JP2020022460A - 多能性哺乳動物幹細胞に由来する心筋細胞を成熟させるための培地組成物 - Google Patents
多能性哺乳動物幹細胞に由来する心筋細胞を成熟させるための培地組成物 Download PDFInfo
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Abstract
Description
以下の説明及び実施例中に多数の用語が使用されている。その用語に与えられるべき範囲を含めた明細書及び特許請求の範囲の明瞭且つ一貫した理解を与えるために、以下の定義を提示する。本明細書中に別段の定義がない限り、すべての技術的及び科学的用語は、本発明が属する当業者が一般的に理解しているのと同一の意味を有する。刊行物、特許出願明細書、特許文献及び他の参考文献は全体として参照により本明細書に組み入れられる。
%のアルブミンを含み得、例えばBovogen(オーストラリア国キラー・イーストVIC 3033,Williams Ave)製のBovostar BSAからなり得る。血清の使用に対する技術的欠点には、既知ではない血清の種類、組成のバッチ間変動及び汚染のリスクが含まれる。高純度アルブミンのような既知の血清由来産物を存在させることにより、上記欠点が無血清培地中に再導入されない。
第1の態様において、本発明は水ベースの水性培地組成物に関する。特に、本発明は、本質的に無血清であり且つ甲状腺ホルモン様化合物、脂質混合物及びカルニチン化合物を含む培地組成物に関する。
1つの実施形態では、本発明の培地組成物は約1.0〜約150ng/mlのT3、好ましくは約10〜約125ng/mlのT3、好ましくは約25〜約100ng/mlのT3、好ましくは約30〜約75ng/mlのT3、好ましくは約40〜約60ng/mlのT3、好ましくは約53〜約55ng/mlのT3を含む。
第2の態様において、本発明は、PESC及び/またはiPSC、特にPESC及び/またはiPSCから分化した胎児様心筋細胞から成体様心筋細胞を作製するための方法に関し、その方法は、
(a)PESC及び/またはiPSCに由来する1つ以上の胎児様心筋細胞を用意する段階;
(b)前記胎児様心筋細胞を本明細書中に教示されている培地組成物と接触させて、前記胎児様心筋細胞を成体様心筋細胞に成熟させる段階;
を含む。
第3の態様において、本発明は本明細書中に教示されている培地組成物の好適な使用に関する。
第4の態様において、本発明は、本明細書中に教示されている培地組成物を含むインビトロ培養で成体様心筋細胞を作製するのに好適なキットに関する。
ヒトPESC(hPESC)またはヒトiPSC(hiPSC)を幹細胞培地において有糸分裂的に不活化させたマウス線維芽細胞上で培養し、TrypLE Select(Invitrogen)を用いて経代させた。幹細胞培養は、DMEM/F12(Gibco,カタログ番号11320−033)、20%(v/v)ノックアウト血清代替物(Gibco,カタログ番号10828−028)、10mM 非必須アミノ酸(Gibco,カタログ番号11140−050)、2mM L−グルタミン(Gibco,カタログ番号25030−081)、2b−メルカプトエタノール(Gibco,カタログ番号21985−023)、10ng/mlのヒトbFGFを含有している。
ヒトPESCまたはヒトiPSCをDambrotら(2014),Exp.Cell.Res.(印刷中)(http://dx.doi.Org/10.1016/j.yexcr.2014.05.001)に記載されている方法に従って単層で培養した。要するに、細胞をマトリゲル(BD Biosciences)被覆した組織培養皿を用いてmTeSRIにおいて製造業者のプロトコル(Stem Cell Technologies)に従って培養した。心筋細胞への分化を開始させるために、細胞を細胞の小クラスターに解離し、マトリゲル被覆した組織培養皿を用いてmTeSRIに接種した。3日後(分化日(d)0)、培地を低インスリン(1mg/l)の(LI)−BPEL培地と交換し、BMP4(0日目〜3日目)、アクチビンA(0日目〜3日目)、CHIR99021(0日目〜3日目)及びXAV939(3日目〜6日目)を補充した。6日目以降は、BMP4、アクチビンA、CHIR99021及びXAV939は培地に存在させなかった。
組織培養プラスチックをDMEM中1/100の濃度でマトリゲル(Corning)を用いて室温で45分間被覆した。いずれもインビトロ培養でPESC及び/またはiPSCに由来する解離胚様体、解離単層、または(商業的に入手した)凍結胎児様(未熟)心筋細胞に由来する単細胞懸濁液をマトリゲル被覆した組織培養プラスチックに適切な濃度(例えば、96ウェルプレートの1ウェルあたり20〜40k細胞、例えば12ウェルプレートの1ウェルあたり20〜200k)で接種した。平板培養から1日目に、胎児様(未熟)心筋細胞を本発明の培地組成物に曝した。前記培地組成物は、46.5重量%のIMDM(Gibco 21056)及びグルタマックス(Gibco 31765)を有している46.5重量%のHAM F−12中に50ng/mlのT3(Sigma T6397)、2mMのカルニチン、5mMのクレアチン、5mMのタウリン、2.2μg/mlのコレステロール、0.1μg/mlのリノール酸、0.1μg/mlのリノレン酸、0.1μg/mlのパルミチン酸(脂質,例えばGibco 11905から)、10mg/mlのインスリン、5.5mg/mlのトランスフェリン、0.0067mg/mlのセレン(インスリン、トランスフェリン及びセレン,例えばGibco 51500から)、0.01%の微量元素ミックスB(本明細書中に記載されている;Cellgro 99−175−CL)、0.1%の微量元素ミックスC(本明細書中に記載されている;Cellgro 99−176−CL)、0.5重量%の抗生物質(Gibcoから市販されているペニシリン−ストレプトマイシン混合物(Gibco 12070;5000U/ML))、0.05mg/mlのアスコルビン酸、2mMのグルタマックスサプリメント(すなわち、0.85% NaCl中L−アラニル−L−グルタミンジペプチド,Gibcoで市販されている,例えばGibco 35050)、0.125重量%のポリビニルアルコール(PVA)、450nMのαモノチオールグリセロール(MTG)(市販されている)、0.25重量%のBSA(Bovostar BSAS1.0)を含む無血清培地組成物から構成されている。濃度はすべて培地組成物中の最終濃度として表示されている。
インビトロ培養でPESCに由来する胎児様(未熟)心筋細胞を2つの実験群に分けた。第1群は本明細書中に教示されている、ただしT3を欠いている培地組成物(対照状況)に曝した。第2群は本明細書中に教示されている、ただしT3(100ng/ml)を含む培地組成物に曝した。両群をそれぞれの培地組成物において5日間インキュベートした。処理の終わりに、両実験群からの心筋細胞を4% パラホルムアルデヒドで固定し、リン酸緩衝食塩液(PBS)/0.1% トリトンX−100(Sigma−Aldrich)を用いて透過処理し、リン酸緩衝食塩液(PBS)/0.1% トリトンX−100(Sigma−Aldrich)1% BSAを用いてブロックした。サンプルをα−アクチニンに対して特異的な一次抗体(Eptomics Ab 68167)を(1/400の濃度で)用いて室温で1時間インキュベートした。一次抗体をCy3−またはAlexa−Fluor 647コンジュゲートした二次抗体を(1/250の濃度で)用いて検出した。像をLeica SP5−STEDまたはLeica SP5共焦点レーザー走査型顕微鏡(Leica Microsystems)を用いて取得した。
インビトロ培養でPESCに由来する胎児様(未熟)心筋細胞を2つの実験群に分けた。第1群は本明細書中に教示されている、ただしT3を欠いている培地組成物(対照状況)に曝した。第2群は本明細書中に教示されている、ただしT3(100ng/ml)を含む培地組成物に曝した。両群をそれぞれの培地組成物において12日間インキュベートした。処理期間の終わりに、両実験群からの胎児様(未熟)心筋細胞をパッチクランプ法にかけた。
インビトロ培養でPESCに由来する胎児様(未熟)心筋細胞を2つの実験群に分けた。第1群は本明細書中に教示されている、ただしT3を欠いている培地組成物(対照状況)に曝した。第2群は本明細書中に教示されている、ただしT3(100ng/ml)を含む培地組成物に曝した。両群をそれぞれの培地組成物において17日間インキュベートした。測定の前の日にある量の5nM TMRM(Invitrogen)をそれぞれの培地に添加した。細胞を5×Trypleを用いて解離したが、すべての溶液中にTMRMを含め、測定中も存在させた。測定はMiltenyi MACSquant VYBフローサイトメトリーを用いて実施した。
Claims (28)
- 水性培地組成物が無血清であり、甲状腺ホルモン様化合物、脂質混合物及びカルニチン化合物を含む、前記水性培地組成物。
- 前記甲状腺ホルモン様化合物が、トリヨードサイロニン(T3)及び/または3,5−ジヨードチロプロピオン酸(DITPA)である、請求項1に記載の組成物。
- 前記組成物が、約25ng/mlから約150ng/mlのT3及び/または約1μMから約2μMのDITPAを含む、請求項1または2に記載の組成物。
- 前記脂質混合物が、コレステロール、及びリノレン酸、リノール酸及びパルミチン酸から選択される1つ以上の脂質を含む、請求項1から3のいずれか1項に記載の組成物。
- 前記組成物が、約1μg/mlから約4μg/mlのコレステロールを含む、請求項1から4のいずれか1項に記載組成物。
- 前記脂質混合物が、更にアラキドン酸、酢酸DL−α−トコフェロール、エチルアルコール、ミリスチン酸、オレイン酸、パルミトレイン酸、プルロニックF−68、ステアリン酸及びトゥイーン(Tween)80の群から選択される1つ以上の成分を含む、請求項1から5のいずれか1項に記載の組成物。
- 前記組成物が、約0.5mMから約3.5mMのカルニチンを含む、請求項1から6のいずれか1項に記載の組成物。
- 前記組成物が、クレアチン化合物及びタウリン化合物を含む、請求項1から7のいずれか1項に記載の組成物。
- 前記組成物が、約3.0mMから約7.0mMのクレアチンを含む、請求項1から8のいずれか1項に記載の組成物。
- 前記組成物が、約2mMから約7mMのタウリンを含む、請求項1から9のいずれか1項に記載の組成物。
- 前記組成物が、約5mg/Lから約15mg/Lのインスリン、及び約3mg/Lから約8mg/Lのトランスフェリン並びに約0.005mg/Lから約0.0075mg/Lのセレンを含む、請求項1から10のいずれか1項に記載の組成物。
- 前記組成物が、Mn、Si、Mb、V、Ni、Sn、Al、Ag、Ba、K、Cd、Co、Cr、F、Ge、I、Rb及びZrの群から選択される微量元素の1つ以上、好ましくはすべてを含む、請求項1から11のいずれか1項に記載の組成物。
- 前記組成物が、約2mg/mlから約7mg/mlのポリビニルアルコール(PVA)を含む、請求項1から12のいずれか1項に記載の組成物。
- 前記組成物が、ウシ血清アルブミン、グルコース、ビタミン、抗生物質、モノチオールグリセロール、グルタミン、アミノ酸及びハムF12栄養ミックスを含む、請求項1から13のいずれか1項に記載の組成物。
- 請求項1から14のいずれか1項に記載の組成物を得るために水溶液中に溶解され得る固体組成物、好ましくは粉末組成物。
- 多能性胚性幹細胞(PESC)及び/または人工多能性幹細胞(iPSC)から分化した胎児様心筋細胞から成体様心筋細胞を作製するための方法であって、その方法は、
(a)1つ以上の胎児様心筋細胞を用意する段階;
(b)前記胎児様心筋細胞を請求項1から15に記載の培地組成物と接触させて、前記胎児様心筋細胞を成体様心筋細胞に成熟させる段階;
を含む前記方法。 - 前記胎児様心筋細胞を前記培地組成物と約3日間〜最長約15日間接触させる、請求項16に記載の方法。
- 前記培地組成物が、段階(b)の液体培地を得るために水溶液中に溶解され得る固体形態、好ましくは粉末形態である、請求項16及び17に記載の方法。
- 前記胎児様心筋細胞を、甲状腺ホルモン様化合物を欠いている請求項1から15のいずれか1項に記載の培地組成物と約2日間接触させた後、少なくとも1つの甲状腺ホルモン様化合物を含んでいる請求項1から15のいずれか1項に記載の培地組成物と接触させる、請求項16から18のいずれか1項に記載の方法。
- インビトロでPESC及び/またはiPSCに由来する心筋細胞を成熟させるための請求項1から15のいずれか1項に記載の組成物の使用。
- インビトロでPESC及び/またはiPSCに由来する心筋細胞を成熟させるための請求項1から15のいずれか1項に記載の、ただし甲状腺ホルモン様化合物を欠いている組成物の使用。
- 請求項1から15のいずれか1項に記載の培地組成物を含む、インビトロ培養で成体様心筋細胞を作製するのに適したキット。
- 請求項1から15のいずれか1項に記載の、ただし少なくとも1つの甲状腺ホルモン様化合物を欠いている培地組成物を含む、請求項22に記載のキット。
- 前記培地組成物が液体形態である、請求項22及び23に記載のキット。
- 前記培地組成物が、固体形態、好ましくは粉末形態である、請求項22及び23に記載のキット。
- 胎児様心筋細胞を含む、請求項20から25のいずれか1項に記載のキット。
- 未分化PESC及び/またはiPSCを含む、請求項20から25のいずれか1項に記載のキット。
- 請求項16から19に記載の成体様心筋細胞を作製する方法の説明書を含む、請求項20から25のいずれか1項に記載のキット。
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