmol)を添加し、混合物を00℃でさらに1時間、次いで室温で16時間撹拌した。得られた混合物を2.4mLの50%酢酸で処理し、次いで240mLの水に注いだ。混合物をエーテル(2x150mL)で抽出した。エーテル抽出物を合わせ、Na2SO4上で乾燥させ、橙黄色の油状物質になるまで濃縮した。シリカゲル(600mLの230−400メッシュ)上でクロマトグラフィーを行い、シクロヘキサン−EtOAc(8:1)により溶出して、白色固体(4.66)として生成物α−プロパルギルホモテレフタル酸ジメチルエステル(化合物2)を得たが、これはTLC(シクロヘキサン−EtOAc、3:1)により均質であることが明らかになった。しかし、この生成物における質量スペクトルデータから、これが所望の生成物2とジプロパルギル化化合物との混合物であることが示された。出発物質1は検出されなかった。HPLCから、モノプロパルギル化生成物とジ−プロパルギル化生成物の比が約3:1であることが示される。化合物1とは異なり、ジプロパルギル化生成物は反応の次の段階で不要な副生成物を生成させ得ないので、この物質は化合物3への変換に適切であった。10−プロパルギル−10−デアザアミノプテリンから10−dAMから完全に除去することが非常に困難なため、本合成を進行させるのに使用される生成物中に出発化合物1がないことは、最終生成物に至る変換中の10−dAMの逐次形成を回避するために非常に重要である。
様々な固形腫瘍タイプにわたり10−プロパルギル−10−デアザアミノプテリンの活性を調べるために、10−プロパルギル−10−デアザアミノプテリンの細胞毒性活性に対する感受性について15種類のヒト固形腫瘍細胞株を調べた。
結腸(HT29、HCT116、COLO205、HCC2998)、乳部(MCF7、MDA−MB−435)、肺(HOP62、HOP92)、卵巣(OVCAR3、IGROV1)、前立腺(DU145、PC3)及び頭頸部(SCC61、HEP2、SQ20B)ヒト癌細胞株のパネルをATCC(Rockville、MD)及びNational Cancer Institute collectionsから購入した。10%ウシ胎仔血清、2mMグルタミン、100単位/mLペニシリン及び100μM/mLストレプトマイシンを補給したRPMI培地中で細胞を単層として生育させた。
生成データは全て、2つ組で行った3回の個別の実験の結果であった。MTTアッセイを用いて細胞生存性を調べたが、このアッセイは既に記載されている通りに行った(Hansen、1989)。簡単に述べると、2x103個/ウェルの密度で96ウェルプレートに細胞を播種した。細胞を120時間インキュベートし、次いで37℃で4時間、0.4mg/mLのMTT色素(3−[4,5−ジメチルチアゾール−2−イル]−2,5−ジフェニルテトラゾリウムブロミドを添加した。0.1mLのDMSO中で単層を懸濁し、マイクロプレートリーダーを用いて560nmでの吸収を測定した。陽性及び陰性対照には、それぞれ未処理細胞又はMTTを含有し、細胞を含まない培地が入ったウェルが含まれた。紫色の不溶性ホルマザンへの黄色の水溶性テトラゾリウムMTTの変換は、ミトコンドリアデヒドロゲナーゼにより触媒され、生存細胞数を推定するために使用される。未処理細胞に対応する対照値を100%とし、処理した試料の生存率を対照の%として表した。細胞生存率が50%に低下する濃度としてIC50値を決定した。
50mM HEPES(pH7.6)、150mM NaCl、1%Triton X−100、2mMバナジウム酸ナトリウム、100mM NaF及び0.4mg/mLフッ化フェニルメチルスルホニルを含有する緩衝液中で細胞を溶解させた。等量のタンパク質(20−50μg/レーン)をSDS−PAGEに供し、ニトロセルロース膜に転写した。抗切断型PARP、抗切断型カスパーゼ3、抗カスパーゼ9(Cell Signaling、Saint Quentin Yvelines、France)、抗DHFR(Abcam、France)、抗β−アクチン(Sigma Aldrich、Saint−Quentin Fallavier、France)特異的一次抗体を用い、続いてペルオキシダーゼ結合二次抗体を用い、化学発光により視覚化して膜を調べた。
表1で示されるように、15種類の癌細胞株においてプララトレキサートの抗増殖効果を調べた。経時変化実験から、細胞がプララトレキサートに72時間曝露された場合に最適抗増殖効果が達成されたことが分かった(図1A)。プララトレキサートIC50は、前立腺癌細胞株PC3の場合の0.01±0.002μMから、MDA−MB−435細胞株の場合の>350μMの範囲にわたった。興味深いことに、IC50が100倍超異なる2つの群の細胞株が観察され、PC3、SCC61、DU145、HT29、HOP62、SQ20B、HOP92、HEP2及びIGROV1細胞を含む一方の群のIC50は<0.1μMであり、Colo205、HCC2998、MCF7、HCT116、OVCAR3及びMDA−MB−435細胞のIC50値は≧9μMであった。
癌細胞株のパネルにおいて、葉酸拮抗剤に対する感受性に関与することが知られている遺伝子の発現を分析した。DHFR、FPGS、TS/TYMS、(チミジル酸シンテターゼ)、SCL19A1/RFC−1、GARFT(グリシンアミドリボヌクレオチドホルミルトランスフェラーゼ)、SLC25A32(ミトコンドリア葉酸輸送体/担体)及びABC輸送体B1(ABCB1又はMDR1)mRNA発現をqRT−PCRにより調べた(図3A)。これらの細胞株は、様々なレベルでこれらの葉酸経路遺伝子を発現したが、プララトレキサートに対する感受性とTS、SCL19A1/RFC−1、GARFT、SLC25A32及びMDR1のmRNA発現との間に顕著な相関は見られなかった。プララトレキサート−感受性細胞は、「抵抗性」群よりも比較的高いレベルで、プララトレキサートの標的であるDHFRを発現したが、これは統計学的に有意ではなかった(p=0.083、図3A)。プララトレキサート−感受性細胞は、抵抗性細胞よりも有意に高いレベルのFPGS mRNAを発現した(t検定、p=0.002)。全体として、FPGS mRNA発現とプララトレキサート感受性(IC50)との間で正の相関の傾向がみられ(R2=0.47、p<0.01)、このことから、プララトレキサート抗増殖活性におけるポリグルタミン酸化の重要な役割が示唆される。
10−プロパルギル−10−デアザアミノプテリン及びメトトレキサート抵抗性細胞株の生成
10−プロパルギル−10−デアザアミノプテリン抗増殖効果の予測因子の特徴を調べるために、6ヶ月間にわたり10−プロパルギル−10−デアザアミノプテリンに曝露し、この濃度を段階的に上昇させることによって、それぞれ親であるDU145及びHEP2細胞から細胞株DU−PDX及びHEP−PDXを生成させた。得られたDU−PDX及びHEP−PDX細胞は、親細胞よりも10−プロパルギル−10−デアザアミノプテリンに対する感受性が少なくとも200倍及び500倍低かった。薬物不含培地中で5回継代した後、抵抗性細胞はそれらの薬物抵抗性を維持し、このことから、これらの細胞株の安定性が示唆される。
ABI Prism 7900 Sequence Detection System(Perkin−Elmer Applied Biosystems、Foster City、CA、USA)を用いた定量RT−PCRの理論的及び実際的な局面は、当業者にとって公知である。結果は、TBP遺伝子(内因性RNA対照)に対する、及び標的遺伝子mRNAの最小量を含有した試験シリーズ由来の細胞株試料からなるキャリブレーター(1x試料)に対する標的遺伝子発現のn倍の差として表した。実験は2つ組で行った。
Claims (9)
- 有効量の10−プロパルギル−10−デアザアミノプテリン又はその医薬的に許容可能な塩を含むメトトレキサート抵抗性疾患用医薬組成物であって、
前記メトトレキサート抵抗性疾患を有する個体において使用し、前記メトトレキサート抵抗性疾患は、メトトレキサートに対する獲得抵抗性を有する疾患である、医薬組成物。 - 前記疾患が癌である、請求項1に記載の医薬組成物。
- 治療しようとする癌が、前立腺癌、T細胞リンパ腫、乳癌、肺癌、血液悪性腫瘍、頭頸部癌、消化管の癌、卵巣癌及び骨肉種である、請求項2に記載の医薬組成物。
- 前記疾患が炎症性疾患である、請求項1に記載の医薬組成物。
- 前記炎症性疾患が関節リウマチである、請求項4に記載の医薬組成物。
- 前記疾患がメトトレキサート抵抗性新生物である、請求項1に記載の医薬組成物。
- 前記メトトレキサート抵抗性新生物は、前立腺癌、T細胞リンパ腫、乳癌、肺癌、血液悪性腫瘍、頭頸部癌、消化管の癌、卵巣癌及び骨肉種である、請求項6に記載の医薬組成物。
- 前記医薬組成物が経口投与用に製剤化される、請求項1〜7のいずれか1項に記載の医薬組成物。
- 前記医薬組成物が静脈内投与用に製剤化される、請求項1〜7のいずれか1項に記載の医薬組成物。
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US20110190305A1 (en) | 2010-02-02 | 2011-08-04 | Allos Therapeutics, Inc. | Optically Pure Diastereomers of 10-Propargyl-10-Deazaaminopterin and Methods of Using Same |
BR112013002787A2 (pt) * | 2010-08-10 | 2016-06-07 | Allos Therapeutics Inc | métodos para estender a sobrevida livre de progressão utilizado 10-propargil-10-deazaaminopterina |
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