JP2015509381A - 多能性幹細胞の増殖及び維持のための明確な培地 - Google Patents
多能性幹細胞の増殖及び維持のための明確な培地 Download PDFInfo
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Abstract
Description
本明細書は、全ての目的のために、その全てが参考文献によって本明細書に組み込まれている、2012年3月7日に出願された、米国特許仮出願明細書第61/607,706号の優先権を主張する。
本発明は、明確な培地条件下、多能性幹細胞の増殖及び維持の領域に関する。
幹細胞は、単独の細胞レベルで自己複製し、分化して後代細胞を生成するという、これらの両方の能力で定義される未分化細胞であり、後代細胞には、自己複製前駆細胞、非再生前駆細胞、及び最終分化細胞が含まれる。幹細胞はまた、インビトロで複数の胚葉層(内胚葉、中胚葉及び外胚葉)から様々な細胞系の機能的細胞へと分化する能力によって、また移植後に複数の胚葉層の組織を生じ、胚盤胞への注入後、すべてではないとしても殆どの組織を提供する能力によっても、特徴付けられる。
多能性幹細胞の特徴付け
多能性幹細胞は、ステージ特異的胚抗原(SSEA)3及び4、並びにTra−1−60及びTra−1−81と呼ばれる抗体によって検出可能なマーカーのうちの1つ以上を発現している(Thomsonら、Science 282:1145,1998)。インビトロでの多能性幹細胞の分化は、結果として、SSEA−4、Tra 1−60の欠損、Tra1−81発現(存在するならば)、及びSSEA−1の発現の増加となる。未分化多能性幹細胞は典型的に、アルカリホスファターゼ活性を有し、この活性は、製造業者(Vector Laboratories,Burlingame CA)によって記述されたように、4%パラホルムアルデヒドでの細胞の固定と、続く基質としてのVector Redとの発現によって検出可能である。未分化の多能性幹細胞はまた、RT−PCRにより検出されるように、一般にOCT4及びTERTも発現する。
使用が可能な多能性幹細胞の種類としては、妊娠期間中の任意の時期(必ずしもではないが、通常は妊娠約10〜12週よりも前)に採取した前胚性組織(例えば胚盤胞など)、胚性組織又は胎児組織などの、妊娠後に形成される組織に由来する多能性細胞の樹立株が含まれる。非限定例として、例えばヒト胚幹細胞株H1、H7、及びH9(WiCell Research Institute,Madison、WI)のような、ヒト胚性幹細胞又はヒト胚芽細胞の樹立株が挙げられる。更に、こうした細胞の初期の株化又は安定化の際に本開示の組成物を使用することも考えられるが、その場合は、供給源となる細胞は供給源の組織から直接採取される1次多能性細胞である。フィーダー細胞の不在下で既に培養された多能性幹細胞集団から採取した細胞も好適である。また、誘導可能多能性細胞(IPS)、又はOCT4、Nanog、Sox2、KLF4、及びZFP42のような多数の多能性関連転写因子の強制発現を用いて、成体体性細胞より誘導可能な再プログラムされた多能性細胞も好適である(Annu Rev Genomics Hum Genet,2011,12:165〜185)。
未分化胚性幹細胞の増殖用の最適な培地成分を同定するための、種々の培養条件の試験
mTeSR(登録商標)1培地(StemCell Technologies,Vancouver,Canada)中、MATRIGEL(商標)(1:30希釈、BD Biosciences,Franklin Lakes,NJ)コートディッシュ上で培養し、EDTAを用いて継代した、ヒト胚性幹細胞株H1(少なくとも35継代〜40継代)の細胞を開始集団として使用して、種々の培地成分を試験した。細胞を、室温にて5〜10分間EDTA処理を用いて、小コロニーとして継代した。培養を、それぞれの継代にて、1:6〜1:10の比で常用に分割した。表Iは、それらの未分化形態及び多様性マーカーを維持する一方で、H1細胞を増殖させるそれらの能力について試験した初期培地処方を記載している。
多能性に寄与する表面及び内部マーカーの評価を使用して、多能性の維持における被検処方の影響を査定した。表IIIにて示したように、5継代にて、IH−1及びIH−3中で培養した細胞は、mTeSR(登録商標)1培地中で増殖した培養と同様の表面マーカープロファイルを示した。しかしながら、10継代まで、IH−3培地中で培養したH1細胞は、SSEA−4の発現の有意な低下と、TRA1−60及び1−81の発現の穏やかな低下を示した。10継代IH−1培地中で培養したH1細胞は、mTeSR(登録商標)1培地中で培養したものと同様の発現パターンを維持した。
アスコルビン酸をスパイクしたIH−3培地中のH1細胞の培養が、未分化胚性幹細胞の主要な特徴を回復する
IH−3中で培養したH1対IH−1及びmTeSR(登録商標)1培地中で培養したものに対するSSEA−4及びZPF42における降下の理由を同定するために、ギャップ解析を実施し、mTeSR(登録商標)1及びIH−1中では存在し、IH−3培地中では存在しない主要な試薬を同定した。IH−3培地には、表Vにて示したように、Trace Elements C、アスコルビン酸、塩酸リチウム、又は明確な脂質を補った。
IH−3及びIH−1培地中のH1細胞の長期培養が、多能性及び安定核型を維持する
実施例1にて記述したように、mTeSR(登録商標)1培地中、MATRIGEL(商標)(1:30希釈)コートディッシュ上で培養し、EDTAを用いて継代した、ヒト胚性幹細胞株H1の細胞(継代35〜継代40)を開始集団として用いて、IH−1、IH−3−2及びmTeSR(登録商標)1培地を用いた長期培養を評価した。細胞を、室温にて5〜10分間EDTA処理を用いて、小コロニーとして継代した。被検培地の成分を、表VIIにて記載する。
IH−1、IH−3、及びmTeSR(登録商標)1培地中で培養したH1細胞に関する等価増殖率
先の被検培地中で培養した細胞の増殖率を比較するために、IH−1、IH−3−2及びmTeSR(登録商標)1培地中で培養したH1細胞を、TrypLE(Invitrogen)を用いることによって放出し、5×105細胞/10cm MATRIGEL(商標)−コートディッシュの密度にて播いた。単一細胞のアポトーシスを減少させ、接着を増強するために、放出した細胞を、10μM Rock阻害剤(Sigma)で前処理した。培地を、播種後3日まで、毎日交換した。3日目、細胞を単一細胞として放出し、ヘモサイトメーターを用いて計数した。表Xに示されるように、すべての3つの培地処方中で培養した細胞が、等価の倍加時間を示した。
高品質脂肪酸を含まないBSAは多能性細胞の増殖を許容する
mTeSR(登録商標)1培地中、MATRIGEL(商標)(1:30希釈)コートディッシュ上で培養し、EDTAを用いて継代した、ヒト胚性幹細胞株H1の細胞(継代35〜継代40)を、開始集団として使用して、2% Sigma BSA(カタログ番号A2153;ロット:061M1804V)又は脂肪酸を含まないBSA(Proliant、カタログ番号7500804、ロット:11G54001)のいずれかを補ったIH−3−2培地を用いて、短期培養を評価した。細胞を、室温にて5〜10分間EDTA処理を用いて、小コロニーとして継代した。図14A及び図14Bは、Sigma BSA(図14A)又は脂肪酸を含まないBSA(図14B)を含む培地処方中、4日間培養したH1細胞の位相コントラスト画像を表す。図15A及び図15Bは、Sigma BSA(図15A)又は脂肪酸を含まないBSA(図15B)を含む培地処方中、3継代培養したH1細胞の位相コントラスト画像を表す。図14Aにて見られるように、早ければ播種後4日に、Sigma BSAを用いた培養中、分化細胞の形態学的な証拠が存在した。しかしながら、脂肪酸を含まないBSAで処理した培養中、グロス分化細胞形態学的な証拠は存在しなかった(図14Bを参照のこと)。同一の傾向が3継代にて留意され、Sigma BSAを用いた培養中、分化細胞の形態学的証拠が存在した(図15Aを参照のこと)一方で、脂肪酸を含まないBSAを含む培地中で培養した細胞中、グロス分化細胞形態学的証拠は存在しなかった(図15Bを参照のこと)。更に、試薬グレード脂肪酸BSAを含む培地中で培養した細胞と比較して、Sigma BSAを含む培地中で培養した細胞の培養密度における有意な降下が存在した(図15Aと図15Bを比較)。
多能性幹細胞は、広範囲の濃度の脂肪酸を含まないBSA及びbFGFを用いた、IH−3培地中、増殖可能であり、多能性を維持可能である。
Claims (17)
- 多能性幹細胞の培養、維持及び増殖のための明確な細胞培養処方であって、前記細胞培養処方は基本培地、インスリン、トランスフェリン、セレン、脂肪酸を含まないアルブミン、TGF−βリガンド、bFGF、及びアスコルビン酸を含み、前記細胞培養処方中で幹細胞を培養することによって、少なくとも10継代、細胞の多能性と、核型安定性が維持される、細胞培養処方。
- 前記細胞培養処方が更に、インスリン増殖因子1(IGF−1)を含む、請求項1に記載の明確な細胞培養処方。
- 前記細胞培養処方が、DMEM−F12を含む、請求項1又は2に記載の明確な細胞培養処方。
- 前記細胞培養処方が更に、Trace Elements C、4−(2−ヒドロキシエチル)−1−ピペラジンエタンスルホン酸、塩化リチウム、グルコース、明確な脂質及びL−アラニル−L−グルタミンジペプチドを含む、請求項1に記載の明確な細胞培養処方。
- 前記細胞培養処方が、MCDB−131を含む、請求項4に記載の明確な細胞培養処方。
- ITS−Xが、インスリン、トランスフェリン、及びセレンを供給する、請求項1〜5のいずれか一項に記載の明確な細胞培養処方。
- 前記脂肪酸を含まないアルブミンが、試薬グレードである、請求項1〜6のいずれか一項に記載の明確な細胞培養処方。
- 前記TGF−βリガンドが、TGF−β1である、請求項1〜7のいずれか一項に記載の明確な細胞培養処方。
- DMEM−F12基本培地、インスリン、トランスフェリン、セレン、脂肪酸を含まないアルブミン、TGF−βリガンド、bFGF、及びIGF−1から本質的になる、明確な細胞培養処方。
- DMEM−F12基本培地、インスリン、トランスフェリン、セレン、脂肪酸を含まないアルブミン、TGF−βリガンド、bFGF、IGF−1、及びアスコルビン酸から本質的になる、明確な細胞培養処方。
- MCDB−131、Trace Elements C、アスコルビン酸、4−(2−ヒドロキシエチル)−1−ピペラジンエタンスルホン酸、塩化リチウム、グルコース、明確な脂質、インスリン、トランスフェリン、セレン、脂肪酸を含まないアルブミン、TGF−βリガンド、bFGF、及びL−アラニル−L−グルタミンジペプチドから本質的になる、明確な細胞培養処方。
- ヒト多能性幹細胞の増殖のための方法であって、明確な細胞培養処方中、フィーダーを含まないマトリックス上で、ヒト多能性幹細胞を培養する工程を含み、前記明確な細胞培養処方が、基本培地、インスリン、トランスフェリン、セレン、脂肪酸を含まないアルブミン、TGF−βリガンド、bFGF、及びアスコルビン酸を含み、前記明確な細胞培養処方中で幹細胞を培養することによって、少なくとも10継代、細胞の多能性と、核型安定性が維持される、方法。
- 前記明確な細胞培養処方が更に、インスリン増殖因子1(IGF−1)を含む、請求項12に記載の方法。
- 前記細胞培養処方が、DMEM−F12を含む、請求項12又は13に記載の方法。
- 前記明確な細胞培養処方が更に、Trace Elements C、4−(2−ヒドロキシエチル)−1−ピペラジンエタンスルホン酸、塩化リチウム、グルコース、明確な脂質、及びL−アラニル−L−グルタミンジペプチドを含む、請求項12に記載の方法。
- 前記明確な細胞培養処方が、MCDB−131を含む、請求項15に記載の方法。
- ITS−X、脂肪酸を含まないアルブミン、TGF−B1、bFGF、及びIGF−1を含むDMEM/F12培地中で培養した多能性細胞のインビトロ集団であって、前記集団中の細胞の少なくとも70%が、Oct4+、NANOG+、SOX2+、KI67+、FOXA2+及びZFP42−である、多能性細胞のインビトロ集団。
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JP7414326B2 (ja) | 2019-09-17 | 2024-01-16 | 通化安睿特生物製薬股▲フェン▼有限公司 | ヒトアルブミン含有製剤及びその製造方法 |
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RU2018128383A3 (ja) | 2019-04-15 |
KR20140131999A (ko) | 2014-11-14 |
WO2013134378A1 (en) | 2013-09-12 |
MX2014010782A (es) | 2014-10-14 |
RU2018128383A (ru) | 2019-03-14 |
US9593307B2 (en) | 2017-03-14 |
IN2014DN07036A (ja) | 2015-04-10 |
CA2866590A1 (en) | 2013-09-12 |
AU2018260810A1 (en) | 2018-11-22 |
US20160251615A1 (en) | 2016-09-01 |
RU2664467C2 (ru) | 2018-08-17 |
AU2013230020B2 (en) | 2018-08-09 |
ZA201407241B (en) | 2016-05-25 |
EP2823037A1 (en) | 2015-01-14 |
US9434920B2 (en) | 2016-09-06 |
AR090276A1 (es) | 2014-10-29 |
MX354775B (es) | 2018-03-20 |
SG11201405052RA (en) | 2014-10-30 |
JP6383292B2 (ja) | 2018-08-29 |
RU2014140371A (ru) | 2016-04-27 |
PH12014501898A1 (en) | 2014-11-24 |
CN104160018A (zh) | 2014-11-19 |
EP2823037A4 (en) | 2015-09-16 |
AU2013230020A1 (en) | 2014-09-04 |
US20170183626A1 (en) | 2017-06-29 |
US20130236973A1 (en) | 2013-09-12 |
HK1206058A1 (en) | 2015-12-31 |
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