JP2022511885A - ヒト抗antxrキメラ抗原受容体及びその用途 - Google Patents
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Abstract
Description
固形癌に特異的な遺伝子を確認するために、固形癌の中で膵癌に関連した組織を利用した。膵癌stage1 3人、stage3 89人、stage4 12人の合計104人の膵癌患者から分離した膵癌組織を準備した。その後、癌組織、IPMN組織、そして正常膵臓組織における遺伝子変化をマイクロアレイ(microarray)を用いて分析し、膵癌組織で発現の増加した6種の遺伝子を選抜した(表1)。
1)mRNA発現量が‘正常組織(normal)<IPMN組織<膵癌(PDAC)組織’である遺伝子
2)発現タンパク質が細胞表面に存在する遺伝子
3)正常組織から発現が殆ど見られない遺伝子
ANTXR1又はANTXR2に特異的なCARは、細胞外結合ドメイン、CD8αから由来した膜貫通ドメイン、G4S1(GGGGS)リンカー又はヒンジ領域、CD3ζ鎖の1次シグナル伝達ドメイン、CD28及びCD137を共刺激シグナル伝達ドメインとして含むように設計された。
実施例2で作製されたPA63リガンド;D4;D1+D4;D2+D4;D3+D4;D4+D4;D1+D2+D4;D2+D3+D4又はD1+D3+D4が導入されたCAR含有遺伝子が導入されたレンチウイルスを100MOIの濃度でCTL(Cytotoxic T lymphocyte)から分離した細胞傷害性T細胞クローン(Cytotocxicity T cell Clone)にそれぞれ形質導入させ、それぞれのCAR-T細胞を作製した。
実施例4-1:膵癌細胞株に対する細胞毒性確認
実施例3で作製されたD4含有CAR導入T細胞の膵癌細胞株(PANC-1、AsPC1)に対する抗癌細胞毒性を確認するために、それらを膵癌細胞株にそれぞれ処理した。
実施例3で作製されたD4含有CAR導入T細胞とD4+D4含有CAR導入T細胞の抗癌細胞毒性を確認するために、それらをそれぞれ膵癌細胞株及び黒色腫細胞株に処理した。
実施例2で作製されたD4含有CARが導入されたレンチウイルスを、3人の健康な供与者から分離したPBMCにそれぞれ形質導入させ、それぞれのCAR-T細胞を作製した。D4含有CAR導入T細胞の抗癌細胞毒性を確認するために、それらをそれぞれ黒色腫、膵癌及び乳癌細胞株に処理した。
膵癌細胞株であるPANC-1に蛍光を標示できるようにRFP遺伝子を導入して作製した細胞株(RFP(Red Fluorescence Protein)を発現させるPANC-1細胞株;PANC-1_RFP)を24ウェルプレートに1×104個の細胞ずつ分注した後、健康な供与者のPBMCで作製されたNT(non transduced)T細胞又はCAR(D4含有CAR-T)をそれぞれエフェクター(CAR-T):ターゲット(PANC-1)比=5(5×104):1、10(1×105):1、20(2×105):1、40(4×105):1個の細胞に48時間共培養した。24ウェルプレートに残っている膵癌細胞株(PANC-1_RFP)を回収し、フローサイトメトリーを用いてRFP陽性細胞カウンティング(RFP positive cell counting)をした。
免疫欠乏マウス(Balb/cヌード、雌、5週齢)に膵癌細胞株(Mia-PaCa2)を1×107cell/100μLで皮下注射(subcutaneous injection)した25日後に、PBSと健康な供与者のPBMCで作製されたNT(non transduced)、GFP only(empty vector)、CAR(D4含有CAR-T)を1×107cell/300uLの濃度で静脈注射(intravenous injection)した。細胞注入約4週後に、D4含有CAR-Tの腫瘍(tumor)は、対照群(PBS、NT、GFP only)に比べて80%の体積が減少した。このことから、ANTXR1又はANTXR2を発現させる固形癌腫を用いた動物モデルにおいてもCAR T効能が優れていることが確認できる(図14)。
Claims (20)
- 細胞外結合ドメイン(extracellular binding domain)、膜貫通ドメイン(transmembrane domain)及び細胞内シグナル伝達ドメイン(intracellular signaling domain)を含むキメラ抗原受容体(chimeric antigen receptor,CAR)をコードする核酸であって、前記細胞外結合ドメインは、ANTXR(anthrax toxin receptor)を認識することを特徴とする、キメラ抗原受容体をコードする核酸。
- 前記ANTXRを認識する細胞外結合ドメインは、ANTXRに特異的に結合する抗体、アプタマー又はリガンドであることを特徴とする、請求項1に記載の核酸。
- 前記リガンドは、PA63リガンド又はその断片であることを特徴とする、請求項2に記載の核酸。
- 前記PA63リガンドは、配列番号1のアミノ酸配列で表されることを特徴とする、請求項3に記載の核酸。
- 前記断片は、PA63リガンドのドメイン4又はドメイン4を含む断片であることを特徴とする、請求項3に記載の核酸。
- 前記PA63リガンドのドメイン4断片は、配列番号2のアミノ酸配列で表されることを特徴とする、請求項5に記載の核酸。
- 前記PA63リガンドのドメイン4を含む断片は、D1+D4;D2+D4;D3+D4;D4+D4;D1+D2+D4;D2+D3+D4;D1+D3+D4;D4+D4+D1;D4+D4+D2;D4+D4+D3;D4+D4+D1+D2;D4+D4+D1+D3;D4+D4+D2+D3;D4+D4+D4;D4+D4+D4+D1;D4+D4+D4+D2;D4+D4+D4+D3及びD4+D4+D4+D4からなる群から選ばれることを特徴とする、請求項5に記載の核酸。
- 前記PA63リガンドのドメイン4を含む断片は、配列番号2~配列番号9のアミノ酸配列からなる群から選ばれることを特徴とする、請求項7に記載の核酸。
- 前記ANTXRは、ARTXR1(anthrax toxin receptor 1)又はARTXR2(anthrax toxin receptor 2)であることを特徴とする、請求項1に記載の核酸。
- 前記膜貫通ドメインは、T-細胞受容体のアルファ、ベータ又はゼータ鎖、CD28、CD3エプシロン、CD45、CD4、CD5、CD8、CD9、CD16、CD22、CD33、CD37、CD64、CD80、CD86、CD134、CD137及びCD154からなる群から選ばれることを特徴とする、請求項1に記載の核酸。
- 前記細胞内シグナル伝達ドメインは、1次シグナル伝達ドメイン(primary signaling domain)及び共刺激シグナル伝達ドメイン(co-stimulatory signaling domain)を含むことを特徴とする、請求項1に記載の核酸。
- 前記1次シグナル伝達ドメインは、TCRζ、FcRγ、FcRβ、CD3γ、CD3δ、CD3ε、CD3ζ、CD22、CD79a、CD79b及びCD66dからなる群から選ばれることを特徴とする、請求項11に記載の核酸。
- 前記共刺激シグナル伝達ドメインは、OX40、CD2、CD27、CD28、CDS、ICAM-1、LFA-1(CD11a/CD18)、ICOS(CD278)及び4-1BB(CD137)からなる群から選ばれることを特徴とする、請求項11に記載の核酸。
- 請求項1~13のいずれか一項に記載のキメラ抗原受容体をコードする核酸を含むベクター。
- 前記ベクターは、DNA、RNA、プラスミド、レンチウイルスベクター、アデノウイルスベクター及びレトロウイルスベクターからなる群から選ばれることを特徴とする、請求項14に記載のベクター。
- 請求項14に記載のベクターを含む組換え細胞。
- 前記細胞は、T細胞又はNK細胞であることを特徴とする、請求項16に記載の組換え細胞。
- 前記T細胞は、細胞傷害性Tリンパ球(Cytotoxic T lymphocyte;CTL);腫瘍浸潤リンパ球(Tumor infiltrating lymphocyte;TIL)及び末梢血液単核細胞(Peripheral blood mononuclear cell;PBMC)から分離したT細胞からなる群から選ばれることを特徴とする、請求項17に記載の組換え細胞。
- 請求項16に記載の組換え細胞を含む、ANTXR(anthrax toxin receptor)を発現する固形癌予防又は治療用医薬組成物。
- 前記固形癌は、膵癌、胃癌、大腸癌、肺癌、乳癌、胚細胞癌、肝癌、皮膚癌、膀胱癌、前立腺癌、子宮癌、子宮頸癌及び卵巣癌からなる群から選ばれることを特徴とする、請求項19に記載の医薬組成物。
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