JP4351629B2 - 新規なミクロモノスポラ種からのバフィロマイシン−様代謝産物 - Google Patents
新規なミクロモノスポラ種からのバフィロマイシン−様代謝産物 Download PDFInfo
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- JP4351629B2 JP4351629B2 JP2004518781A JP2004518781A JP4351629B2 JP 4351629 B2 JP4351629 B2 JP 4351629B2 JP 2004518781 A JP2004518781 A JP 2004518781A JP 2004518781 A JP2004518781 A JP 2004518781A JP 4351629 B2 JP4351629 B2 JP 4351629B2
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Description
のバフィロマイシン誘導体ならびにその製薬学的に許容され得る塩及びエステルを開示している。化合物は哺乳類における腫瘍成長に対抗する活性を示す。特許文献1はさらに、式(II)の化合物又は既知のマクロライド化合物の投与による腫瘍浸潤の処置もしくは予防のための方法を提供している。
図面の簡単な記述
図1A:式(I)の化合物による腫瘍細胞増殖の用量−依存性阻止(バイオアッセイ)。ヒトMCF−7腫瘍細胞を、示される濃度の式(I)の化合物を用いて4日間処理した。標準未処理細胞の%として表される結果は、少なくとも3回の異なる実験の平均±SEである。
図1B:式(I)の化合物による腫瘍細胞増殖の用量−依存性阻止(バイオアッセイ)。ヒトHT−29腫瘍細胞を、示される濃度の式(I)の化合物を用いて4日間処理した。標準未処理細胞の%として表される結果は、少なくとも3回の異なる実験の平均±SEである。
図1C:式(I)の化合物による腫瘍細胞増殖の用量−依存性阻止(バイオアッセイ)。ヒトK562/C1,000腫瘍細胞を、示される濃度の式(I)の化合物を用いて4日間処理した。標準未処理細胞の%として表される結果は、少なくとも3回の異なる実験の平均±SEである。
図1D:式(I)の化合物による腫瘍細胞増殖の用量−依存性阻止(バイオアッセイ)。ヒトMalme−3M腫瘍細胞を、示される濃度の式(I)の化合物を用いて4日間処理した。標準未処理細胞の%として表される結果は、少なくとも3回の異なる実験の平均±SEである。
新規な抗腫瘍化合物(細胞毒)の同定のために設計されたスクリーニングプログラムの経過中に、新規なバフィロマイシン−様代謝産物が単離された。同じ代謝産物がミクロモノスポラ属の2種の放線菌の液体発酵培養物から単離された。ミクロモノスポラ種JS1035はSombo,Cameroonからの川の沈殿物から単離され、ミクロモノスポラ種JS1044はMundemba,Cameroonからの川の沈殿物から単離された。両方の株が同じ活性化合物を生産することが検出されるとすぐに、ミクロモノスポラ種JS1035からの液体発酵培養物中に存在する化合物をさらに特性化することが決定された。これらの新規なマクロライドの生産に使用される各微生物の培養物は、Gent大学のBelgian Coordinated Collections of MicroorganismにおけるLaboratory for Microbiologyに、ミクロモノスポラ種JS1035の場合は受託番号LMG P−21525の下に、及びミクロモノスポラ種JS1044の場合は受託番号LMG P−21526の下に寄託された。これらの寄託はブタペスト条約の規定の下に成され、それらの公共への利用性についてのすべての制限は、最終的に本出願への特許の付与の際に保持されるであろう。
一般
発酵及び単離
ミクロモノスポラ種JS1035の液体発酵培養物を、酢酸エチルを用いて抽出して粗抽出物を得、それを続いて向流分配クロマトグラフィー(CPC)を用いて精製した。異なる条件を用いる2回の連続的CPC分別の後に、構造解明のための純粋な材料を得た。この材料の質量スペクトル分析(表1を参照されたい)は、853の分子量及びC47H67NO13の分子式を示した。
式(I)の化合物に関するNMRデータを最初にCDCl3中で得た。しかしながらすぐに、式(I)の化合物がこの溶媒中で安定でないことが見出された。その後のNMR研究はアセトン−d6を用いて行なわれ、複雑なプロトンNMRスペクトルを与えた。13CNMR、分極移行による無変形増強(Distortionless Enhancement by Polarization Transfer(DEPT))、相関分光学(COSY)、異核多重量子コヒーレンス(Heteronuclear Multiple Quantum Coherence(HMQC))及び異核多重バンドコヒーレンス(Heteronuclear Multiple Band Boherence(HMBC))を含むNMR実験の完全な1組を得た。
選ばれたヒト腫瘍細胞系(乳ガンMCF−7、結腸ガンHT−29、白血病K562/C1,000及び黒色腫Malme−3M)における細胞増殖の阻止に基づく細胞増殖アッセイ(本明細書で「バイオアッセイ」と呼ぶ)のパネルを用い、精製法全体を通じての種々の試料における抗増殖活性を同定した。4種の培地中で生育した株JS1035からの抽出物をバイオアッセイにおいて調べた;抗増殖活性のほとんどを含有したものをさらなる研究のために選択した。活性抽出物の1:1,000−希釈物は、調べられた3つの細胞系(黒色腫Malme−3M細胞系はこの段階で省略された)において細胞増殖のほとんど完全な阻止を生じた。この最初の粗抽出物から、向流分配クロマトグラフィーから集められた画分をMCF−7細胞増殖につきそれぞれに分析した。主要な1つの画分が抗増殖活性を含有することが示され、それを次いでHPLCによりさらに精製した。1つのHPLCピークが、バイオアッセイにおける細胞増殖の阻止により測定される抗増殖活性を含有することが見出された。このピークを用いて式(I)の活性化合物の構造解明を開始した。その後の構造研究は、2つの連続的CPC段階を用いて単離される材料を用いて完了した。
1H及び13CNMRスペクトルは、それぞれ500及び125MHzで運転されるBruker Avance DRX 500分光計上で300Kにおいて記録された。DEPT、COSY、HMQC及びHMBC実験のために標準的パルス配列(standard pulse sequences)を用いた。ROESYデータは、300,000μs(22dBにおいて)のスピンロックパルスを用いて取得された。融点はElectrothermal 9100融点装置を用いて決定され、未修正である。反転回復(IR)データはPerkin Elmer 1600 Series FTIR分光光度計を用いて取得された。旋光データを得るために、Perkin−Elmer 243B旋光計を用いた。高分解能MSデータは、Micromass 70SEQ Tandem Hybrid Mass Spectrometerを用いて得た。CPCは、Waters 991 Photodiode Array検出器(270nmにおいて監視)と接触した(interfaced)Ito多層コイルカラムが備えられたP.C.,Inc.高速向流クロマトグラフ上で行なわれた。
発酵及び単離
放線菌株JS1035は、Sombo,Cameroonの近くで集められた川底沈殿物から単離された。種培地(seed medium)は、pHが6.5に調節された1Lの蒸留水中にグルコース 20g、Pharmamedia(Trader’s Protein) 15.0g、酵母抽出物 5.0g、CaCO3 4.0g、(NH4)2(SO4) 3.0g、ZnSO4・7H2O 0.03gを含有した。生産培地は、pHが7.0に調節された1Lの蒸留水中にグルコース 20.0g、デキストリン 50.0g、Pharmamedia(Trader’s Protein) 30.0、酵母抽出物 1.0g、CaCO3 5.0g、CoCl2・6H2O 0.001gを含有した。培地を25又は30mLのアリコートにおいて250mLのフラスコに分配し、15分間オートクレーブにかけた。出発培養物(250mLのErlenmeyerフラスコ当たりに25mLの種培地)に接種するために凍結保存胞子(frozen spore stocks)(1.0mL)を用いた。出発培養物を28℃及び約75%の湿度において、軌道振盪機(2“スロー(throw),250rpm)上で48時間インキュベーションした。出発培養物(1mL)を用いて200個の生産培地フラスコ(250mLのErlenmeyerフラスコ当たりに30mLの生産培地)に接種し、それを次いで上記の条件で6日間インキュベーションした。
薬剤
調べられたすべての試料はDMSO中に溶解され、培地中でさらに希釈され(典型的には1:1,000)、細胞増殖アッセイにおいて最終的DMSO濃度は0.1%(v/v)を決して超えなかった。MTT[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]、MTS[3−(4,5−ジメチルチアゾール−2−イル)−5−(3−カルボキシメトキシフェニル)−2−(4−スルホフェニル)−2H−テトラゾリウム内部塩]及びPMS[フェナジンメトサルフェート]をホスフェート−緩衝食塩水(PBS)中に溶解した。MTT及びMTSは両方とも細胞増殖及び毒性試験において広く用いられるテトラゾリウム塩である。生存細胞中に入ると、これらのテトラゾリウム塩は強く着色したホルマザン誘導体に(生物)還元される。MTTの場合、生成するホルマザンは結晶性であり、比色定量の前に溶解しなければならない。MTSは、可溶性ホルマザン最終的生成物へのその有効な還元のために、中間電子受容体(PMS)を必要とし、懸濁細胞系(suspension cell line)の場合に用いられる。
細胞系及び細胞培養
ヒトMCF−7乳腺ガン細胞を、2mM L−グルタミン、1mM NaPyruvate、50μg/ml ゲンタマイシン及び5% 胎児ウシ血清が補足されたDulbeccoの修正Eagle培地(Dulbecco’s Modified Eagle Medium)(DMEM)中で培養した。ヒトHT−29結腸ガン細胞を、2mM L−グルタミン、50μg/ml ゲンタマイシン及び5% 胎児ウシ血清が補足されたMc Coy’s 5a培地中で培養した。ヒトMalme−3M黒色腫細胞を、2mM L−グルタミン、1mM NaPyruvate、50μg/ml ゲンタマイシン及び10% 胎児ウシ血清が補足されたDMEM培地中で培養した。ヒトDU 145前立腺ガン細胞を、2mM L−グルタミン、1mM NaPyruvate、50μg/ml ゲンタマイシン及び10% 胎児ウシ血清が補足されたDMEM培地中で培養した。ヒトCapan−1膵臓腺ガン細胞を、2mM L−グルタミン、1mM NaPyruvate、50μg/ml ゲンタマイシン及び10% 熱不活化胎児ウシ血清が補足されたDMEM培地中で培養した。ヒトHCT 116結腸直腸ガン細胞を、2mM L−グルタミン、50μg/ml ゲンタマイシン及び10% 胎児ウシ血清が補足されたMc Coy’s 5a培地中で培養した。ヒトH1299非−小肺ガン細胞を、2mM L−グルタミン、1mM NaPyruvate、10mM HEPES及び10% 熱不活化胎児ウシ血清が補足されたRPMI 1640培地中で培養した。これらの細胞系のすべてはATCC[Amerocan Type Culture Collection,Manassas,VA,USA]から得た。ヒトA2780卵巣ガン細胞系は、Dr.T.C.Hamilton[Fox Chase Centre,Pennsylvania,USA]からの一種の寄贈品であり、2mM L−グルタミン、50μg/ml ゲンタマイシン及び10% 胎児ウシ血清が補足されたRPMI 1640培地中で培養された。ヒトLovo結腸腺ガン細胞系は、Dr.M.Grandi[Pharmacia−Fice,Nerviano,Milano,Italy]からの一種の寄贈品であり、2mM L−グルタミン、50μg/ml ゲンタマイシン、1% ビタミン類(BME)及び10% 胎児ウシ血清が補足されたHAM’s F12培地中で培養された。細胞は慣例的に、加湿された5% CO2雰囲気中で37℃において、単層培養物として保持された。ヒトK562/C1,000白血病細胞系は、Dr.H.Heyligen[Dr.Willems Instituut,Diepenbeek,Belgium]による一種の寄贈品であり、コルヒチンの増加する濃度において細胞を培養することにより得られるP−糖タンパク質発現性細胞系である。細胞は、2mM L−グルタミン、50μg/ml ゲンタマイシン及び5% 胎児ウシ血清が補足されたRPMI 1640培地中で、加湿された5% CO2雰囲気下に37℃において懸濁培養物として保持された。ヒトK562A7白血病細胞系は、Dr.H.Heyligenによる一種の寄贈品であり、K562/C1,000細胞の親の薬剤感受性細胞系である。K562/C1,000+細胞系は、K562/C1,000細胞を1μM コルヒチンと一緒にさらに2週間培養することにより得られた。この処理はより多量のP−糖タンパク質及びmRNAならびにより安定な耐性側面を誘導する。細胞は、2mM L−グルタミン、50μg/ml ゲンタマイシン及び5% 胎児ウシ血清が補足されたRPMI 1640培地中で、加湿された5% CO2雰囲気下に37℃において懸濁培養物として保たれた。ヒト大細胞肺ガン細胞系はECACC(European Collection of Cell Cultures,Salisbury,U.K.)から得た。COR−L23は親の薬剤感受性細胞系であり、COR−L23/Rは多剤耐性タンパク質−発現性多剤耐性−変異型であり、増加する濃度のドキソルビシンと一緒にCOR−L23細胞を連続段階的試験管内インキュベーションすることにより発現した。両細胞系のための培地は2mM L−グルタミン、50μg/ml ゲンタマイシン及び10% 胎児ウシ血清が補足されたRPMI 1640から成った。細胞は慣例的に、加湿された5% CO2雰囲気中で37℃において単層培養物として保持された。
細胞増殖アッセイ
細胞増殖アッセイは記載されている通りに行なわれた(A critical assessment of the use of microculture Tetrazolium assays to measure cell growth and function(Mossman,T.J.Immunol Meth 65:55−63,(1983))。
Claims (11)
- 製薬学的に許容され得る担体及び活性成分として請求項1に記載の化合物の治療的に有効な量を含んでなる製薬学的組成物。
- 請求項1に記載の化合物の治療的に有効な量を製薬学的に許容され得る担体と緊密に混合する請求項2に記載の製薬学的組成物の調製法。
- 式(I)の化合物を生産できる微生物の株を培養し、培養ブロスから式(I)の化合物を回収し、場合により回収された化合物を塩化することを含んでなる請求項1に記載の式(I)の化合物の生産法であって、
ここで該微生物が、ミクロモノスポラ属JS1035寄託番号LMG P−21525またはミクロモノスポラ属JS1044寄託番号LMG P−21526である、上記生産法。 - 薬剤としての使用のための請求項1に従う化合物。
- 腫瘍細胞増殖の阻止のための薬剤の製造における請求項1に従う化合物の使用。
- 請求項1に記載の式(I)の化合物を有効成分として含んでなる、ガンの処置のための医薬組成物。
- 抗腫瘍活性を有するミクロモノスポラ属JS1035寄託番号LMG P−21525から単離される、請求項1に従う化合物。
- 化合物が853の分子量及びC47H67NO13の分子式を有する請求項8に記載の化合物。
- 寄託番号LMG P−21525の下に寄託される微生物。
- 寄託番号LMG P−21526の下に寄託される微生物。
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EP1521765A1 (en) | 2005-04-13 |
EP1521765B1 (en) | 2016-02-24 |
CA2489041C (en) | 2012-06-05 |
WO2004005311A1 (en) | 2004-01-15 |
AU2003251730B2 (en) | 2009-04-30 |
US20050245598A1 (en) | 2005-11-03 |
JP2005534680A (ja) | 2005-11-17 |
CA2489041A1 (en) | 2004-01-15 |
ES2571778T3 (es) | 2016-05-26 |
US7803600B2 (en) | 2010-09-28 |
US7214705B2 (en) | 2007-05-08 |
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