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AIVEV文献分享丨Cancer cell活化T细胞外囊泡DNA传递增强抗原呈递与抗肿瘤免疫

AIVEV文献分享丨Cancer cell活化T细胞外囊泡DNA传递增强抗原呈递与抗肿瘤免疫

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    近期由康奈尔大学 Weill Cornell 医学院Haiying Zhang、Irina R. Matei、David Lyden三位教授共同通讯,Mengying Hu、Di-Ao Liu 为共同一作,团队在《Cancer Cell》首次揭示活化 T 细胞胞外囊泡(AT-EVs)通过携带功能性 DNA,直接增强抗原呈递、唤醒肿瘤免疫,为免疫耐药肿瘤提供全新无细胞治疗策略。

研究背景:

    免疫治疗已成为癌症克星,但胰腺癌、胶质母细胞瘤等 “冷肿瘤” 常因抗原呈递缺陷,躲避免疫监视,导致 PD-1 等药物失效。目前仅 IFN-γ 能上调抗原呈递,却效果有限、副作用复杂。胞外囊泡(EVs)是细胞间天然信使,但活化 T 细胞的 EVs 如何调控免疫、其携带 DNA 有何功能,仍是未解之谜。本研究直击临床痛点,找到一条不依赖 IFN-γ、安全高效的抗癌新通路。

本文亮点:

1. 全新机制:首次发现活化 T 细胞通过 EV-DNA 实现非病毒、瞬时核基因转移,直接激活抗原呈递通路,颠覆传统免疫认知。

2. 双重激活:同时增强树突状细胞与肿瘤细胞的抗原呈递,把 “冷肿瘤” 变成 “热肿瘤”。

3. 临床价值:AT-EVs 可单独或联合 PD-1 抑制剂,高效抑制胰腺癌、脑瘤等难治肿瘤,安全性远超细胞治疗。

图文导读:

01

图1 :T 细胞源性 EV 在生理状态下的分布与功能。活化 T 细胞来源的胞外囊泡(AT-EVs)可特异性靶向富集于淋巴结、脾脏等免疫器官,且优先被树突状细胞(DC)摄取,进而显著上调 DC 中抗原呈递通路相关基因的表达,提升 MHC-I 分子水平并强力驱动 CD4+、CD8+ T 细胞增殖活化,而经 DNA 酶处理去除 EV-DNA 后,AT-EVs 的上述免疫激活效应会完全消失,证实其功能核心为 EV-DNA。

02

图2:T 细胞源性 EV-DNA 的系统表征。活化 T 细胞分泌的 AT-EVs 携带远高于其他细胞的双链胞外囊泡 DNA(EV-DNA),该 DNA 主要为 T 细胞活化后新合成的核基因组 DNA,片段大小分布在 150bp-20kb 之间,且高度富集抗原呈递相关基因,同时只有活化 T 细胞能将新合成 DNA 打包进 EV,明确了 EV-DNA 是 AT-EVs 发挥免疫调控功能的核心物质。

03

图3:AT-EVs 直接增强肿瘤细胞免疫原性。AT-EVs 可通过 ICAM1-LFA-1 通路特异性靶向肿瘤组织,其肿瘤靶向性优于非活化 T 细胞 EV 与肿瘤细胞 EV,进入肿瘤后能直接上调肿瘤细胞的 MHC-I 及全套抗原呈递相关基因表达,不仅能减缓肿瘤生长,还可显著增加瘤内 CD8+ T、NK 细胞浸润,减少免疫抑制细胞,同时促进引流淋巴结中 T 细胞活化,形成抗肿瘤免疫正向循环。

04

4:AT-EVs 在免疫 “冷肿瘤” 中诱导抗肿瘤免疫。AT-EVs 单药即可有效抑制胶质母细胞瘤、胰腺癌、乳腺癌等免疫 “冷肿瘤” 的生长,与抗 PD-1 抑制剂联合使用时能产生极强的协同抗肿瘤效应,显著延长荷瘤小鼠生存期,同时可大幅上调肿瘤细胞 MHC-I/II 表达,诱导肿瘤内三级淋巴结构(TLS)形成,重塑肿瘤免疫微环境,成功逆转免疫检查点抑制剂耐药。

05

图5:AT-EVs 不依赖 IFN-γ 与经典 DNA 感知通路。AT-EVs 增强抗原呈递的作用机制独立于经典免疫调控通路,既不依赖 IFN-γ/JAK-STAT 信号通路,也不依赖 cGAS-STING、TLR9、AIM2 等胞质 DNA 感知通路,抑制上述通路均无法阻断其免疫激活效应,仅 DNA 酶处理可完全消除该作用,证实其存在全新的免疫激活机制。

06

图6:AT-EVs 通过瞬时水平 DNA 转移增强免疫原性。AT-EVs 可通过瞬时水平 DNA 转移的方式,将功能性抗原呈递相关基因传递至受体细胞,能恢复 MHC 缺陷型细胞的抗原呈递功能并重新激活抗原特异性 T 细胞,跨品系实验也验证了该直接基因转移效应,且基因表达为瞬时性、不整合至宿主基因组,具备良好的生物安全性。

07

图6:颗粒酶 B 介导 EV-DNA 进入细胞核。颗粒酶 B(Gzmb)是 AT-EVs 特异性高表达的核心功能蛋白,其可通过破坏受体细胞核膜结构,介导 EV-DNA 进入细胞核的常染色质区域,进而启动抗原呈递基因的表达,使用 Gzmb 抑制剂后,EV-DNA 无法入核,AT-EVs 上调 MHC 分子的效应会丧失 85% 以上,明确 Gzmb 介导的 EV-DNA 核转运是其增强抗原呈递的核心机制。

总结与展望

    本研究系统揭示了活化 T 细胞来源胞外囊泡(AT-EVs)调控抗肿瘤免疫的全新机制,证明 AT-EVs 可通过携带富含抗原呈递(APP)通路基因的双链 DNA,在颗粒酶 B(Gzmb)介导下进入受体细胞核内,实现非病毒、瞬时、非整合的水平基因转移,从而同时增强树突状细胞与肿瘤细胞的抗原呈递能力,将 “免疫冷肿瘤” 转化为 “免疫热肿瘤”。研究证实,AT-EVs 可特异性靶向淋巴结与肿瘤组织,重塑肿瘤免疫微环境,显著提升 CD8⁺T 细胞、NK 细胞与成熟树突状细胞浸润,并诱导三级淋巴结构(TLS)形成。更重要的是,AT-EVs 单独使用即可抑制肿瘤进展,与 PD-1 抑制剂联用产生强效协同效应,能够逆转免疫检查点抑制剂耐药。机制上,该免疫激活作用不依赖 IFN-γ 与经典 DNA 感知通路,完全由 EV-DNA 与颗粒酶 B 共同驱动,为肿瘤免疫逃逸机制与免疫治疗提供了全新理论框架与转化方向

doi:

10.1016/j.ccell.2026.03.023

原文链接:

https://www.cell.com/cancer-cell/fulltext/S1535-6108(26)00177-7?rss=yes

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000752s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000560s ]
  8. SELECT * FROM `article` WHERE `id` = 690473 LIMIT 1 [ RunTime:0.000560s ]
  9. UPDATE `article` SET `lasttime` = 1780216316 WHERE `id` = 690473 [ RunTime:0.000791s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000264s ]
  11. SELECT * FROM `article` WHERE `id` < 690473 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000442s ]
  12. SELECT * FROM `article` WHERE `id` > 690473 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000384s ]
  13. SELECT * FROM `article` WHERE `id` < 690473 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001835s ]
  14. SELECT * FROM `article` WHERE `id` < 690473 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002175s ]
  15. SELECT * FROM `article` WHERE `id` < 690473 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001478s ]
0.085681s