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郑州大学一附院杨建军领衔《AM》|突破!精准递送STING激动剂,40倍减毒增效攻克“冷”肿瘤!

  • 2026-04-16 08:51:03
郑州大学一附院杨建军领衔《AM》|突破!精准递送STING激动剂,40倍减毒增效攻克“冷”肿瘤!

作者简介
WINTER IS COMING

本次分享一篇2026年 2月发表在 AM 上的文章,该文章的第一位通讯作者为郑州大学第一附属医院的杨建军教授。

1
 研究背景

STING(干扰素基因刺激蛋白)是固有免疫系统的核心枢纽。激活STING能够将免疫“冷”肿瘤转化为“热”肿瘤,近年来已成为肿瘤免疫治疗的前沿靶点。

然而,以ADU-S100为代表的环二核苷酸类STING激动剂面临三重屏障:

第一,细胞膜屏障。CDN带双负电荷,与带负电的细胞膜相互排斥,难以进入胞浆与STING受体结合。

第二,靶点泛化。STING蛋白广泛表达于各类细胞。非特异性激活会诱导CD8⁺ T细胞凋亡、调节性B细胞增殖、肿瘤细胞PD-L1上调。该研究证实:40 μg高剂量游离CDN虽能抑瘤,却导致T细胞浸润显著减少,中位生存期反低于20 μg剂量组。

第三,树突状细胞亚型精准度不足。I型传统树突状细胞是STING激动剂发挥抗肿瘤效应的关键节点。cDC1缺失小鼠中,STING激动剂完全失效。但现有纳米递送系统难以精准区分cDC1与其他DC亚型。

2
研究亮点

作者选择登革病毒2型为仿生模板。登革病毒的天然特性包括:

  • DC-SIGN受体靶向:病毒表面E蛋白特异性识别未成熟DC高表达的DC-SIGN

  • 内涵体逃逸:内涵体酸性环境触发E蛋白构象重排,暴露融合肽,介导膜融合与胞浆释放

  • 淋巴归巢:天然具备淋巴结归巢能力

通过慢病毒转导HEK293T细胞,构建稳定表达登革病毒prM/E蛋白的细胞系,经超速离心纯化获得直径约50 nm、无基因组、无衣壳蛋白C的病毒拟态囊泡。这一设计既保留登革病毒的靶向与入胞机制,又完全规避感染风险。

CDN通过电穿孔负载于VLP内部,包封率达75.72%。该制剂在生理条件下一周内粒径与表面电荷维持稳定。

设计策略

3
研究成果

在体外,VLP2通过DC-SIGN受体介导内吞,DC摄取较脂质体提高4.8倍,T细胞几乎无摄取。共定位分析显示:CDN@VLP2处理6 h后,CDN完全脱离内涵体,分布于胞浆。这一过程依赖E蛋白与内涵体酸化——E蛋白封闭或巴弗洛霉素A1处理均使逃逸能力丧失。

在体内,瘤内注射CDN@VLP2后,肿瘤局部CDN滞留量较游离组提高19.3倍,DC摄取显著增加,T细胞摄取减少14.8倍。

疗效层面:5 μg CDN@VLP2的肿瘤抑制效果与20 μg游离CDN相当,40倍增效;40 μg剂量下,游离CDN已出现体重下降与生存期缩短,而CDN@VLP2组小鼠体重稳定,CD8⁺ T细胞浸润仍维持高水平。

4
关键数据

首先,作者证明高剂量(40 μg)游离CDN虽可抑瘤,但导致CD8⁺ T细胞摄取CDN增加、肿瘤浸润反而减少,生存期短于20 μg剂量组,证实非特异性STING激活诱导T细胞凋亡。

图1 

其次,VLP2将CDN瘤内滞留提高19.3倍,DC摄取增加4.8倍、T细胞摄取减少14.8倍,5 μg即达到游离CDN 20 μg的抑瘤效果,且40 μg仍无T细胞耗竭。

图2

接下来,封闭DC-SIGN或E蛋白均使DC摄取下降;共定位显示6 h内CDN完全脱离内涵体;E蛋白封闭或巴弗洛霉素抑制内涵体酸化后逃逸能力丧失。

图3

随后,VLP3介导DC及cDC1摄取效率最高、IFN-β诱导最强;分子动力学模拟证实VLP3的prM-E蛋白与DC-SIGN结合自由能最低(–156.09 kcal/mol),界面相互作用最稳定。

图4

接着,CDN@VLP3使瘤内IFN-β、CXCL9/10、TNF-α、IFN-γ显著升高,DC活化提高4.1倍,CD8⁺ T细胞浸润增加2.4倍,M2巨噬细胞与MDSCs减少,NK细胞活化增强。

图5

随之,转录组显示XCL1、CCL4、CCL5显著上调;ELISA证实XCL1蛋白水平仅CDN@VLP3组显著升高;瘤内cDC1丰度提高2.0倍、成熟cDC1比例提高1.9倍。

图6

最后,双侧瘤模型中,瘤内注射CDN@VLP3显著抑制对侧肿瘤生长,联合抗PD-1后效果更佳;静脉注射CDN@VLP3肿瘤蓄积提高1.9倍,20 μg组完全缓解率16.7%,且无游离CDN所致肝损伤。

图7

5
总结与展望

总之,作者建立了一个高保真登革病毒拟态囊泡的工程化平台,系统完成了从机制解析、亚型筛选、结构模拟、疗效验证到联合治疗的完整证据链。这一策略不仅解决了STING激动剂效力与安全性难以兼得的矛盾,更重要的是,DC-SIGN受体在多个DC亚群及多种抗原提呈细胞均有表达,基于登革病毒E蛋白的靶向模块有望拓展至肿瘤疫苗、自身免疫病、感染性疾病等多个领域。

📣纳米智研

纳智见,研未来!专注纳米技术与智能医疗前沿!欢迎投稿与商务合作,敬请添加纳米智研主编微信!

论文链接DOI: 10.1002/adma.202520019External Link

期刊影响因子: 26.8

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原文链接点击阅读原文

声明:本文对研究论文的解读仅出于传播和交流肿瘤治疗领域学术进展的目的,旨在为读者提供前沿科研动态参考。文章内容不代表对原始文献数据真实性、科学性及临床适用性的判断或背书。读者如需引用或进一步验证,请务必查阅论文原文以获取完整信息。研究的具体临床应用需以后续权威机构评估结果为准。

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  1. CONNECT:[ UseTime:0.000462s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000602s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.000235s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000534s ]
  8. SELECT * FROM `article` WHERE `id` = 479099 LIMIT 1 [ RunTime:0.002152s ]
  9. UPDATE `article` SET `lasttime` = 1777619457 WHERE `id` = 479099 [ RunTime:0.000733s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 479099 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006960s ]
  12. SELECT * FROM `article` WHERE `id` > 479099 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005564s ]
  13. SELECT * FROM `article` WHERE `id` < 479099 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011181s ]
  14. SELECT * FROM `article` WHERE `id` < 479099 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007322s ]
  15. SELECT * FROM `article` WHERE `id` < 479099 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004005s ]
0.121853s