JPWO2008081701A1 - Hla−a*1101拘束性wt1ペプチド、およびそれを含む医薬組成物 - Google Patents
Hla−a*1101拘束性wt1ペプチド、およびそれを含む医薬組成物 Download PDFInfo
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- JPWO2008081701A1 JPWO2008081701A1 JP2008552080A JP2008552080A JPWO2008081701A1 JP WO2008081701 A1 JPWO2008081701 A1 JP WO2008081701A1 JP 2008552080 A JP2008552080 A JP 2008552080A JP 2008552080 A JP2008552080 A JP 2008552080A JP WO2008081701 A1 JPWO2008081701 A1 JP WO2008081701A1
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Abstract
Description
(1)WT1タンパク質由来の9個の連続するアミノ酸からなるアミノ酸配列を含むペプチドであって、HLA−A*1101分子と結合能を有し、かつCTL誘導能を有する、ペプチド、
(2)アミノ酸配列の第9位のアミノ酸がLysまたはArgである、(1)記載のペプチド、
(3)アミノ酸配列が以下の群:
Ala Ala Gly Ser Ser Ser Ser Val Lys(配列番号:2)、
Pro Ile Leu Cys Gly Ala Gln Tyr Arg(配列番号:3)、
Arg Ser Ala Ser Glu Thr Ser Glu Lys(配列番号:4)、
Ser Ala Ser Glu Thr Ser Glu Lys Arg(配列番号:5)、
Ser His Leu Gln Met His Ser Arg Lys(配列番号:6)、
Thr Gly Val Lys Pro Phe Gln Cys Lys(配列番号:7)、
Lys Thr Cys Gln Arg Lys Phe Ser Arg(配列番号:8)、
Ser Cys Arg Trp Pro Ser Cys Gln Lys(配列番号:9)、
Asn Met His Gln Arg Asn Met Thr Lys(配列番号:10)、
からなる群より選択される、(1)記載のペプチド、
(4)アミノ酸配列がAla Ala Gly Ser Ser Ser Ser Val Lys(配列番号:2)である、(3)記載のペプチド、
(5)少なくとも1個のシステイン残基を含むWT1タンパク質由来の9個の連続するアミノ酸からなるアミノ酸配列を含む2個のペプチド単量体が、ジスルフィド結合により互いに結合しているペプチド二量体であって、HLA−A*1101分子と結合能を有し、かつCTL誘導能を有する、ペプチド二量体、
(6)ペプチド単量体のアミノ酸配列が、以下の群:
Pro Ile Leu Cys Gly Ala Gln Tyr Arg(配列番号:3)、
Thr Gly Val Lys Pro Phe Gln Cys Lys(配列番号:7)、
Lys Thr Cys Gln Arg Lys Phe Ser Arg(配列番号:8)、
Ser Cys Arg Trp Pro Ser Cys Gln Lys(配列番号:9)、
からなる群より選択される、(5)記載のペプチド二量体、
(7)(1)記載のペプチドおよび/または(5)記載のペプチド二量体を含む、癌を治療または予防するための医薬組成物、
(8)有効量の(1)記載のペプチドおよび/または(5)記載のペプチド二量体をHLA−A*1101陽性対象に投与することを特徴とする、癌を治療または予防するための方法、
(9)(1)記載のペプチドをコードするポリヌクレオチド、
(10)(9)記載のポリヌクレオチドを含む発現ベクター、
(11)(9)記載のポリヌクレオチドまたは(10)記載のベクターを含む、癌を治療または予防するための医薬組成物、
(12)有効量の(9)記載のポリヌクレオチドまたは(10)記載のベクターをHLA−A*1101陽性対象に投与することを特徴とする、癌を治療または予防するための方法、
(13)(1)記載のペプチドおよび/または(5)記載のペプチド二量体により誘導される、WT1特異的CTL、
(14)末梢血単核球を(1)記載のペプチドおよび/または(5)記載のペプチド二量体の存在下で培養し、該末梢血単核球からWT1特異的CTLを誘導することを特徴とする、WT1特異的CTLの誘導方法、
(15)(1)記載のペプチドおよび/または(5)記載のペプチド二量体を必須構成成分として含む、WT1特異的CTLを誘導するためのキット、
(16)(1)記載のペプチドおよび/または(5)記載のペプチド二量体により誘導される、WT1ペプチドを提示する抗原提示細胞、
(17)未熟抗原提示細胞を(1)記載のペプチドおよび/または(5)記載のペプチド二量体の存在下で培養し、該未熟抗原提示細胞からWT1ペプチドを提示する抗原提示細胞を誘導することを特徴とする、WT1ペプチドを提示する抗原提示細胞の誘導方法、
(18)(1)記載のペプチドおよび/または(5)記載のペプチド二量体を必須構成成分として含む、WT1ペプチドを提示する抗原提示細胞を誘導するためのキット、
(19)(13)記載のCTLまたは(16)記載の抗原提示細胞を用いることを特徴とする、癌の診断方法、
を提供するものである。
(a)WT1ペプチドとHLA−A*1101分子との複合体を該対象由来試料と反応させ;次に、
(b)該試料に含まれる該複合体を認識するCTLの存在または量を調べる、
工程を含む方法に関するものである。対象由来試料は、リンパ球が含まれている可能性があればいずれのものであってもよく、例えば、血液、リンパ液などの体液、組織などが挙げられる。WT1ペプチドとHLA−A*1101分子との複合体は、例えば、ビオチンストレプトアビジン法などの当業者に既知の方法を用いて、例えば、テトラマー、ペンタマーなどの形態にされていてもよい。かかる複合体を認識するCTLの存在または量は、当業者に既知の方法により測定することができる。本発明のこの態様において、上記複合体は標識されたものであってもよい。標識としては、蛍光標識、放射性標識などの公知のものを使用することができる。標識することで、CTLの存在または量の決定が容易かつ迅速になる。
(a)試料と該複合体を反応させ、
(b)該試料中に含まれる該複合体を認識するCTLを得る、
工程を含む方法に関するものである。WT1ペプチドとHLA−A*1101分子との複合体については上述の通りである。試料は、リンパ球が含まれている可能性があればいずれのものであってもよく、例えば、血液などの対象由来試料、細胞培養液などが挙げられる。複合体を認識するCTLの取得は、例えば、FACS、MACSなど当業者に既知の方法を用いて行うことができる。得られたWT1特異的CTLを培養し、種々の癌の治療または予防に用いることも可能になる。
RANKPEP(http://bio.dfci.harvard.edu/Tools/rankpep.html)を用いて、WT1タンパク質(配列番号:1)由来のペプチドから、HLA−A*1101分子との結合能の高いWT1251、WT1279、WT1312、WT1313、WT1338、WT1378、WT1386、WT1415、およびWT1436を選択した。これらのペプチドのアミノ酸配列、配列番号:1におけるアミノ酸番号、HLA−A*1101分子に対する親和性スコアを表1に示す。
HLA−A*1101陽性健常人ドナーより採取した末梢血からFicoll-Hypaque gradient density centrifugation法により末梢血単核球(PBMC)を分離した。次に、PBMCを24ウェル細胞培養用プレートに10% FCS含有RPMI 1640培地中約1×107個の密度で播種し、B95−8細胞(EBウイルス産生細胞)の培養上清を添加して、37℃、5% CO2で約1ヶ月間培養した。EBウイルスにより形質転換された、B細胞系腫瘍細胞であるB−LCL細胞を得た。得られたB−LCL細胞がWT1遺伝子を発現していないことを確認した。B−LCL細胞を20μg/ml WT1251、WT1279、WT1312、WT1313、WT1338、WT1378、WT1386、WT1415、またはWT1436と共に2時間インキュベーションすることでパルスし、次に、放射線80Gyを照射させた。得られたB−LCL細胞(以下、WT1ペプチドでパルスしたB−LCL細胞という)を抗原提示細胞として以下の実験に用いた。
自己のPBMC3×106個を、24ウェル細胞培養用プレートにて20μg/ml WT1251、WT1279、WT1312、WT1313、WT1338、WT1378、WT1386、WT1415、またはWT1436を含む完全培地(45% RPMI、45% AMI−V培地、および10% ヒトAB血清)中、37℃、5% CO2で1週間培養し、応答細胞を得た。得られた応答細胞 2×106個を、同じWT1ペプチドでパルスしたB−LCL細胞 1×106個と完全培地中で1週間共培養した(1回目刺激)。PBMCをWT1ペプチドでパルスしたB−LCL細胞とさらに3回共培養し(2〜4回目刺激)、その際20IU/ml(最終濃度)IL2を、次の条件;2回目刺激:刺激開始の3日後から1日置き計2回;3回目および4回目刺激:刺激開始の翌日から1日置き計3回添加した。得られた細胞を、Negative Selection Columns Gravity Feed Kit(StemSp)を用いてCD8陽性T細胞が約80%となるよう濃縮し、次に、WT1ペプチドでパルスしたB−LCL細胞と共培養した(5回目刺激)。最終刺激の5日後のCD8陽性T細胞(CTL)を細胞傷害活性の測定のために用いた。
CTLの細胞傷害活性を51Cr遊離試験を用いて測定した。CTL細胞(以下、エフェクター細胞ともいう)を、あらかじめ51Crを取り込ませた標的細胞と1:1ないし30:1の比率(E/T比)となるよう培地 200μlに調製し、96ウェル細胞培養用プレート中、37℃、5% CO2で4時間培養した。標的細胞として、CTL誘導に用いたWT1ペプチドと同じペプチドでパルスしたB−LCL細胞(BLCL−P)、およびWT1ペプチドをパルスしていないB−LCL細胞(BLCL−NP)を用いた。培養後、遠心して上清を回収し、液体シンチレーションカウンターを用いて、上清中に遊離した51Cr量を測定した。細胞傷害活性(%)を次の式:
(試料上清中の51Cr遊離量−自然発生51Cr遊離量)/(最大51Cr遊離量−自然発生51Cr遊離量)×100
(自然発生51Cr遊離量は、51Crを取り込ませた標的細胞のみを同様の条件で培養したときの51Cr遊離量であり、最大51Cr遊離量は、51Crを取り込ませた標的細胞を1% トリトンX−100を用いて全細胞を溶解させたときの51Cr遊離量である)
を用いて決定した。結果を図1〜9に示す。図中、縦軸は特異的溶解(%)を示し、横軸はE/T比を示す。また、BLCL−Pを実線、BLCL−NPを点線で示す。WT1251、WT1279、WT1312、WT1313、WT1338、WT1378、WT1386、WT1415、およびWT1436を用いて誘導されたCTLは、BLCL−NP細胞と比較して、WT1ペプチドをHLA−A*1101分子との複合体として提示しているBLCL−P細胞を特異的に傷害することが確認できた。以下で、WT1251、WT1279、WT1313、WT1338、およびWT1386を用いて誘導されたCTLについてさらなる実験を行った。
WT1251、WT1279、WT1313、WT1338、およびWT1386を用いて誘導されたCTLのWT1発現B−LCLに対する細胞傷害活性を上述の方法を用いて決定した。WT1発現細胞は、ヒトWT1遺伝子を導入したB−LCL細胞であって、細胞内でWT1タンパク質を発現し、プロセスされて約9個のアミノ酸からなるペプチドをHLA−A*1101分子上に発現する細胞をいう。結果を図1、2、4、5、および7に示す。図中、WT1発現B−LCLを破線で示す。WT1251、WT1279、WT1313、WT1338、およびWT1386を用いて誘導されたCTLが、WT1遺伝子を内因性に発現している細胞に対しても傷害活性を有することが確認できた。
WT1378ペプチド単量体227.5mg、N−メチルグルカミン(NMG)227.5mgおよび水23mlの混合物を室温で約2日間攪拌することにより、空気酸化した。得られた混合液に酢酸ナトリウム2gを水5mlに溶解した水溶液を加え約20分間、室温にて攪拌した。水200mlとアセトニトリル約200mlを添加し、桐山ロート(ろ紙 No.5C)でろ過し、水(約50ml×3回)で洗浄した。残渣に水約200mlを添加し、凍結乾燥を行い、粗ペプチドWT1378二量体158mgを得た。
粗WT1ペプチド378二量体158mgをDMSO 9mlに溶解し、HPLC(島津製作所製 LC8AD型)にセットした、1液(H2O/1% AcOH)で平衡化したODS C18カラム(5cm Φ×50cm L,YMC社製)にHPLCポンプを用いて注入した。カラムを約30分間そのままにし、0%〜40%の濃度勾配の2液(CH3CN/1% AcOH)で360分間かけて溶出した。220nmでのUV吸収をモニターしながら、自動分画装置を用いて、WT1ペプチド二量体を含む分画を回収した。回収した分画を合わせ、HPLC(日立製 L−4000型)にセットした、17%の2液で平衡化したODS C18カラム(4.6mm Φ×25cm L,YMC社製)に注入し、0%〜47%の濃度勾配の2液で30分かけて溶出し、保持時間20.51分の精製WT1378ペプチド二量体46.6mgを得た。
FAB.MS 2365.0(理論値 2342.70)Na+ F=0.25%
得られたWT1378ペプチド二量体、WT1378ペプチド、改変WT1378ペプチド(G→I)(配列番号:11)および改変WT1378ペプチド(G→V)(配列番号:12)、WT1379ペプチド(配列番号:13,国際公開第2002/28414号において開示)のCTL誘導能を、上述の方法により、HLA−A*1101陽性健常人ドナー1〜3由来のPBMCを用いて調べた。結果を図10〜14に示す。図中、縦軸は特異的溶解(%)を示し、横軸はE/T比を示す。また、BLCL−Pを実線、BLCL−NPを点線で示す。WT1378ペプチド二量体がCTL誘導能を有することが確認できた。また、WT1タンパク質のアミノ酸配列において、WT1378ペプチドと1アミノ酸ずつ異なるWT1379ペプチドのCTL誘導能は、WT1378ペプチドと比較して極めて低く、本発明のWT1ペプチドが既知のWT1ペプチドと比較して格別顕著なCTL誘導能を有することがわかった。
SEQ ID NO: 12: Modified WT1 peptide
Claims (19)
- WT1タンパク質由来の9個の連続するアミノ酸からなるアミノ酸配列を含むペプチドであって、HLA−A*1101分子との結合能を有し、かつCTL誘導能を有する、ペプチド。
- アミノ酸配列の第9位のアミノ酸がLysまたはArgである、請求項1記載のペプチド。
- アミノ酸配列が以下の群:
Ala Ala Gly Ser Ser Ser Ser Val Lys(配列番号:2)、
Pro Ile Leu Cys Gly Ala Gln Tyr Arg(配列番号:3)、
Arg Ser Ala Ser Glu Thr Ser Glu Lys(配列番号:4)、
Ser Ala Ser Glu Thr Ser Glu Lys Arg(配列番号:5)、
Ser His Leu Gln Met His Ser Arg Lys(配列番号:6)、
Thr Gly Val Lys Pro Phe Gln Cys Lys(配列番号:7)、
Lys Thr Cys Gln Arg Lys Phe Ser Arg(配列番号:8)、
Ser Cys Arg Trp Pro Ser Cys Gln Lys(配列番号:9)、
Asn Met His Gln Arg Asn Met Thr Lys(配列番号:10)、からなる群より選択される、請求項1記載のペプチド。 - アミノ酸配列がAla Ala Gly Ser Ser Ser Ser Val Lys(配列番号:2)である、請求項3記載のペプチド。
- 少なくとも1個のシステイン残基を含むWT1タンパク質由来の9個の連続するアミノ酸からなるアミノ酸配列を含む2個のペプチド単量体が、ジスルフィド結合により互いに結合しているペプチド二量体であって、HLA−A*1101分子との結合能を有し、かつCTL誘導能を有する、ペプチド二量体。
- ペプチド単量体のアミノ酸配列が、以下の群:
Pro Ile Leu Cys Gly Ala Gln Tyr Arg(配列番号:3)、
Thr Gly Val Lys Pro Phe Gln Cys Lys(配列番号:7)、
Lys Thr Cys Gln Arg Lys Phe Ser Arg(配列番号:8)、
Ser Cys Arg Trp Pro Ser Cys Gln Lys(配列番号:9)、
からなる群より選択される、請求項5記載のペプチド二量体。 - 請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体を含む、癌を治療または予防するための医薬組成物。
- 有効量の請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体をHLA−A*1101陽性対象に投与することを特徴とする、癌を治療または予防するための方法。
- 請求項1記載のペプチドをコードするポリヌクレオチド。
- 請求項9記載のポリヌクレオチドを含む発現ベクター。
- 請求項9記載のポリヌクレオチドまたは請求項10記載のベクターを含む、癌を治療または予防するための医薬組成物。
- 有効量の請求項9記載のポリヌクレオチドまたは請求項10記載のベクターをHLA−A*1101陽性対象に投与することを特徴とする、癌を治療または予防するための方法。
- 請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体により誘導される、WT1特異的CTL。
- 末梢血単核球を請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体の存在下で培養し、該末梢血単核球からWT1特異的CTLを誘導することを特徴とする、WT1特異的CTLの誘導方法。
- 請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体を必須構成成分として含む、WT1特異的CTLを誘導するためのキット。
- 請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体により誘導される、WT1ペプチドを提示する抗原提示細胞。
- 未熟抗原提示細胞を請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体の存在下で培養し、該未熟抗原提示細胞からWT1ペプチドを提示する抗原提示細胞を誘導することを特徴とする、WT1ペプチドを提示する抗原提示細胞の誘導方法。
- 請求項1記載のペプチドおよび/または請求項5記載のペプチド二量体を必須構成成分として含む、WT1ペプチドを提示する抗原提示細胞を誘導するためのキット。
- 請求項13記載のCTLまたは請求項16記載の抗原提示細胞を用いることを特徴とする、癌の診断方法。
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