JPWO2006035681A1 - HLA−A11拘束性Tax抗腫瘍エピトープ - Google Patents
HLA−A11拘束性Tax抗腫瘍エピトープ Download PDFInfo
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Abstract
Description
(a)配列番号3又は4に示されるアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチド
(b)配列番号3又は4のいずれかに示されるアミノ酸配列において、1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチドや、(8)配列番号7又は8に示される塩基配列若しくはその相補的配列からなるDNAや、(9)上記8記載のDNAとストリンジェントな条件下でハイブリダイズし、かつHTLV−I特異的CTL誘導活性ペプチドをコードするDNAに関する。
A[方法と材料]
A−1(レシピエント/ドナー組み合わせ及び血液サンプル)
HLAが一致する同胞ドナーからHSCTを受けた急性型ATL患者並びにドナーから末梢血サンプルを得た。患者はHSCT後3ヶ月で完全寛解を得て、以後それを維持している。ヘパリン処置した血液を、移植147日後に採取し末梢血単核細胞(PBMC)をフィコール・ハイパックプラス勾配遠心法により単離し、使用するまで一部を液体窒素で保存した。
HSCT前の患者に由来するHTLV−I感染T細胞株であるILT−#156を、下記の手順で樹立した。PBMCからCD8+細胞を除去した後に1μg/mlのフィトヘマグルチニン(PHA)−Pで刺激し、次に10%熱不活性ウシ胎児血清(FCS)と、30U/mlの組換えヒトIL−2又は10ng/mlの組換えヒトIL−15を含むRPMI−1640培地で5%の二酸化炭素と共に37℃で2ヶ月以上維持した。また、エプスタイン・バールウイルス(EBV)形質転換B細胞株であるLCL−#156は、EBVを含むB95−8細胞の上清を用いて感染させたドナーのCD19+PBMCからインビトロで樹立した。
HSCT後の患者の全細胞又はCD8+細胞を豊富に含む260万個のPBMCを、1μg/mlのPHA−Pで刺激し、次に1%ホルムアルデヒド/PBSで前処理した同数のILT−#156細胞と混合した。これらのT細胞を10%FCS及び100U/mlの組換えヒトIL−2を添加したAIM−VTM培地(GIBCO-Invitrogen社製)で維持し、14日間隔にて定期的にILT−#156細胞で刺激をあたえた。
本発明者らはHTLV−IのTaxタンパク質の配列すべてを網羅するために15〜24塩基長のペプチドを用意した。これに加え、コンピュータ予測プログラムであるBIMAS(http://bimas.dcrt.nih.gov/molbil/hla#bind/)を文献(J. Immunol. 152, 163-175, 1994; J. Immunol. 152, 3913-3924, 1994)記載の方法に従い使用し、HLA-A11と結合する可能性のある9塩基長のHTLV−I Taxペプチドを用意した。
様々なエフェクター細胞対標的細胞(E/T)割合において51Cr放出分析を6時間行い、細胞傷害活性を測定した。特異的細胞傷害性を式([実験により得られた51Cr放出量−自発性の51Cr放出量]/[最大51Cr放出量−自発性の51Cr放出量]×100%)により算出した。エフェクター細胞が産生するIFN−γを測定するために、様々なE/T割合において標的細胞と18時間インキュベーションした後に、ELISA法(ヒトIFN−γELISAキット, Biosource社製、 Camarillo、California)を用いて二重測定した。
フィコエリトリン(PE)複合型HLA−A*1101/Tax88-96(KVLTPPITH;配列番号3)並びにHLA−A*1101/Tax272-280(QSSSFIFHK;配列番号4)4量体は、NIAID Tetramer Facility, Emory Univ. Vaccine Center at Yerks (Atlanta, Georgia)に合成を委託し提供を受けた。リンパ球を、PE-Cy5複合型抗CD8抗モノクロナール抗体(BD Pharmingen社製)を用いて30分間染色した後、4量体を用いてさらに60分間4℃で染色し、次にCellQuestソフトウェア(Beckton Dickinson社製)を用いてFACSCaliburで2色解析を行った。
B−1(HSCT前のHTLV−I感染細胞と反応するHSCT後のレシピエントからのCTL誘導)
HSCT前のレシピエント由来の造血細胞に対するHSCT後のレシピエントの免疫応答を調べるために、本発明者らはHSCT前の患者から、IL−2又はIL−15の存在下でPHAの刺激を受けたPBMCを2ヶ月以上維持することにより、T細胞株であるILT−#156を樹立した。この細胞株はCD4陽性で、HTLV−IのTax、p19等のHTLV−I抗原に陽性であった。
次に、HSCT後の患者PBMCからILT−#156に対して増殖したエフェクター細胞の細胞傷害特異性を51Cr放出分析により調べた。このエフェクター細胞はほとんどがCD8陽性であり、ILT−#156に対して顕著なレベルの細胞傷害性を示すとともに (図2)、HLA−A11を共有する同種HTLV−I感染TCL-Kan細胞を効果的に死滅させたが、HLA-A11を共有するLCL−Kan、HLA-A26を共有するHTLV-I感染ILT−Nkz-2やLCL−Nkzに対しては死滅させなかった。以上の結果は、ILT−#156に応答してHSCT後の患者PBMCから増殖した細胞株が、HLA-A11に拘束されるHTLV−I抗原特異的CD8+細胞傷害性Tリンパ球(CTL)を含むことを強く明示した。
本発明者らは以前、ATL患者において、HLAが一致する同胞からの骨髄非破壊性HSCT後に、限られた数のエピトープに対するHTLV−IのTax特異的CTL応答がおこることを見い出した(Cancer Res. 64, 391-399, 2004)。今回、新たなHSCT後のATL患者由来PBMCから、HLA−A11に拘束される2個のTaxエピトープに対するCTL応答を見い出した。これらのCTLは、HLA-A*1101/Tax88-96ならびにHLA-A*1101/Tax272-280の4量体で染色されるCTLを多数含有していた(図5)。
GVL効果の正確な標的抗原及びGVL効果に対するHTLV−IのTax特異的CTLの貢献度は充分には解明されていない。しかし、HAM/TSP患者において観察されたのと同様の、強力で選択的なHTLV−I特異的CTL応答が、HLA一致の同胞からの同種HSCT後にATL患者に樹立されたことは、患者体内でCTLエピトープが強く発現されていたことを意味し、本発明のCTLエピトープがワクチン抗原として有用であることを示す。このワクチン抗原を用いると、HTLV−I感染細胞の増殖をインビボで抑制するCTLを誘導できる可能性がある。
されるCTLの主要エピトープが見出された。HTLV−Iに対する免疫応答の検査に本エピトープ部位のペプチドを使用することによって、これまでに見出したHLA−A2, HLA−A24に拘束されるTaxエピトープと合わせ、日本人集団のかなりの部分をカバーできることになる。
(2)現在では、それぞれのHLAについて親和性のあるアミノ酸アンカーモチーフからエピトープの予測が可能である。しかしながら、生体内の病原体に対する宿主の免疫反応は必ずしもこの予測と一致しない。本発明により同定されたエピトープは感染個体から得られたものであり、しかも他のエピトープよりも非常に強い選択性を持って認識されている。
(3)ATL患者からHTLV−I特異的CTLが誘導されることは稀だが、幹細胞移植後に完全寛解に入ったATL症例から、本発明により同定されたエピトープに対するCTLが選択的に誘導された。これは、患者体内でこのエピトープが強く発現されていたことを意味し、本エピトープがワクチン抗原として有用であることを示している。
Claims (31)
- 配列番号3又は4に示されるアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチド。
- 配列番号3又は4に示されるアミノ酸配列において、1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチド。
- 請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドと、マーカータンパク質及び/又はペプチドタグとを結合させた融合ペプチド。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとが結合したタンパク−ペプチド結合体。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとが結合したタンパク−ペプチド結合体の4量体。
- 請求項4記載のタンパク−ペプチド結合体又は請求項5記載のタンパク−ペプチド結合体の4量体と、マーカータンパク質及び/又はペプチドタグとを結合させた融合タンパク質。
- 以下の(a)又は(b)のペプチドをコードするDNA。
(a)配列番号3又は4に示されるアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチド
(b)配列番号3又は4のいずれかに示されるアミノ酸配列において、1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチド - 配列番号7又は8に示される塩基配列若しくはその相補的配列からなるDNA。
- 請求項8記載のDNAとストリンジェントな条件下でハイブリダイズし、かつHTLV−I特異的CTL誘導活性ペプチドをコードするDNA。
- 配列番号3又は4に示されるアミノ酸配列を有するHTLV−I特異的CTL誘導活性ペプチドからなるHLA−A11拘束性Taxエピトープ。
- 配列番号3又は4に示されるアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチドを有効成分として含有する免疫応答誘導用ワクチン。
- 配列番号3又は4に示されるアミノ酸配列において、1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチドを有効成分として含有する免疫応答誘導用ワクチン。
- 請求項7〜9のいずれか記載のDNAを発現させることができるベクターを有効成分として含有する免疫応答誘導用ワクチン。
- さらに、HTLV−I特異的CTL誘導活性を増強するアジュバントが含まれている、請求項8〜10のいずれか記載の免疫応答誘導用ワクチン。
- 請求項11〜14のいずれか記載の免疫応答誘導用ワクチンを有効成分として含有する医薬組成物。
- 配列番号3又は4に示されるアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチドを有効成分として含有する免疫機能検査診断薬。
- 配列番号3又は4に示されるアミノ酸配列において、1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるHTLV−I特異的CTL誘導活性ペプチドを有効成分として含有する免疫機能検査診断薬。
- 請求項7〜9のいずれか記載のDNAを発現させることができるベクターを有効成分として含有する免疫機能検査診断薬。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとが結合したタンパク−ペプチド結合体を有効成分として含有する免疫機能検査診断薬。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとが結合したタンパク−ペプチド結合体の4量体を有効成分として含有する免疫機能検査診断薬。
- 請求項7〜9のいずれか記載のDNAを有効成分として含有するHTLV−I腫瘍の診断薬。
- 請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドに特異的に結合する抗体。
- 抗体がモノクローナル抗体である請求項22記載の抗体。
- 請求項22又は23記載のHTLV−I特異的CTL誘導活性ペプチドに特異的に結合する抗体を有効成分として含有するHTLV−I腫瘍の診断薬。
- 請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドを発現することができる発現ベクター。
- 請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドを発現することができる発現系を含んでなる宿主細胞。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとの結合体を発現することができる発現ベクター。
- HLA−A11と請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドとの結合体を発現することができる発現系を含んでなる宿主細胞。
- HSCT前のATL患者に由来するHTLV−I感染T細胞を用いて、同種のHLAタイプのドナー由来のHSCT後の同じ患者のPBMCを刺激することを特徴とするHTLV−I認識CTLの誘導方法。
- 請求項1又は2記載のHTLV−I特異的CTL誘導活性ペプチドを用いて、HLA−A11陽性のATL患者のPBMCを刺激することを特徴とするHTLV−I認識CTLの誘導方法。
- 請求項7〜9のいずれか記載のDNAを発現させることができるベクターを用いて、HLA−A11陽性のATL患者のPBMCを刺激することを特徴とするHTLV−I認識CTLの誘導方法。
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