JP7083190B2 - 制御性t細胞の作製法 - Google Patents
制御性t細胞の作製法 Download PDFInfo
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- JP7083190B2 JP7083190B2 JP2020538435A JP2020538435A JP7083190B2 JP 7083190 B2 JP7083190 B2 JP 7083190B2 JP 2020538435 A JP2020538435 A JP 2020538435A JP 2020538435 A JP2020538435 A JP 2020538435A JP 7083190 B2 JP7083190 B2 JP 7083190B2
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Description
本願は、末梢T細胞から制御性T細胞を誘導する方法を提供する。
本態様においては、得られた細胞培養物をさらに、IL-2を含む培地で培養する工程を含んでいてもよい。
以下の実施例において、RPMI1640(10% FCS (v/v), 60 μg/mL penicillin G, 100 μg/mL streptomycin, 0.1 mM 2-mercaptoethanolを含有)を基礎培地として用いた。
誘導された細胞よりゲノムDNAを取得し、MethylEasy Xceed Rapid DNA Bisulphite Modification Kit (Human Genetic Signatures)を用いて処理後、制御性T細胞に特徴的な遺伝子の脱メチル化について、調べた。各遺伝子の脱メチル化の解析は、既知の方法およびプライマーを用いた(Floess et al.(2007) PloS Biology Volume 5, Issue 2, e38、およびOhkura et al.(2012) Immunity 37(5) 785-799)。
また、マウスFoxp3 CNS2領域の解析においてはプライマーとしてフォワード側に5'-ATTTGAATTGGATATGGTTTGT-3'(配列番号1)、リバース側に5'-AACCTTAAACCCCTCTAACATC-3'(配列番号2)を用い、ヒトFoxp3 CNS2領域の解析においてはフォワード側に5'-TTGGGTTAAGTTTGTTGTAGGATAG-3'(配列番号3)、リバース側に5'-ATCTAAACCCTATTATCACAACCCC-3'(配列番号4)を用いた。
Foxp3-eGFP (eFox)レポーターマウス(Ito et al.(2014) Science 346, 363-368)を用いた。Foxp3-eGFP(eFox)レポーターマウスのリンパ節細胞を得、FACSAriaII (BD)によりCD4+GFP+ 細胞をソートすることによって内在性制御性T細胞(nTreg)画分を得た。CD4+GFP-CD44lowCD62Lhigh 細胞をソートしてナイーブT細胞画分を得た。さらにCD4+GFP-CD44highCD62Llow細胞画分を得、エフェクター/メモリーT細胞として用いた。
eFoxレポーターマウスのリンパ節からFACSによってマウスナイーブT細胞を得た。96ウェルプレート(Nunc)中に2x105細胞/ウェルのマウスナイーブT細胞を播種し、抗CD28抗体存在下(最終濃度1μg/mlとなるように培地に添加)または非存在下において、抗CD3抗体(10μg/ml濃度の抗体をウェル当たり100μL添加し、室温で60分間静置することで容器へ固相化)、hIL-2(50U/ml)、hTGFβ1(2.5 ng/ml)を含む基礎培地で3日間刺激した。その後Foxp3陽性細胞をFACSで分離し、バイサルファイトシーケンスを行った(図1)。Foxp3、CTLA4、Eos、Heliosの制御性T細胞特異的な脱メチル化部位、および共通してメチル化されている部位について解析を行った。抗CD28抗体を含む条件では、制御性T細胞特異的な脱メチル化部位の脱メチル化はほとんど起こらなかった。一方、抗CD28抗体を含まない条件では脱メチル化が起こっており、より内在性制御性T細胞に近い性質を持つ制御性T細胞が得られたことが確認された。
実施例1と同じ実験系において、アスコルビン酸を基礎培地に10μg/mlまたは30μg/ml加えてアスコルビン酸の効果を調べた。結果を図3に示す。アスコルビン酸を添加すると、脱メチル化の程度がさらに上昇することが確認された。
実施例2と同じ実験系により制御性T細胞を得た。得られた制御性T細胞にCD3/CD28 Dynabeadsを細胞数:ビーズ=1:1となるように添加し、抗CD3/抗CD28抗体で再刺激した。再刺激時、再刺激の1日後、2日後および3日後におけるFoxp3の安定性を調べた(図4)。CD28刺激なしで誘導した制御性T細胞は、再刺激によるFoxp3の発現量の変化が少なく、Foxp3を安定に発現していることが確認された。また、再刺激時および再刺激の3日後における表面分子マーカーの発現を調べた(図6)。再刺激の3日後においても、制御性T細胞の表面分子マーカーであるCTLA4、GITR、CD25およびc-Relはいずれも安定に発現していた。
実施例1の方法で作製した制御性T細胞をさらにIL-2のみを含む基礎培地で2日間または4日間培養(安定化培養)した。CD28刺激なしで誘導した制御性T細胞は安定化培養後においてもFoxp3を安定に発現していることが確認された(図7)。
ヒトCD4+CD25-CD45RA+T細胞(ヒトT細胞)を抗CD3抗体、抗CD28抗体、およびIL-2を含む基礎培地で3日間刺激した。その後IL-2のみを添加した基礎培地で4日間前処理培養した。前処理培養後の細胞または未処理のヒトT細胞を、抗CD28抗体存在下(最終濃度1μg/mlとなるように培地に添加)または非存在下において、抗CD3抗体(10μg/ml濃度の抗体をウェル当たり100μL添加し、室温で60分間静置することで容器へ固相化)の存在下、IL-2(50U/ml)、TGF-β(2.5ng/ml)、抗IFN-g抗体(最終濃度1μg/mL)、抗IL-4抗体(最終濃度1μg/mL)、抗IL-6抗体(最終濃度1μg/mL)、抗Fasリガンド抗体(最終濃度1μg/mL)およびCTLA4-Ig(最終濃度1μg/mL)を含む基礎培地で3日間刺激した。その後、Foxp3陽性細胞をFACSにて回収し、バイサルファイトシーケンスを行いFoxp3のCNS2領域の脱メチル化を調べた。結果を図12に示す。
前処理培養を行わない条件では、Foxp3の脱メチル化はほとんど起こらなかった。一方、前処理培養後にCD28刺激なしで培養することで、Foxp3 CNS2領域の脱メチル化が確認された。この結果から、ヒトT細胞においても、あらかじめ前処理培養を行うことで安定な制御性T細胞を製造できることが確認された。また、マウスと同様にアスコルビン酸による脱メチル化効果も認められた(図13)。
Claims (7)
- 哺乳動物由来の末梢T細胞を、CD3刺激の存在下、CD28刺激の不存在下でTGFβ、IL-2およびアスコルビン酸を含む培地で培養する工程を含む、制御性T細胞の製造方法。
- 哺乳動物由来の末梢T細胞を、CD3刺激の存在下、CD28刺激の不存在下でTGFβおよびIL-2を含む培地で培養する工程、および
得られた細胞培養物を、IL-2を含む培地で培養する工程を含む、制御性T細胞の製造方法。 - (1-1)哺乳動物由来の末梢T細胞をCD3刺激およびCD28刺激の存在下、IL-2を含む培地で培養する工程、
(1-2)得られた培養物を、IL-2を含む培地で培養する工程、および
(2)得られた培養物を、CD3刺激の存在下、CD28刺激の不存在下でTGFβおよびIL-2を含む培地で培養する工程を含む、制御性T細胞の製造方法。 - (2)の工程において、培地がさらにアスコルビン酸を含む、請求項3に記載の方法。
- (2)の工程で得られた培養物を、IL-2を含む培地で培養する工程をさらに含む、請求項3または4に記載の方法。
- 哺乳動物由来の末梢T細胞が、ヒト由来の末梢T細胞である、請求項3~5のいずれかに記載の方法。
- ヒト由来の末梢T細胞が、ヒト末梢血単核球である、請求項6記載の方法。
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