JPWO2016072519A1 - 未分化細胞が除去された分化誘導細胞集団、その利用及びその製造方法 - Google Patents
未分化細胞が除去された分化誘導細胞集団、その利用及びその製造方法 Download PDFInfo
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- JPWO2016072519A1 JPWO2016072519A1 JP2016557838A JP2016557838A JPWO2016072519A1 JP WO2016072519 A1 JPWO2016072519 A1 JP WO2016072519A1 JP 2016557838 A JP2016557838 A JP 2016557838A JP 2016557838 A JP2016557838 A JP 2016557838A JP WO2016072519 A1 JPWO2016072519 A1 JP WO2016072519A1
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Abstract
Description
多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団であって、未分化多能性幹細胞の含有割合が、0.2%以下である細胞集団。
項1−2.
前記多能性幹細胞が、人工多能性幹細胞又は胚性幹細胞である、項1−1に記載の細胞集団。
項1−3.
前記人工多能性幹細胞が、iPS細胞である、項1−2に記載の細胞集団。
項1−4.
前記胚性幹細胞が、ES細胞である、項1−2に記載の細胞集団。
項1−5.
総細胞数が、1×104個以上である、項1−1〜1−4のいずれか一項に記載の細胞集団。
項1−6.
前記未分化多能性幹細胞の含有割合が、フローサイトメトリーを用いた未分化細胞マーカー解析により求められるものである、項1−1〜1−5のいずれか一項に記載の細胞集団。
項1−7.
医薬として用いられる、項1−1〜1−6のいずれか一項に記載の細胞集団。
項2−1.
多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法であって、
(A)抗CD30抗体結合薬剤の存在下で、多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団を培養することにより、未分化多能性幹細胞の含有割合を低減する工程;及び/又は
(B)BET阻害剤の存在下で、多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団を培養することにより、未分化多能性幹細胞の含有割合を低減する工程
を含む、製造方法。
項2−2.
前記多能性幹細胞が、人工多能性幹細胞又は胚性幹細胞である、項2−1に記載の製造方法。
項2−3.
前記人工多能性幹細胞が、iPS細胞である、項2−2に記載の製造方法。
項2−4.
前記胚性幹細胞が、ES細胞である、項2−2に記載の製造方法。
項3−1.
多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法において、未分化多能性幹細胞の含有割合を低減するために用いられる、抗CD30抗体結合薬剤を含有する組成物。
項3−2.
多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法において、未分化多能性幹細胞の含有割合を低減するために用いられる、BET阻害剤を含有する組成物。
本発明は、多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団であって、未分化多能性幹細胞の含有割合が、0.2%以下である細胞集団である。
本発明の細胞集団は、未分化多能性幹細胞の含有割合が、好ましくは0.1%以下であり、より好ましくは0.05%以下である。
本発明の細胞集団は、特に限定されないが、以下に説明する方法により得ることができる。必要に応じて、これらの方法を組み合わせて行ってもよい。これらの方法は、いずれも不可避的に混入する未分化多能性幹細胞を除去する技術に属し、従来の方法では実現できなかったレベルにまで未分化多能性幹細胞の含有割合を低減することができる新しい方法である。
この方法では、未分化細胞マーカーとして知られるCD30を特異的に認識する抗体からなる抗CD30抗体結合薬剤を用いる。
また、リンカーとしては、特に限定されないが、例えば、蛋白質分解酵素により開裂するリンカー等が挙げられる。
この方法では、ヒストンアセチル化阻害剤であるBET阻害剤を用いる。
3.本発明の組成物
本発明はさらに、上記の方法のために用いられる、以下の組成物を提供する。
(a)抗CD30抗体結合薬剤を含有する組成物;
(b)BET阻害剤を含有する組成物;及び
(c)抗CD30抗体結合薬剤及びBET阻害剤を含有する組成物。
これらの組成物における、抗CD30抗体結合薬剤及び/又はBET阻害剤の配合濃度は、特に限定されず、要求される保存安定性や使用目的等に応じて適宜設定することができる。
これらの組成物は、上記の方法を阻害しない限りにおいて、さらに他の成分を含有していてもよい。その他の成分としては、特に限定されないが、例えば、グルコース、マルトース、シュークロース、ラクトース、ラフィノース、トレハロース、マンニトール、ヒドロキシエチル澱粉及びプルラン等の糖質、グルコン酸、乳酸、酢酸、プロピオン酸、β−ヒドロキシ酪酸及びクエン酸等の有機酸、塩化ナトリウム、塩化カリウム、塩化マグネシウム、塩化カルシウム、リン酸二水素ナトリウム、リン酸二水素カリウム、リン酸水素二ナトリウム、リン酸水素二カリウム、炭酸水素ナトリウム、炭酸水素カリウム、炭酸ナトリウム及び炭酸カリウム等の電解質、L−アスコルビン酸及びビタミンE等のビタミン、グリシン、グルタミン酸及びリジン等のアミノ酸、抗利尿ホルモン及びインスリン等のホルモン、クエン酸、クエン酸塩、ヘパリン及びエデト酸ナトリウム等の抗凝固剤、カルシウム拮抗剤、アドレナリンβ受容体拮抗剤及びアンギオテンシン変換酵素阻害剤等の降圧剤、アデノシン三リン酸等の核酸塩基、凍結防止蛋白質等の凍結防止剤;並びに活性酸素消去剤、細胞賦活剤、抗生物質、抗血小板因子、肝障害抑制剤、賦形剤、結合剤、崩壊剤、分散剤、粘性剤、再吸収促進剤、界面活性剤、溶解補助剤、保存剤、防腐剤、乳化剤、等張化剤、安定化剤、緩衝剤及びpH調整剤等が挙げられ、これらの少なくとも一種を必要に応じて配合することができる。
ヒトiPS細胞株MYH−GIP4を12穴プレートへ播種した(細胞密度:20% confluency)。播種48時間後、各ウェルに抗CD30抗体結合薬剤(一般名:Breutuximab vedotin、BVと略す)(商品名:Adcetris(登録商標))を0、0.05及び5μg/mlずつ添加(24時間毎に薬剤含有培地を交換)。以後、24時間毎に顕微鏡下に観察した。なお、Adcetris(登録商標)には、BVの他、添加物が含まれる為、BV正味の重量をもとに換算した数値を記載した。すなわち「BVとして0、0.05及び5μg/ml」となる。
種々のBV濃度、BV処理時間で、ヒトiPS細胞の細胞数がどのように変化するかを明らかにする目的で、in vitroでヒトiPS細胞にBVを添加し、細胞数を反映する細胞増殖アッセイ (CCK−8アッセイ)を行い、生細胞の評価を定量的に行った。
種々のBV濃度・BV処理時間で、ヒトiPS細胞の細胞数がどのように変化するかを明らかにする目的で、invitroでヒトiPS細胞にBVを添加し、細胞数を反映する細胞増殖アッセイ(CCK−8アッセイ)を行い、生細胞の評価を定量的に行った。
ヒトiPS細胞由来心筋細胞(iPS−CM)を対象とする。iPS−CMは心筋細胞の他、造腫瘍性を有する未分化細胞も含有すると考えられる。
BET阻害剤 (使用薬剤名:JQ1)がヒトiPS細胞およびヒト正常細胞(NHDF;Normal human dermal fibroblast)に及ぼす影響を調べる目的で、in vitroでヒトiPS細胞及びヒト正常細胞(NHDF)にJQ1を添加し、細胞増殖及び細胞死に関して肉眼的に観察した。
以後、96時間後に顕微鏡下に観察し、細胞を可視化するためにクリスタル・バイオレット染色を行った(図9)。
種々のJQ1濃度で、ヒトiPS細胞の細胞数がどのように変化するかを明らかにする目的で、in vitroでヒトiPS細胞にJQ1を添加し、細胞数を反映する細胞増殖アッセイ(CCK−8アッセイ)を96時間後に行い、生細胞の評価を定量的に行った。
以後、添加96時間後に細胞増殖アッセイを行った(図10)。
ヒト正常分化細胞(NHDF及びiPS−CM)に対してJQ1が毒性を有することがないかを調べる目的で、実施例6と同様の細胞増殖アッセイを行った。
ヒトiPS細胞株MYH−GIP4から誘導したiPS−CMを12穴プレートへ播種した(細胞密度:90% confluency)。播種48時間後、各ウェルにJQ1を0、1及び5μMlずつ添加(48時間毎に薬剤含有培地を交換)。以後、添加96時間後にTRA−1−60陽性率を定量化した。コントロールとして、Isotypecontrol抗体を用いて同様に測定を行い、擬陽性がないことを確認した。
Claims (10)
- 多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団であって、未分化多能性幹細胞の含有割合が、0.2%以下である細胞集団。
- 前記多能性幹細胞が、人工多能性幹細胞及び胚性幹細胞である、請求項1に記載の細胞集団。
- 前記人工多能性幹細胞が、iPS細胞である、請求項2に記載の細胞集団。
- 前記胚性幹細胞が、ES細胞である、請求項2に記載の細胞集団。
- 総細胞数が、1×104個以上である、請求項1〜4のいずれか一項に記載の細胞集団。
- 前記未分化多能性幹細胞の含有割合が、フローサイトメトリーを用いた未分化細胞マーカー解析により求められるものである、請求項1〜5のいずれか一項に記載の細胞集団。
- 医薬として用いられる、請求項1〜6のいずれか一項に記載の細胞集団。
- 多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法であって、
(A)抗CD30抗体結合薬剤の存在下で、多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団を培養することにより、未分化多能性幹細胞の含有割合を低減する工程;及び/又は
(B)BET阻害剤の存在下で、多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団を培養することにより、未分化多能性幹細胞の含有割合を低減する工程
を含む、製造方法。 - 多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法において、未分化多能性幹細胞の含有割合を低減するために用いられる、抗CD30抗体結合薬剤を含有する組成物。
- 多能性幹細胞を分化誘導することにより得られうる分化細胞を含有する細胞集団の製造方法において、未分化多能性幹細胞の含有割合を低減するために用いられる、BET阻害剤を含有する組成物。
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