JP7256818B2 - 心筋細胞のシート化方法 - Google Patents
心筋細胞のシート化方法 Download PDFInfo
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Description
[1]多能性幹細胞から分化誘導された細胞を含む移植片を製造する方法であって;
(a)前記細胞を含む細胞集団を、培養基材上に播種する工程、および
(b)播種した細胞集団を、血小板溶解物を含む移植片形成媒体で移植片形成培養する工程、
を含む、前記方法。
[2]多能性幹細胞が、iPS細胞である、[1]の方法。
[3]移植片が、シート状細胞培養物である、[1]または[2]の方法。
[4]移植片形成媒体が、移植片に含まれる細胞種と異種の血清を含まない、[1]~[3]の方法。
[5]移植片形成媒体が、さらに細胞接着性成分を含む、[1]~[4]の方法。
[6]培養基材が、細胞接着性成分および/または血小板溶解物でコーティングされている、[1]~[5]の方法。
[7]細胞が、心筋細胞である、[1]~[6]の方法。
[8]iPS細胞から分化誘導した心筋細胞を含む移植片において該心筋細胞の拍動開始を早める方法であって、前記心筋細胞を含む細胞集団を、血小板溶解物を含む移植片形成媒体で移植片形成培養することを含む、前記方法。
本明細書において別様に定義されない限り、本明細書で用いる全ての技術用語および科学用語は、当業者が通常理解しているものと同じ意味を有する。本明細書中で参照する全ての特許、出願および他の出版物や情報は、その全体を参照により本明細書に援用する。また本明細書において参照された出版物と本明細書の記載に矛盾が生じた場合は、本明細書の記載が優先されるものとする。
(a)前記細胞を含む細胞集団を、培養基材上に播種する工程、および
(b)播種した細胞集団を、血小板溶解物を含む培地で移植片形成培養する工程、
を含む、前記方法に関する。
本開示の一側面は、iPS細胞から分化誘導された心筋細胞を含む高品質なシート状細胞培養物を製造する方法に関する。本開示の方法は、以下の工程(a)および(b)を含む:
(a)iPS細胞から分化誘導された心筋細胞を含む細胞集団を、培養基材上に播種する工程、および
(b)播種した細胞集団を、血小板溶解物を含むシート化媒体でシート化培養する工程。
かかる接着培養ステップにおいて、培養条件などは、通常の接着培養を行う場合の条件に準じてよい。例えば、市販の接着培養用培養容器を用いて、37℃、5%CO2条件下での培養などであってよい。細胞の播種密度は、細胞同士の接着および/または細胞と培養基材との接着の形成を妨げない密度であればいかなる密度であってもよく、例えばサブコンフルエントな密度であってもよいし、コンフルエントに達する密度またはそれ以上であってもよい。培養時間は、細胞同士の接着および/または細胞と培養基材との接着が形成される程度の時間であればよく、具体的には例えば2~168時間、2~144時間、2~120時間、2~96時間、2~72時間、2~48時間、2~24時間、2~12時間、2~6時間、2~4時間程度であればよい。
具体的な調製方法としては、例えば、血小板の集団を溶解させ、そこから血小板の粒子や膜などの夾雑物を除去して上清を得るなどの手段により調製できる。血小板の溶解は、化学的手段(例えばCaCl2の使用など)、浸透圧的手段(例えば蒸留水の使用など)、凍結融解手段、機械的破壊手段などの工程を介して達成することができる。夾雑物の除去は、遠心分離やろ過などの方法により達成することができる。
上記で得られた、ヒトiPS細胞から分化誘導した心筋細胞を含む細胞集団を用い、シート化培養条件を検討した。DMEM/F12培地に20%FBSまたは5%ヒト血小板溶解物をそれぞれ加えたものをシート化媒体とした。血小板溶解物を加えたシート化媒体には、さらに細胞接着性成分としてラミニン(iMatrix-511)をそれぞれ0.1μg/mL、0.25μg/mLまたは0.5μg/mL加えた。また、シート化培養の1日目のみ、シート化媒体にRhoキナーゼ阻害剤Y27632を加えた。心筋細胞を含む細胞集団は、1.5×106個/cm2の密度で温度応答性培養皿(UpCell(R)、セルシード)播種し、37℃、5%CO2の環境で3日間培養した。温度応答性培養皿は、培養液と同じもの(ただしY27632は含まない)を入れて、37℃で一晩インキュベートしてプレコーティングしたものを用いた。培養の後、培養皿から心筋細胞を含むシート状細胞培養物を剥離した 。
例1と同様に、DMEM/F12培地にラミニン(iMatrix-511)を0.1μg/mL加えたものと、それにさらに5%の血小板溶解物を加えたものをそれぞれシート化媒体として、シート化培養を行った。
結果を図1に示す。シート化培養2日目におけるシート化成功率を比較したところPL群では100%成功していたのに対し、無血清培地では50%であった。
Claims (6)
- 多能性幹細胞から分化誘導された心筋細胞を含む移植片を製造する方法であって;
(a)前記細胞を含む細胞集団を、培養基材上に播種する工程、および
(b)播種した細胞集団を、血小板溶解物およびラミニンを含む移植片形成媒体で移植片形成培養する工程、
を含む、前記方法。 - 多能性幹細胞が、iPS細胞である、請求項1に記載の方法。
- 移植片が、シート状細胞培養物である、請求項1または2に記載の方法。
- 移植片形成媒体が、移植片に含まれる細胞種と異種の血清を含まない、請求項1~3のいずれか一項に記載の方法。
- 培養基材が、細胞接着性成分および/または血小板溶解物でコーティングされている、請求項1~4のいずれか一項に記載の方法。
- iPS細胞から分化誘導した心筋細胞を含む移植片において該心筋細胞の拍動開始を早める方法であって、前記心筋細胞を含む細胞集団を、血小板溶解物およびラミニンを含む移植片形成媒体で移植片形成培養することを含む、前記方法。
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WO2012043814A1 (ja) | 2010-09-30 | 2012-04-05 | 国立大学法人東京大学 | ヒト由来の多能性幹細胞を分化させる方法 |
WO2016076368A1 (ja) | 2014-11-12 | 2016-05-19 | テルモ株式会社 | 心筋細胞シート |
WO2017010544A1 (ja) | 2015-07-15 | 2017-01-19 | テルモ株式会社 | 多能性幹細胞または脂肪組織もしくは骨髄由来の間葉系幹細胞由来の心筋細胞の凍結保存方法 |
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WO2016076368A1 (ja) | 2014-11-12 | 2016-05-19 | テルモ株式会社 | 心筋細胞シート |
WO2017010544A1 (ja) | 2015-07-15 | 2017-01-19 | テルモ株式会社 | 多能性幹細胞または脂肪組織もしくは骨髄由来の間葉系幹細胞由来の心筋細胞の凍結保存方法 |
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