JP7107595B2 - 多能性幹細胞由来結膜細胞の誘導方法 - Google Patents
多能性幹細胞由来結膜細胞の誘導方法 Download PDFInfo
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Description
〔1〕 多能性幹細胞のコロニーをEGF(Epidermal Growth Factor)シグナル伝達活性化因子を含む培地にて培養して分化誘導させることを特徴とする、結膜上皮細胞、結膜杯細胞ならびに結膜上皮幹・前駆細胞の誘導方法。
〔2〕 多能性幹細胞のコロニーをEGFシグナル伝達活性化因子を含む培地にて培養し、SEAM細胞集団(self-formed ectodermal autonomous multi-zone細胞集団)を形成させる、前記〔1〕記載の誘導方法。
〔3〕 多能性幹細胞のコロニーをEGF(Epidermal Growth Factor)シグナル伝達活性化因子を含む培地にて培養してSEAM細胞集団(self-formed ectodermal autonomous multi-zone細胞集団)を形成させ、前記SEAM細胞集団から、ITGβ4、SSEA-4及びCD200の抗体の発現程度を指標にして細胞を単離することを特徴とする、結膜上皮細胞、結膜杯細胞ならびに結膜上皮幹・前駆細胞の製造方法。
〔4〕 単離した細胞がCD200陰性である、前記〔3〕記載の製造方法。
〔5〕 単離した細胞がSSEA-4弱陽性/ITGβ4陽性細胞である、前記〔3〕又は〔4〕記載の製造方法。
〔6〕 単離された細胞が結膜上皮幹・前駆細胞である、前記〔5〕記載の製造方法。
〔7〕 単離した細胞がSSEA-4弱陽性/ITGβ4陰性細胞及びSSEA-4陽性/ITGβ4陰性細胞から選ばれる、前記〔3〕又は〔4〕記載の製造方法。
〔8〕 単離された細胞が結膜上皮細胞及び/又は結膜杯細胞である、前記〔7〕記載の製造方法。
〔9〕 前記〔1〕~〔6〕いずれか記載の方法により得られた結膜上皮幹・前駆細胞をKGF(Keratinocyte Growth Factor)を含む培地にて培養する工程を含む、結膜上皮細胞シートの製造方法。
〔10〕 前記〔1〕~〔6〕いずれか記載の方法により得られた結膜上皮幹・前駆細胞をFGFR2b(Fibroblast Growth Factor Receptor 2b)活性化因子を含む培地にて培養する工程を含む、結膜上皮細胞シートの製造方法。
〔11〕 前記〔1〕~〔8〕いずれか記載の方法により得られた結膜上皮細胞、結膜杯細胞及び/又は結膜上皮幹・前駆細胞を培養する工程を含む、結膜に関連する疾患の薬剤スクリーニング方法。
iPS細胞からの分化誘導には、self-formed ectodermal autonomous multi-zone(SEAM)法を用いた(Hayashi et al. Nature. 2016 Mar 17;531(7594):376-80., Hayashi et al., Nature Protocols, 2017, 12(4), 683-696, doi: 10.1038/nprot.2017.007)。
実施例1で得られたSEAM細胞集団から、セルソーターSH800(SONY)にてソーティングしてCD200陰性細胞を抽出後、SSEA-4、ITGβ4にて展開し、図2に示す6つの画分に分画した。各画分の定義は、SSEA4-陰性/ITGβ4陽性細胞(P1画分)、SSEA-4弱陽性/ITGβ4陽性細胞(P2画分)、SSEA-4陽性/ITGβ4陽性細胞(P3画分)、SSEA-4陰性/ITGβ4陰性細胞(P4画分)、SSEA-4弱陽性/ITGβ4陰性細胞(P5画分)、SSEA-4陽性/ITGβ4陰性細胞(P6画分)の通りである。
実施例2で得られた6つの画分それぞれを、QIAzol Lysis Reagent(QIAGEN)を用いて回収し、RT-qPCRに供し、各種マーカー発現を評価した。結果を図3に示す。なお、図中、P4画分由来細胞(n=3)、その他の画分由来細胞(n=5)の結果であり、エラーバーは標準誤差を示した。
実施例2で抽出されたP5・6画分由来細胞を、BD Cytofix/Cytoperm(登録商標)Kit(554714、BD Biosciences)にて固定、膜透過処理後、DMEM/F12培地に50,000cells/mLとなるよう懸濁し、200μL/カラムとして、サイトスピン(A78300003、Thermo Fisher Scientific)にてスライドに細胞標本を作製した。続いて、5%NST(5% Normal Donkey Serum, 0.3% Tritonを含むTBS;T903、TaKaRa Bio)でブロッキング(室温、1時間)後に、抗MUC5AC抗体(1:200;sc-21701、Santa Cruz Biotechnology)、抗K13抗体(1:200;ab16112、abcam)、抗K12抗体(1:200;sc-17098、Santa Cruz Biotechnology)、抗PAX6抗体(1:300;PRB-278P、COVANCE)を用いて1次抗体反応(4℃、overnight)を行った。TBSにて5分間、2回洗浄後、Alexa Fluor 488、Alexa Fluor 568またはAlexa Fluor 647で標識した2次抗体(1:200;Life Technologies)及びHoechst33342(1:100;H3570、Molecular Probes)で処理(室温、1時間)後、蛍光顕微鏡で観察した。結果を図4に示す。
実施例2と同様にして得られたP2画分由来細胞を、ラミニン511E8フラグメント(0.5μg/cm2)でコーティングした細胞培養用インサート上で2~3週間培養した。培養には、KGF培地〔10ng/mL KGF(Wako)、10μM Y-27632及び2% B27 Supplement、及び1% penicillin-streptomycin solutionを含有させたDMEM/F-12〕またはEGF培地〔10ng/mL EGF、10μM Y-27632及び2% B27 Supplement、及び1% penicillin-streptomycin solutionを含有させたDMEM/F-12〕を使用した。
実施例1において、結膜用分化培地におけるEGFを、transforming growth factorα(TGFα)又はamphi-regulin(AR)に変更する以外は、実施例1と同様にして分化誘導を行なった。その後、実施例2と同様にしてP2画分由来細胞を抽出後、実施例5と同様にしてKGF培地で培養し、得られた細胞シートの染色を行なってMUC5ACの発現を確認した。
実施例5において、結膜上皮幹・前駆細胞の培養培地におけるKGFを、FGFR2b活性化因子(FGF10)に変更する以外は、実施例5と同様にして培養し、得られた細胞シートを実施例3と同様にしてRT-qPCRに供して、MUC5ACの発現量を評価した。
Claims (11)
- 多能性幹細胞のコロニーをEGF(Epidermal Growth Factor)シグナル伝達活性化因子を含む培地にて培養して分化誘導させることを特徴とする、結膜上皮細胞、結膜杯細胞ならびに結膜上皮幹・前駆細胞の誘導方法。
- 多能性幹細胞のコロニーをEGFシグナル伝達活性化因子を含む培地にて培養し、SEAM細胞集団(self-formed ectodermal autonomous multi-zone細胞集団)を形成させる、請求項1記載の誘導方法。
- 多能性幹細胞のコロニーをEGF(Epidermal Growth Factor)シグナル伝達活性化因子を含む培地にて培養してSEAM細胞集団(self-formed ectodermal autonomous multi-zone細胞集団)を形成させ、前記SEAM細胞集団から、ITGβ4、SSEA-4及びCD200の発現程度を指標にして細胞を単離することを特徴とする、結膜上皮細胞、結膜杯細胞ならびに結膜上皮幹・前駆細胞の製造方法。
- 単離した細胞がCD200陰性である、請求項3記載の製造方法。
- 単離した細胞がSSEA-4弱陽性/ITGβ4陽性細胞である、請求項3又は4記載の製造方法。
- 単離された細胞が結膜上皮幹・前駆細胞である、請求項5記載の製造方法。
- 単離した細胞がSSEA-4弱陽性/ITGβ4陰性細胞及びSSEA-4陽性/ITGβ4陰性細胞から選ばれる、請求項3又は4記載の製造方法。
- 単離された細胞が結膜上皮細胞及び/又は結膜杯細胞である、請求項7記載の製造方法。
- 請求項3~6いずれか記載の方法により結膜上皮幹・前駆細胞を製造する工程、及び得られた結膜上皮幹・前駆細胞をKGF(Keratinocyte Growth Factor)を含む培地にて培養する工程を含む、結膜上皮細胞シートの製造方法。
- 請求項3~6いずれか記載の方法により結膜上皮幹・前駆細胞を製造する工程、及び得られた結膜上皮幹・前駆細胞をFGFR2b(Fibroblast Growth Factor Receptor 2b)活性化因子を含む培地にて培養する工程を含む、結膜上皮細胞シートの製造方法。
- 請求項3~8いずれか記載の方法により結膜上皮細胞、結膜杯細胞及び/又は結膜上皮幹・前駆細胞を製造する工程、及び得られた結膜上皮細胞、結膜杯細胞及び/又は結膜上皮幹・前駆細胞を培養する工程を含む、結膜に関連する疾患の薬剤スクリーニング方法。
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