JP6275646B2 - Mait様細胞およびその作製方法 - Google Patents
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Description
(1)MAIT細胞に初期化因子を導入してMAIT細胞特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞を得ること、次いで、この人工多能性幹細胞を分化誘導してMAIT様細胞を得ること、を含む、MAIT様細胞の作製方法。
(2)MAIT細胞に初期化因子を導入してMAIT細胞特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞を得ることを含む、人工多能性幹細胞の作製方法。
(3)ウイルスベクターを用いて初期化因子を導入する、(1)又は(2)に記載の方法。
(4)ウイルスベクターが、センダイウイルスベクターである、(3)に記載の方法。
(5)センダイウイルスベクターが、複数の初期化因子を同一のベクター内に搭載したものである、(4)に記載の方法。
(6)(2)〜(5)のいずれかに記載の方法によって得られる人工多能性幹細胞。
(7)MAIT細胞に特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞。
(8)TCRα鎖遺伝子として、MAIT細胞に特異的な態様に再構成された、単一のTCRα鎖遺伝子のみを保持する、(7)に記載の人工多能性幹細胞。
(9)MAIT細胞に特異的な態様に再構成されたTCRα鎖遺伝子が、ヒトの場合Vα7.2−J α33、マウスの場合Vα19−J α33である、(7)又は(8)に記載の人工多能性幹細胞。
(10) (2)〜(5)のいずれかの方法によって得られる、(7)〜(9)のいずれかに記載の多能性幹細胞。
(11) (6)〜(10)のいずれかに記載の人工多能性幹細胞を分化誘導してMAIT様細胞を得ることを含む、MAIT様細胞の作製方法。
(12) 前記人工多能性幹細胞をフィーダー細胞とともに共培養してMAIT様細胞を得る、(11)に記載の方法。
(13) (6)〜(10)のいずれかに記載の人工多能性幹細胞を分化誘導することによって得られるMAIT様細胞。
(14) (11)又は(12)に記載の方法によって得られるMAIT様細胞。
(15) CD45RAの発現が陽性である、(13)に記載のMAIT様細胞。
(16) (13)乃至(15)の何れかに記載のMAIT様細胞と被験物質を接触させる工程を含む、被験物質のMAIT細胞の機能を調整する活性の評価方法。
(17) (13)乃至(15)の何れかに記載のMAIT様細胞を含有する、細胞療法剤。
(18) 細菌感染又は真菌感染に対する抵抗力を向上させるために投与される、(17)の細胞療法剤。
ヒト臍帯血よりフィコールを用いて単核球細胞を調製した。この単核球細胞に、MAIT細胞のTCR(Vα7.2)を特異的に認識するモノクローナル抗体3C10(仏・キュリー研のOlivier Lantz博士の恵与、又はBiolegend社)をビオチン標識したものを混和させ、アビジン磁気ビーズを利用したMACSカラム(Miltenyi Biotech社製)を用いて3C10抗体に反応性を有する細胞をポジティブ選択することにより、MAIT細胞を濃縮した。この操作を、異なる3名のドナー由来の臍帯血を用いて行った結果、FACS解析により3C10陽性細胞として規定されるMAIT細胞は、それぞれ96%、88%、78%の純度であった。
実施例1で個別に樹立・単離されたMAIT−iPS細胞株である1−3D、2−5D、4−6Dは、MEFフィーダー上で単層かつ扁平で明確な輪郭のコロニーを呈し、一般的なヒトES/iPS細胞ときわめて良く似た形態を示した(図2A)。
Oct−3/4〔増幅サイズ:144bp〕
Nanog〔増幅サイズ:391bp〕
GAPDH(グリセルアルデヒド−3−リン酸デヒドロゲナーゼ)〔増幅サイズ:382bp〕
ES細胞等の幹細胞は、OP9細胞をフィーダー細胞とした共培養により、CD34陽性の血球/リンパ球前駆細胞に分化誘導することができ、さらにNotchリガンドであるDLL1を強制発現したOP9細胞(OP9/DLL1)と共培養することにより、T細胞系列の細胞に分化誘導させることができることが知られている(Schmitt TM et al.,Nat.Immun.5,410−417(2004);Wakao H et al.,FASEB J.22,2223−2231(2008);Wakao H et al.,WO2008/038579;Watarai H et al.,J.Clin.Invest.120,2610−2618(2010);WO2010/027094;Timmermans F et al.,J.Immunol.182,6879−6888(2011))。
Lantzらの一連の報告(Dusseaux et al.,2011)によると、生体内、特に末梢血に存在するMAIT細胞は、TCR Vα7.2、CD161、IL−18Rα以外にCD26(DPP−IV)やCD27、CD28、CD62L(L−selectin)、CD95(Fas)、CD127(IL−7Rα)、CD244(SLAMF4)といった細胞表面マーカーが陽性であることが知られている。そこで上述の方法に基づき、iMAIT細胞における、これらマーカーに特異的な抗体に対する反応性を調べた。
MAIT細胞の特徴として、CD3/TCRとCD28への共刺激シグナル(以下、CD3/CD28刺激)、又はホルボール12−ミリスタート13−アセテート(phorbol12−myristate 13−acetate:PMA)とイオノマイシン(Ionomycin)による刺激(以下、PMA/Iono刺激)によりインターフェロン(IFN)γ等のサイトカインを産生することが知られている(Dusseaux et al.,2011)。そこで、実施例2、3記載の方法に基づき作製したiMAIT細胞を、抗CD3抗体並びに抗CD28抗体でコートされた磁気ビーズ(Dynabeads Human T−Activator CD3/CD28;Invitrogen社)と混和培養してCD3/CD28刺激を48時間、行った。また、同様にiMAIT細胞培養系にPMA(10ng/mL;和光純薬社)とIonomycin(1μM;和光純薬社)を添加してPMA/Iono刺激を48時間行った。
iMAIT細胞が動物体内で、通常のMAIT細胞と同様の挙動を取り得るかを確認するため、事前に320cGyの放射線照射を行った8〜10週齢のNOD/scidマウス(Charles River社)に、実施例3で作製したiMAIT細胞(5×104個/匹)を経静脈投与により注入移植した。6〜10週後に安楽的に屠殺した後、骨髄や肝臓、脾臓、小腸上皮や粘膜固有層を摘出した。次に、当該臓器よりリンパ球を回収し、実施例3と同様のFCM法を用いて、リンパ球中のiMAIT細胞、即ち3C10+/TCRαβ+細胞の存在を調べた。
[配列表]
Claims (18)
- MAIT細胞に初期化因子を導入してMAIT細胞に特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞を得ること、次いで、
この人工多能性幹細胞を分化誘導してMAIT様細胞を得ること、
を含む、MAIT様細胞の作製方法。 - MAIT細胞に初期化因子を導入してMAIT細胞特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞を得ることを含む、人工多能性幹細胞の作製方法。
- ウイルスベクターを用いて初期化因子を導入する、請求項1又は2に記載の方法。
- ウイルスベクターが、センダイウイルスベクターである、請求項3に記載の方法。
- センダイウイルスベクターが、複数の初期化因子を同一のベクター内に搭載したものである、請求項4に記載の方法。
- 請求項2乃至5のいずれかに記載の方法によって得られる人工多能性幹細胞。
- MAIT細胞に特異的な態様に再構成されたTCRα鎖遺伝子を保持する人工多能性幹細胞。
- TCRα鎖遺伝子として、MAIT細胞に特異的な態様に再構成された、単一のTCRα鎖遺伝子のみを保持する、請求項7に記載の人工多能性幹細胞。
- MAIT細胞に特異的な態様に再構成されたTCRα鎖遺伝子が、ヒトの場合Vα7.2−J α33、マウスの場合Vα19−J α33である、請求項7又は8記載の人工多能性幹細胞。
- 請求項2乃至5のいずれかの方法によって得られる、請求項7乃至9のいずれかに記載の人工多能性幹細胞。
- 請求項6乃至10のいずれかに記載の人工多能性幹細胞を分化誘導してMAIT様細胞を得ることを含む、MAIT様細胞の作製方法。
- 前記人工多能性幹細胞をフィーダー細胞とともに共培養してMAIT様細胞を得る、請求項11に記載の方法。
- 請求項6乃至10のいずれかに記載の人工多能性幹細胞を分化誘導することによって得られるMAIT様細胞。
- 請求項11又は12に記載の方法によって得られるMAIT様細胞。
- CD45RAの発現が陽性である、請求項13に記載のMAIT様細胞。
- 請求項13乃至15の何れかに記載のMAIT様細胞と被験物質を接触させる工程を含む、被験物質のMAIT細胞の機能を調整する活性の評価方法。
- 請求項13乃至15の何れかに記載のMAIT様細胞を含有する、細胞療法剤。
- 細菌感染又は真菌感染に対する抵抗力を向上させるために投与される、請求項17の細胞療法剤。
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