JP7386848B2 - 改良されたレンチウイルスベクター - Google Patents
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Description
トランスフェクションされた前記宿主細胞を培養して、前記レンチウイルスベクターをレンチウイルスベクター粒子にパッケージングングするステップb)と、
ステップb)で生成されたレンチウイルスベクター粒子を取得するステップc)とを含む。
実施例における統計学的分析は、GraphPadソフトウェア(GraphPad Prism v5.0;GraphPad Software,San Diego,CA,USA)を使用して行う。対応のあるt検定を行った後、Newman-Keuls検定を行ってデータを解析する。結果を平均値±SEMとして示す。p値<0.05が有意であると考えられる。
CAR形質導入用レンチウイルスベクターは、所望のCARトランスジェニックを含み、細胞内で発現できるものでなければならない。それぞれ旧ベクターpPVLV1(図1A)と新ベクターpPVLV2(図1B)である、CARを発現するための第三世代レンチウイルスベクターを2種類設計した。pPVLV1は531bpの長いヒト伸長因子1α(EF1α)プロモーターを含み、pPVLV1は212bpの短いヒトEF1αプロモーターを含む。2種類のベクターに含まれる各エレメント及びその説明は、次の表1に記載される。
異なるプロモーターの影響をさらに証明するために、図3の2種のCAR-ルシフェラーゼレポーターベクターはpPVLV2に基づいて構築され、それらの違いはトランスジェニック発現を駆動するプロモーターのみであり、ここで、CAR-19はP2A-Fluc(ホタルルシフェラーゼ)カセットの上流にクローニングされ、ジシストロンを形成している(図3AとB)。
TGF-βは重要なT細胞抑制因子であり、標的細胞に対する治療用T細胞の殺傷作用を弱めたり消失させたりする可能性がある。臨床上、TGF-βは多くの腫瘍組織に広く発現し、腫瘍細胞に対する腫瘍特異的T細胞の殺傷活性を著しく抑制し、免疫治療が失敗する重要な原因である。一方、優性ネガティブTGF-βII型受容体(dominant negative TGF-βreceptor type II、DNRII)はTGF-βのネガティブ調節受容体であり、T細胞に対するTGF-βの抑制作用を抑制する。以下の実施例は、T細胞におけるCARとDNRIIの共発現の効果を検討する。DNRIIのアミノ酸配列はSEQ ID NO:17で示され、そのヌクレオチド配列はSEQ ID NO:18で示される。
T細胞に対するTFG-βの抑制作用は、TFG-βがその受容体に結合した後、SMAD2分子のリン酸化を行うことにより達成される。
IFN-γとTNF-αはT細胞が標的細胞を殺傷するマーカーサイトカインである。この2種のサイトカインの発現レベルが高いことは、標的細胞に対するT細胞の殺傷能力が高いことを示し、逆の場合は、殺傷能力が低いことを示している。
12日間形質導入したCAR-T-19細胞とCAR-T-19-DNRII細胞を用いて標的細胞殺傷実験を行った。
Claims (11)
- レンチウイルスベクターであって、
目的ポリペプチドをコードするヌクレオチド配列の宿主細胞における発現を指導するための、トランケートEF1αプロモーターを含み、前記トランケートEF1αプロモーターが、SEQ ID NO:13で示されるヌクレオチド配列からなるEF1αコアプロモーターであり、
前記レンチウイルスベクターは非複製型レンチウイルスベクターであり、
前記レンチウイルスベクターは、操作可能に連結された、5’LTR、ψエレメント、RREエレメント、cPPT/CTSエレメント、前記トランケートEF1αプロモーター、WPREエレメント、及び3’LTR、及び、目的ポリペプチドをコードするヌクレオチド配列を含み、
前記目的ポリペプチドは、第1のタンパク質と第2のタンパク質とを含む融合ポリペプチドであり、前記融合ポリペプチドは、第1のタンパク質と第2のタンパク質との間に自己切断ペプチドを含み、
前記第1のタンパク質は、癌関連抗原特異的T細胞受容体(TCR)又はキメラ型抗原受容体(CAR)であり、前記第2タンパク質は優性ネガティブTGF-βII型受容体である、レンチウイルスベクター。 - 前記5’LTRはSEQ ID NO:3又は11で示されるヌクレオチド配列を含み、前記ψエレメントはSEQ ID NO:4又は12で示されるヌクレオチド配列を含み、前記RREエレメントはSEQ ID NO:5で示されるヌクレオチド配列を含み、前記cPPT/CTSエレメントはSEQ ID NO:6で示されるヌクレオチド配列を含み、前記WPREエレメントはSEQ ID NO:9又は14で示されるヌクレオチド配列を含み、前記3’LTRはSEQ ID NO:10又は15で示されるヌクレオチド配列を含む、請求項1に記載のレンチウイルスベクター。
- 操作可能に連結された、SEQ ID NO:11で示されるヌクレオチド配列を含む5’LTR、SEQ ID NO:12で示されるヌクレオチド配列を含むψエレメント、SEQ ID NO:5で示されるヌクレオチド配列を含むRREエレメント、SEQ ID NO:6で示されるヌクレオチド配列を含むcPPT/CTSエレメント、SEQ ID NO:13で示されるヌクレオチド配列からなるトランケートEF1αプロモーター、SEQ ID NO:14で示されるヌクレオチド配列を含むWPREエレメント、SEQ ID NO:15で示されるヌクレオチド配列を含む3’LTR、及び、目的ポリペプチドをコードするヌクレオチド配列を含む、請求項1~2のいずれか1項に記載のレンチウイルスベクター。
- 前記目的ポリペプチドは、複数のタンパク質を含む融合ポリペプチドであり、前記融合ポリペプチド中の前記複数のタンパク質は、自己切断ペプチドによって分離されている、請求項1~3のいずれか1項に記載のレンチウイルスベクター。
- 前記自己切断ペプチドは2Aポリペプチドであり、たとえばP2A、F2A、E2A又はT2Aポリペプチド、又はその機能的バリアントから選択される、請求項1~4のいずれか1項に記載のレンチウイルスベクター。
- 前記優性ネガティブTGF-βII型受容体は、SEQ ID NO:18で示されるアミノ酸配列を含む、請求項1~5のいずれか1項に記載のレンチウイルスベクター。
- レンチウイルスベクター粒子の製造方法であって、
請求項1~6のいずれか1項に記載のレンチウイルスベクター、Gag及び/又はPolを発現する1種又は複数種のパッケージングベクター、VSV-Gなどのエンベロープタンパク質を発現するエンベロープベクターを適切な宿主細胞に共トランスフェクションさせるステップa)と、
トランスフェクションされた前記宿主細胞を培養して、前記レンチウイルスベクターをレンチウイルスベクター粒子にパッケージングングするステップb)と、
ステップb)で生成されたレンチウイルスベクター粒子を取得するステップc)と、を含む製造方法。 - レンチウイルスベクター粒子であって、
請求項1~6のいずれか1項に記載のレンチウイルスベクターを含む、レンチウイルスベクター粒子。 - 治療用T細胞の製造における、請求項8に記載のレンチウイルスベクター粒子の使用であって、
前記治療用T細胞は、癌関連抗原特異的T細胞受容体(TCR)又はキメラ型抗原受容体(CAR)、及び優性ネガティブTGF-βII型受容体を発現する使用。 - 請求項8に記載のレンチウイルスベクター粒子をT細胞に形質導入することを含む、治療用T細胞の製造方法。
- 前記治療用T細胞は、前記レンチウイルスベクター粒子の形質導入により、癌関連抗原特異的T細胞受容体(TCR)又はキメラ型抗原受容体(CAR)、及び場合によって優性ネガティブTGF-βII型受容体を発現する、請求項10に記載の方法。
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