JP2014176382A - 癌抗原特異的t細胞のレセプター遺伝子およびそれによりコードされるペプチドならびにそれらの使用 - Google Patents
癌抗原特異的t細胞のレセプター遺伝子およびそれによりコードされるペプチドならびにそれらの使用 Download PDFInfo
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Abstract
【解決手段】癌抗原特異的T細胞のレセプター遺伝子に含まれるポリヌクレオチドおよびそれによりコードされるペプチド、およびそれらを用いる癌の検査(診断、予後、治療モニタリング等)や癌の治療、ならびに上記ポリヌクレオチドを含むT細胞レセプター遺伝子を導入したリンパ球など。
【選択図】なし
Description
Valmori D. et al., J. Immunol. 168:4231-4240, 2002 Dietrich PY. et al., Cancer Res. 61:2047-2054, 2001 Coulie PG. et al., Proc. Natl. Acad. Sci. U.S.A. 98:10290-10295, 2001 Godelaine D. et al. J. Immunol. 171:4893-4897, 2003 Mandruzzato S. et al., J. Immunol. 169:4017-4024, 2002
すなわち、本発明は以下のものを提供する。
(1)WT1特異的細胞障害性T細胞(CTL)のT細胞レセプター(TCR)のVβ鎖のCDR3をコードするヌクレオチド配列を有するポリヌクレオチドであって、配列番号:1〜1695に示すいずれかのCDR3ヌクレオチド配列を有するDNA、またはその相補的RNA、またはそれらの相補配列を有するポリヌクレオチド;
(2)配列番号:1〜1695に示すいずれかのCDR3ヌクレオチド配列からなるDNA、またはその相補的RNA、またはそれらの相補配列からなる(1)記載のポリヌクレオチド;
(3)WT1特異的細胞障害性T細胞(CTL)のT細胞レセプター(TCR)のVβ鎖のCDR3のアミノ酸配列を有するペプチドであって、配列番号:1696〜3389に示すいずれかのCDR3アミノ酸配列を有するペプチド;
(4)配列番号:1696〜3389に示すいずれかのCDR3アミノ酸配列からなる(3)記載のペプチド;
(5)(1)または(2)記載のポリヌクレオチドあるいは(3)または(4)記載のペプチドの、癌マーカーとしての使用;
(6)治療前にHLA−A*2402陽性患者から得られた試料中の、(1)または(2)記載のいずれかのポリヌクレオチドあるいは(3)または(4)記載のいずれかのペプチドを有するWT1特異的CTLのクロナリティーを調べることを特徴とする、癌の診断方法であって、該クロナリティーが複数のWT1特異的CTLが存在する場合に、該患者が癌にかかっている可能性があると判定する方法;
(7)治療前の患者におけるいずれかのCDR3ポリヌクレオチドまたはいずれかのCDR3ペプチドを有する3以上のクロナリティーを有するWT1特異的CTLのクロナリティーが大きいほど、あるいは3以上のクロナリティーを有するWT1特異的CTLの種類が多いほど、該患者が癌にかかっている可能性が高いと判定する(6)記載の方法;
(8)治療前においてHLA−A*2402陽性患者から得られた試料中の、(1)または(2)記載のいずれかのポリヌクレオチドあるいは(3)または(4)記載のいずれかのペプチドを有するWT1特異的CTLの種類およびクロナリティーを調べることを特徴とする、WT1ペプチド免疫療法に対する患者の感受性を調べる方法であって、該患者におけるクロナリティーが複数であるWT1特異的CTLの種類が、WT1ペプチド免疫療法に対する無応答者のそれよりも多い場合に、WT1ペプチド免疫療法に対する該患者の感受性があると判定する方法;
(9)治療前の患者におけるクロナリティーが複数であるWT1特異的CTLクローンの種類が多いほど、あるいはクロナリティーが大きいほど、WT1ペプチド免疫療法に対する該患者の感受性が高いと判定する(8)記載の方法;
(10)WT1ペプチド免疫療法の前後において、HLA−A*2402陽性患者から得られた試料中の、(1)または(2)記載のいずれかのポリヌクレオチドあるいは(3)または(4)記載のいずれかのペプチドを有するWT1特異的CTLクローンのクロナリティーを調べることを特徴とする、該患者におけるWT1ペプチド免疫療法のモニタリング方法であって、いずれかのクローンに関してWT1ペプチド免疫療法前よりもWT1ペプチド免疫療法後において該WT1特異的CTLのクロナリティーが増加した場合に、該患者がWT1ペプチド免疫療法に応答したと判定する方法;
(11)WT1ペプチド免疫療法後において、クロナリティーの増加の割合が大きいほど、あるいはクロナリティーが増加したクローンの種類が多いほど、WT1ペプチド免疫療法に対する応答性が高いと判定する(10)記載の方法;
(12)(3)または(4)記載のペプチドに対する抗体;
(13)(1)または(2)記載のポリヌクレオチド、(3)または(4)記載のペプチド、あるいは(12)記載の抗体を含むチップ;
(14)配列番号:3391〜3418に示す配列から選択される配列を有するCDR3ポリペプチド増幅用プライマー;
(15)(1)または(2)記載のポリヌクレオチドあるいは(3)または(4)記載のペプチドを有するWT1特異的CTLを検出するための手段を含む、癌の診断キット、WT1ペプチド免疫療法に対する癌患者の感受性を調べるためのキット、またはWT1ペプチド免疫療法のモニタリング用キット;
(16)(1)または(2)記載のポリヌクレオチドあるいは(3)または(4)記載のペプチドを有するWT1特異的CTLを検出するための手段を含む、癌の診断装置、WT1ペプチド免疫療法に対する癌患者の感受性を調べるための装置、またはWT1ペプチド免疫療法のモニタリング用装置;
(17)(13)記載のチップまたは(14)記載のプライマーを含む(15)記載のキット;
(18)(13)記載のチップまたは(14)記載のプライマーが用いられる(16)記載の装置;
(19)(1)または(2)記載のポリヌクレオチド配列を含むT細胞レセプター遺伝子を導入したHLA−A*2402陽性癌患者のリンパ球。
(1)細胞
5人の健康ボランティア(HV1〜HV5)ならびに4人のHLA−A*2402陽性AML患者(AML1〜AML4)から末梢血試料を得た。5人のHLA−A*2402陽性MDS患者(MDS1〜MDS5)から骨髄試料または末梢血試料を得た。すなわち、AML1からは、治療前、治療開始から4、8、12、42週目に末梢血を得た。AML2からは、治療前、治療開始から4週目、8週目、12週目および42週目に末梢血を得た。AML3からは、治療前、治療開始から4週目、8週目に末梢血を得た。AML4からは、治療前、治療開始から4週目に末梢血を得た。MDS1からは、治療前の骨髄、治療前の末梢血、治療開始から4週目、8週目および12週目に末梢血を得た。MDS2〜5からは、治療前の末梢血および治療前の骨髄を得た。得られた末梢血試料をFicoll-Hypaque(Pharmacia, Uppsala, Sweden)を用いる密度勾配遠心分離に供して末梢血単核細胞(PBMCs)を分離し、使用するまで−170℃にて冷凍した。上記患者に対する治療は、WT1ペプチド免疫療法にて行った。治療に使用したWT1ペプチドのアミノ酸配列はCys−Tyr−Thr−Trp−Asn−Gln−Met−Asn−Leu(配列番号:3390)であり、2週間間隔で皮内注射により投与した。
先ず、1試料あたり2x106個のPBMCsを、FACSバッファー(2%ウシ胎児血清含有PBS)中にて37℃で30分、PE抱合HLA−A*2402−WT1 235−243テトラマー(MBL, Tokyo, Japan)にて染色した。次いで、下記の5色の蛍光標識モノクローナル抗体にて、暗所かつ氷上で25分染色した:FITC−標識抗−CD4、CD14、CD16、CD19およびCD56、抗−CD3−PerCP、抗−CD8−APC−Cy7(BD Bioscience, San Jose, CA)、抗−CD45RA−APCおよび抗−CCR7−PE−Cy7(BD Pharmingen, San Diego, CA)。染色された細胞をFACSバッファーにて2回洗浄した。FACSAria装置(BD Biosciences)を用いてソーティングを行い、FACSDivaソフトウェア(BD Biosciences)にてデータ解析を行って、CD4−CD14−CD16−CD19−CD56−細胞フラクション中の単一のHLA−A*2402−WT1 235−243テトラマー+CD3+CD8+細胞を得て、WT1−Tet+細胞と定義した。
DNAのコンタミネーションをなくし、十分な単一細胞のRT−PCRを行うために、cDNA合成を行い、すべてのPCR工程を別個のクリーンベンチ内で行った。単一WT1−Tet+細胞を、15μlのcDNA反応ミックスを入れたPCRチューブ中に直接ソーティングした。このcDNA反応ミックスは、下記のものを溶解バッファー(0.5% Triton X-100を含有する1XcDNAバッファー)中に含むものであった:逆転写酵素(SuperScript III, Invitrogen, Carlsbad, CA)、0.5mM dNTPs(Invitrogen)、20ユニット(U)のRnaseインヒビター(Invitrogen)、100μg/mlのゼラチン(Roche, Indianapolis, IN)、100μg/mlのtRNA(Roche)および200nMのTCR−β鎖不変領域特異的プライマー(5’-CACCAGTGTGGCCTTTTG-3’(配列番号:3391))。ソーティング後、cDNA合成のために試料を50℃で90分インキュベーションし、次いで、反応を停止させるために95℃で5分インキュベーションした。
上記手順により得た10μlの合成cDNA生成物を、40μlの反応ミックス中に添加した。この反応ミッックスは、1XPCRバッファー、2mM MgCl2、0.25mM dNTPs、1.25U DNAポリメラーゼ(Platinum Taq DNA Polymerase, Invitrogen)、5nMの24種のVβファミリー特異的フォワードプライマーの混合物(表1に示す)および5nMの3’Cβリバースプライマー(5’−GCTTCTGATGGCTCAAACACAGC−3’(配列番号:3392))を含んでいた。PCR手順は以下のとおりであった:プレ−PCR加熱工程を95℃で2分、次いで、95℃で45秒の変性工程、57℃で45秒のアニーリング工程および72℃で50秒の伸長工程からなるサイクルを40サイクル。
増幅されたTCR−β遺伝子フラグメントを、PCR Purification Kit(Qiagen, Valencia, CA)により精製した。対応するTCR Vβ特異的フォワードプライマーを用いて配列決定を行った。配列決定にはABI PRIAM BigDye Terminator v 3.1 Cycle Sequencing kit(Applied Biosystems, Foster City, CA, USA)を用い、ABI PRISM 3100 Genetic Analyzer(Applied Biosystems)にて分析を行った。IMGTヒトTCR遺伝子データベースのサイト(http://imgt.cines.fr)と比較することによりCDR3の配列データを分析した。
健常人および癌患者(AML1〜4、MDS1〜5)由来のWT1特異的CTLのVβ鎖遺伝子の配列、J領域の配列、D領域の配列、N領域の配列、CDR3ヌクレオチド配列およびCDR3アミノ酸配列を図1−1〜図1−36に示す。個々のWT1特異的CTLのクロナリティーを図2−1〜図2−36に示す。また、CDR3ヌクレオチド配列を配列番号:1〜1695に示し(クローン#24.29と#28.92のCDR3ヌクレオチド配列は同じものとなるのでクローン#24.29のほうを配列表に記載)、CDR3アミノ酸配列を配列番号:1696〜3389に示した(クローン#2.53と#28.58のCDR3アミノ酸配列は同じものであり、クローン#24.29と#28.92のCDR3アミノ酸配列も同じものであるので、クローン#2.53、クローン#24.19を配列表に記載)。なお、AML患者のうち、AML1およびAML2は治療に対して応答し、AML3およびAML4は応答しなかった。MDS患者については治療に対する応答を判定していない。
ティーが複数である細胞の種類の増加は、患者において癌細胞に対する防御・攻撃が既に開始されている可能性を示すものであり、既に癌細胞が患者に存在する可能性があると考えられる。
Claims (2)
- WT1特異的細胞障害性T細胞(CTL)のT細胞レセプター(TCR)のVβ鎖のCDR3をコードするヌクレオチド配列を有するポリヌクレオチド配列であって、配列番号:1〜1695に示すいずれかのCDR3ヌクレオチド配列を有するDNA、またはその相補的RNA、またはそれらの相補配列を有するポリヌクレオチド配列を含むT細胞レセプター遺伝子を導入したHLA−A*2402陽性癌患者のリンパ球。
- WT1特異的細胞障害性T細胞(CTL)のT細胞レセプター(TCR)のVβ鎖のCDR3をコードするヌクレオチド配列を有するポリヌクレオチド配列であって、配列番号:1〜1695に示すいずれかのCDR3ヌクレオチド配列からなるDNA、またはその相補的RNA、またはそれらの相補配列からなるポリヌクレオチド配列を含むT細胞レセプター遺伝子を導入したHLA−A*2402陽性癌患者のリンパ球。
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