JP6736003B2 - 多能性幹細胞からt細胞への誘導方法 - Google Patents
多能性幹細胞からt細胞への誘導方法 Download PDFInfo
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Description
このようなTリンパ球の補充療法として、抗原特異的なT細胞受容体(TCR)遺伝子を各種リンパ球系細胞に遺伝子導入し、特異的免疫反応を補充や賦活させることが提案されている(非特許文献1または2)。これらの試みでは遺伝子導入細胞として骨髄前駆細胞であるCD34陽性細胞や、ナイーブTリンパ球などが用いられているが、これらは、Ex−vivoでの自己再生能が低い、遺伝子導入の効率が低い、遺伝子導入による分化の調節が困難である、など多くの課題を有している。
また、iPS細胞などの多能性幹細胞から誘導したTリンパ球を用いた補充療法も提案されている(非特許文献3または特許文献1)。多能性幹細胞からTリンパ球の誘導方法においては、(1)多能性幹細胞から造血前駆細胞を誘導する工程、(2)造血前駆細胞からCD4CD8両陰性細胞を誘導する工程、(3)CD4CD8両陰性細胞からCD4CD8両陽性細胞を誘導する工程、および(4)CD4CD8両陽性細胞からTリンパ球を誘導する工程が提案されている。
(1)の工程では、多能性幹細胞からネット様構造物サック(ES−sac)を形成させ造血前駆細胞を製造する方法が知られている(非特許文献4)。また、(2)および(3)の工程は、OP9−DL1細胞層上でIL−7およびFlt−3Lを添加した培地で培養する方法が知られている(非特許文献5または6)。さらに、(4)の工程は、抗CD3抗体(OKT−3)およびIL−2を添加した培地で培養する方法が知られている。
しかし、これらの方法によって多能性幹細胞からTリンパ球を製造する効率は十分ではなく、改良が望まれている。
[1]以下の工程を含む、多能性幹細胞からCD8陽性T細胞を誘導する方法;
(1)多能性幹細胞を、ビタミンC類を添加した培養液中で培養し、造血前駆細胞を誘導する工程、
(2)前記工程(1)で得られた細胞を、ビタミンC類を添加した培養液中で培養し、CD4CD8両陽性T細胞を誘導する工程、および
(3)前記工程(2)で得られた細胞を、副腎皮質ホルモン剤を添加した培養液中で培養し、CD8陽性T細胞を誘導する工程。
[2]前記工程(3)において、培養液はさらにビタミンC類を含む、[1]に記載の方法。
[3]前記ビタミンC類が、リン酸ビタミンCである、[1]または[2]に記載の方法。[4]各工程において、ビタミンC類は1日毎に培養液へ補充される、[1]から[3]のいずれかに記載の方法。
[5]前記工程(1)において、多能性幹細胞はC3H10T1/2細胞上で培養される、[1]から[4]のいずれかに記載の方法。
[6]前記工程(1)が、5%以下の低酸素条件で行われる、[1]から[5]のいずれかに記載の方法。
[7]前記工程(1)において、培養液はさらにVEGF、SCFおよびFLT-3Lを含む、[1]から[6]のいずれかに記載の方法。
[8]前記工程(2)において、工程(1)で得られた細胞はOP9-DL1細胞上で培養される、[1]から[7]のいずれかに記載の方法。
[9]前記工程(2)において、培養液はさらにFLT-3L、およびIL-7を含む、[1]から[8]のいずれかに記載の方法。
[10]副腎皮質ホルモン剤を添加した培養液中でCD4CD8両陽性T細胞を培養する工程を含む、CD8陽性T細胞を誘導する方法。
[11]前記副腎皮質ホルモン剤がデキサメタゾンである、[10]に記載の方法。
[12]前記培養液は、さらに抗CD3抗体、ビタミンC類、IL-2およびIL-7を含む、[10]または[11]に記載の方法。
[13]前記ビタミンC類が、リン酸ビタミンCである、[12]に記載の方法。
[14]ビタミンC類を添加した培養液中で多能性幹細胞を培養する工程を含む、造血前駆細胞を誘導する方法。
[15]前記ビタミンC類が、リン酸ビタミンCである、[14]に記載の方法。
[16]ビタミンC類は1日毎に培養液に補充される、[14]または[15]に記載の方法。
[17]前記多能性幹細胞を培養する工程が、C3H10T1/2細胞上で多能性幹細胞を培養する工程である、[14]から[16]のいずれかに記載の方法。
[18]前記多能性幹細胞を培養する工程が、5%以下の低酸素条件で行われる、[14]から[17]のいずれかに記載の方法。
[19]前記培養液は、さらにVEGF、SCFおよびFLT-3Lを含む、[14]から[18]のいずれかに記載の方法。
本発明において多能性幹細胞とは、生体に存在する多くの細胞に分化可能である多能性を有し、かつ、増殖能をも併せもつ幹細胞であり、少なくとも本発明で使用される造血前駆細胞に誘導される任意の細胞が包含される。多能性幹細胞には、特に限定されないが、例えば、胚性幹(ES)細胞、核移植により得られるクローン胚由来の胚性幹(ntES)細胞、精子幹細胞(「GS細胞」)、胚性生殖細胞(「EG細胞」)、人工多能性幹(iPS)細胞、培養線維芽細胞や骨髄幹細胞由来の多能性細胞(Muse細胞)などが含まれる。好ましい多能性幹細胞は、製造工程において胚、卵子等の破壊をしないで入手可能であるという観点から、iPS細胞であり、より好ましくはヒトiPS細胞である。
本発明において、造血前駆細胞(Hematopoietic Progenitor Cells(HPC))とは、リンパ球、好酸球、好中球、好塩基球、赤血球、巨核球等の血球系細胞に分化可能な細胞である、本発明において、造血前駆細胞と造血幹細胞は、区別されるものではなく、特に断りがなければ同一の細胞を示す。造血幹細胞/前駆細胞は、例えば、表面抗原であるCD34および/またはCD43が陽性であることによって認識できる。
本発明において、CD4CD8両陽性T細胞とは、T細胞のうち、表面抗原のCD4およびCD8が共に陽性である細胞(CD8+CD4+)を意味し、T細胞は、表面抗原であるCD3およびCD45が陽性であることによって認識することができることから、CD4CD8両陽性T細胞は、CD4、CD8、CD3およびCD45が陽性である細胞として同定することができる。CD4CD8両陽性T細胞は、誘導によってCD4陽性細胞またはCD8陽性細胞へと分化させることができる。
本発明において、CD8陽性T細胞とは、T細胞のうち、表面抗原のCD8が陽性である細胞(CD8+CD4-)を意味し、細胞傷害性T細胞とも呼ばれる。T細胞は、表面抗原であるCD3およびCD45が陽性であることによって認識することができることから、CD8陽性T細胞は、CD8、CD3およびCD45が陽性であり、CD4が陰性である細胞として同定することができる。
iPS細胞(TKT3v 1-7株)は、Nishimura T, et al., Cell Stem Cell. 12(1):114-126, 2013に記載の方法を用いて、告知後に同意を得て単離されたヒトCD3陽性T細胞より樹立した。
C3H10T1/2細胞およびOP9-DL1細胞は、理化学研究所・理研 BioResource Center より入手して用いた。
10cm dishにおいてコンフルエントなC3H10T1/2細胞上にTKT3v 1-7株の小塊を播種し(Day0)、EB培地(15%ウシ胎児血清(FBS)、10μg/mL ヒトインスリン、5.5μg/mL ヒトトランスフェリン、5ng/mL 亜セレン酸ナトリウム、2mM L−グルタミンと、0.45mM α−モノチオグリセロール、および50μg/mL アスコルビン酸を添加したIMDM)中で、低酸素条件下(5% O2)にて7日間培養した(Day7)。
上記の方法で得られたDP細胞を24wellプレートに播種し、500ng/ml抗CD3抗体(OKT3)、10nM Dexamethasone(デキサートR Fuji Pharma)、15% FBS、2mM L−グルタミン、100U/ml ペニシリン、100ng/ml ストレプトマイシン、5.5μg/mL ヒトトランスフェリン、5ng/mL 亜セレン酸ナトリウム、50ng/ml L-Ascorbic acid 2-phosphate、Non essential Amino Acid、100U/ml IL-2、10ng/ml IL-7を添加したαMEM中で、3日間培養した。得られた細胞をFACSにて調べたところ、CD3(+) CD45(+) CD4(-) CD8(+) 分画細胞であることが確認された(図2)。
iPS細胞(GPC3株)は、Nishimura T, et al., Cell Stem Cell. 12(1):114-126, 2013に記載の方法を用いて、告知後に同意を得て単離されたヒトCD3陽性T細胞より樹立した。用いたヒトCD3陽性T細胞はCD8陽性のキラーT細胞であり、肝細胞がんでの発現が知られるGPC3抗原に特異的なT細胞受容体を持つ。
C3H10T1/2細胞上にGPC3株の小塊を播種し、実施例1と同様の方法にて培養し、CD4CD8両陽性を得た。さらに、得られたCD4CD8両陽性を実施例1と同様の方法にて培養し、CD8陽性細胞を誘導した。
GPC3株から上述の方法で誘導した細胞群をフローサイトメーターにてCD3、CD45、CD4、CD8α、CD8β、CD5およびCD7の発現を確認したところ、CD8αβ両陽性のCD8陽性細胞が誘導されることが確認された(図3)。
iPS細胞(4GAD 1-8株)は、Nishimura T, et al., Cell Stem Cell. 12(1):114-126, 2013に記載の方法を用いて、告知後に同意を得て単離されたヒトCD3陽性T細胞より樹立した。用いたヒトCD3陽性T細胞はCD4陽性のヘルパーT細胞であり、膵臓での発現が知られるGAD65抗原に特異的なT細胞受容体を持つ。
10cm dishにTKT3v 1-7株または4GAD 1-8株の小塊を播種し(Day0)、EB培地(15%ウシ胎児血清(FBS)、10μg/mL ヒトインスリン、5.5μg/mL ヒトトランスフェリン、5ng/mL 亜セレン酸ナトリウム、2mM L−グルタミン、0.45mM α-モノチオグリセロール、および50μg/mL アスコルビン酸を添加したIMDM)中で、低酸素条件下(5% O2)にて7日間培養した(Day7)。
GPC3株から上述の方法で誘導した細胞群をフローサイトメーターにてCD3、CD45、CD4、CD8α、CD8β、CD5およびCD7の発現を確認したところ、CD8αβ両陽性のCD8陽性細胞が誘導されることが確認された(図6)。
Claims (16)
- 以下の工程を含む、多能性幹細胞からCD8陽性T細胞を誘導する方法;
(1)多能性幹細胞を、ビタミンC類を添加した培養液中で培養し、造血前駆細胞を誘導
する工程、
(2)前記工程(1)で得られた細胞を、ビタミンC類を添加した培養液中で培養し、CD4CD8両陽性T細胞を誘導する工程、および
(3)前記工程(2)で得られた細胞を、糖質コルチコイドおよびその誘導体から選択される副腎皮質ホルモン剤を添加した培養液中で培養し、CD8陽性T細胞を誘導する工程。 - 前記工程(3)において、培養液はさらにビタミンC類を含む、請求項1に記載の方法。
- 前記ビタミンC類が、リン酸ビタミンCである、請求項1または2に記載の方法。
- 各工程において、ビタミンC類は1日毎に培養液へ補充される、請求項1から3のいずれ
か1項に記載の方法。 - 前記工程(1)において、多能性幹細胞はC3H10T1/2細胞上で培養される、請求項1から
4のいずれか1項に記載の方法。 - 前記工程(1)が、5%以下の低酸素条件で行われる、請求項1から5のいずれか1項に記載の方法。
- 前記工程(1)において、培養液はさらにvascular endothelial growth factor (VEGF
)、Stem cell factor (SCF)およびFlt3 Ligand (FLT-3L)を含む、請求項1から6のいずれか1項に記載の方法。 - 前記工程(2)において、工程(1)で得られた細胞はOP9-DL1細胞上で培養される、請
求項1から7のいずれか1項に記載の方法。 - 前記工程(2)において、培養液はさらにFLT-3L、およびinterleukin (IL)-7を含む、請求項1から8のいずれか1項に記載の方法。
- 前記副腎皮質ホルモン剤が、酢酸コルチゾン、ヒドロコルチゾン、酢酸フルドロコルチゾン、プレドニゾロン、トリアムシノロン、メチルプレドニゾロン、デキサメタゾン、ベタメタゾン、およびプロピオン酸ベクロメタゾンからなる群より選択される、糖質コルチコイドまたはその誘導体である、請求項1から9のいずれか1項に記載の方法。
- 前記副腎皮質ホルモン剤がデキサメタゾンである、請求項1から9のいずれか1項に記載の方法。
- 糖質コルチコイドおよびその誘導体から選択される副腎皮質ホルモン剤を添加した培養液中でCD4CD8両陽性T細胞を培養する工程を含む、CD8陽性T細胞を誘導する方法。
- 前記副腎皮質ホルモン剤が、酢酸コルチゾン、ヒドロコルチゾン、酢酸フルドロコルチゾン、プレドニゾロン、トリアムシノロン、メチルプレドニゾロン、デキサメタゾン、ベタメタゾン、およびプロピオン酸ベクロメタゾンからなる群より選択される、糖質コルチコイドまたはその誘導体である、請求項12に記載の方法。
- 前記副腎皮質ホルモン剤がデキサメタゾンである、請求項12に記載の方法。
- 前記培養液は、さらに抗CD3抗体、ビタミンC類、IL-2およびIL-7を含む、請求項12〜14のいずれか一項に記載の方法。
- 前記ビタミンC類が、リン酸ビタミンCである、請求項15に記載の方法。
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