悪性出血および免疫原性腫瘍由来エクソソーム
Fabrice Andre1, Noel E C Schartz, Mojgan Movassagh
1Departments of Clinical Biology, Immunology Unit, Institut Gustave Roussy, Villejuif, France.
Lancet (London, England)
|July 31, 2002
まとめ
悪性出血で発見された腫瘍由来エクソソームは,腫瘍特異のT細胞を生成するために使用することができます. これらのアシテスエクソソームは,がんの免疫療法開発のための腫瘍抗原の新しい源として機能します.
科学分野:
- 免疫学 免疫学とは
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
背景:
- 腫瘍由来エクソソームは,がん細胞によって放出される膀である.
- エクソソームのインビヴォの役割と,がんの免疫療法におけるその可能性が調査されました.
- 悪性出血は,腫瘍エクソソームの存在を検査した.
研究 の 目的:
- 悪性出血中の腫瘍エクソソームが,腫瘍特異のT細胞を誘発できるかどうかを判断する.
- 癌ワクチンの腫瘍抗原の源としてアシテスエクソソムの可能性を調査する.
主な方法:
- エクソソームは,超遠心分離を用いて11の悪性出血から分離した.
- エクソソームの特徴付けには,ウエスタン・ブロット,免疫電子顕微鏡,およびT細胞のインビトロ刺激が含まれていました.
- 腫瘍特異のT細胞を拡張するために,自体の樹状細胞をアシテスエクソソームでパルスさせました.
主要な成果:
- 悪性出血には,MHCクラスI,CD81,腫瘍抗原 (Her2/Neu,Mart1,TRP,gp100) を発現する多数のエクソソーム (平均直径80nm) が含まれています.
- メラノーマエクソソームは,T細胞のクロスプレゼンテーションのために,Mart1腫瘍抗原をデンドリット細胞に伝達した.
- 腫瘍特異のT細胞は,アシテスエクソソームを持つ自同 dendritic 細胞をパルスさせることで,がん患者の7/9で拡張されました.
結論:
- 腫瘍エクソソームは,がん患者のアシテスに蓄積される.
- アシテスエクソソームは,腫瘍拒絶抗原の新たな源である.
- これらの発見は,がんの免疫療法を開発するための新しい戦略を示唆しています.
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