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资讯:Sci Adv | 南京大学胡勇等合作开发新的水凝胶,用于增强抗肿瘤免疫治疗

  • 2026-02-11 16:06:02
资讯:Sci Adv | 南京大学胡勇等合作开发新的水凝胶,用于增强抗肿瘤免疫治疗

iNature

三级淋巴结构(TLS)诱导药物的非特异性分布可能引发自身免疫性疾病。2026年1月9日,南京大学胡勇,南京医科大学赵薇和徐州医科大学杨霏共同通讯在Science Advances 在线发表题为“Self-transforming hydrogel mimicking tertiary lymph nodes to activate cGAS-STING pathway for enhanced antitumor immunotherapy”的研究论文。该研究开发了一种可原位自转化的壳聚糖水凝胶,以充当一种仿生TLS。将壳聚糖水凝胶溶液注射至荷瘤小鼠的瘤周区域,随后其迅速发生原位凝胶化。在利用多柔比星和头孢噻肟杀灭肿瘤细胞及瘤内细菌后,该水凝胶高效吸附了细菌来源的病原相关分子模式、肿瘤细胞来源的损伤相关分子模式以及肿瘤相关抗原。这些危险信号极大地增强了免疫细胞向水凝胶内的募集,并通过所吸附的DNA介导的cGAS-STING通路激活,充分活化了树突状细胞(DCs)。活化的DCs将T细胞转化为细胞毒性T淋巴细胞,这些活化的免疫细胞随后通过水凝胶的孔隙迁移至肿瘤组织内部,有效重塑了免疫抑制微环境,从而抑制了肿瘤生长与转移。本研究揭示了一种先前未知的、用于构建安全、易于控制且高效的仿生TLS的方法,为革新当前针对多种肿瘤的联合免疫治疗策略提供了新思路。

抗肿瘤免疫疗法通过利用免疫系统特异性杀伤肿瘤细胞,同时建立长期免疫监视以防止肿瘤复发,从而开创了抗肿瘤治疗的新格局。然而,肿瘤微环境通常存在血管分化不良的情况,导致营养和氧气供应不足以及代谢废物积累。这种恶劣的环境迫使免疫细胞与肿瘤细胞竞争营养物质,引起免疫细胞的代谢适应,进而损害其效应功能。此外,肿瘤细胞表面表达的程序性死亡配体1(PD-L1)等免疫抑制分子可与T细胞发生交互作用,进一步诱导T细胞耗竭。越来越多的证据表明,特定的肿瘤内细菌可加剧免疫抑制微环境,甚至加速肿瘤转移。总体而言,免疫抑制性肿瘤微环境严重限制了抗肿瘤免疫的疗效。

研究人员致力于将免疫抑制的“冷”肿瘤转化为免疫活跃的“热”肿瘤,以增强抗肿瘤免疫治疗的效果。研究表明,光热治疗、放射治疗、化学治疗以及向肿瘤组织递送免疫检查点抑制剂和治疗性抗体等方法均可促进这一转化过程。同时,在这些治疗过程中,被破坏的肿瘤细胞会释放肿瘤相关抗原。树突状细胞(DCs)摄取这些抗原后迁移至肿瘤引流淋巴结,激活T细胞分化为效应T细胞,进而浸润肿瘤组织并发挥免疫功能。然而,免疫细胞在肿瘤内的浸润不足限制了其治疗效果。据推测,肿瘤相关抗原暴露有限以及免疫细胞需要经历复杂的激活与迁移过程,是导致该疗效受到影响的重要原因。

三级淋巴结构(TLSs)是指在病理条件下于非淋巴器官内形成的异位淋巴结构,其特征为淋巴细胞聚集,其结构与功能类似于次级淋巴结。TLSs通常见于自身免疫性疾病、慢性感染和肿瘤中;其在肿瘤中的存在常提示更好的治疗效果和预后。成熟的TLSs为T细胞、B细胞等免疫细胞的活化提供了有利的微环境,从而促进快速有效的抗肿瘤免疫应答。然而,TLSs的自然形成过程缓慢。研究显示,在不施加额外干预的情况下,小鼠体内TLSs的形成至少需要20周。此外,肿瘤相关TLSs具有高度异质性,其成熟度与密度在不同类型和分期的肿瘤中存在显著差异。不成熟的TLSs在促进抗肿瘤免疫方面的作用有限,且TLSs在肿瘤中的定位也会影响其效能。更重要的是,由于肿瘤免疫编辑及免疫抑制微环境的影响,仅有一小部分肿瘤患者体内能检测到自然形成的TLSs。因此,肿瘤的免疫抑制特性及其快速进展使得自然形成的TLSs不足以满足治疗需求。

目前,化学治疗药物、细胞因子、干扰素基因刺激蛋白(STING)激动剂、溶瘤病毒以及淋巴结来源的细胞等已被用于促进TLSs的形成。值得注意的是,这些在肿瘤中促进TLS形成的策略存在安全性隐患。TLS诱导剂的递送效率有限,难以在肿瘤组织中有效且特异地诱导TLS形成;而在非肿瘤组织中形成的TLSs可能增加自身免疫性疾病的风险。此外,既存的血管系统使得肿瘤相关TLSs有可能参与肿瘤转移过程。因此,构建安全、可控、快速形成且高效能的TLSs以改善抗肿瘤免疫,具有至关重要的意义。

近期研究发现,植入小鼠体内的壳聚糖水凝胶(COS)能够招募先天免疫细胞。此外,研究表明不同肿瘤(包括乳腺、肺、卵巢、胰腺、黑色素瘤、骨和脑肿瘤)具有独特的细菌组成。临床数据显示,乳腺癌组织中存在高丰度的大肠杆菌(E. coli),其存在削弱了抗肿瘤效果。因此,本研究构建了一种修饰的COS水凝胶作为仿生TLS,用于对抗预先定植大肠杆菌的小鼠皮下4T1肿瘤模型,进行抗肿瘤免疫治疗。首先将预凝胶化的壳聚糖溶液注射至肿瘤组织邻近部位,并迅速发生原位凝胶化。通过瘤内注射多柔比星(DOX)和抗生素杀死肿瘤细胞及瘤内细菌后,释放的细胞/细菌碎片以及断裂的DNA通过静电相互作用被吸附至水凝胶中。这些被吸附的危险信号有利于水凝胶高效招募多种免疫细胞,包括DCs、T细胞、B细胞、巨噬细胞和中性粒细胞。

值得注意的是,活化的DCs通过激活环状GMP-AMP合成酶(cGAS)-STING信号通路,直接启动细胞毒性T淋巴细胞(CTLs)的活化。这些活化的免疫细胞通过穿越水凝胶的孔隙高效迁移至肿瘤组织,从而引发强烈的抗肿瘤免疫应答,显著抑制了荷瘤小鼠皮下肿瘤的生长和肺转移。这种基于水凝胶的仿生TLS在形成位置、细胞组成和免疫功能方面均与肿瘤相关的成熟TLSs高度相似。与以往的TLS诱导方法不同,此类仿生TLSs无需额外的免疫刺激剂(如STING激动剂或CpG),即可在肿瘤组织特定部位快速形成,并主动为免疫细胞活化创造多种有利条件,从而有效缓解肿瘤组织内的免疫抑制微环境。此外,这些仿生TLSs缺乏包括高内皮微静脉和淋巴管在内的血管结构,因此避免了血管系统介导的肿瘤转移风险。综上所述,这类受生物材料启发的仿生TLSs可应用于多种肿瘤的治疗。

原文链接:https://www.science.org/doi/10.1126/sciadv.adz5078

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  1. CONNECT:[ UseTime:0.001251s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001688s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002607s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001265s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001406s ]
  6. SELECT * FROM `set` [ RunTime:0.005213s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001578s ]
  8. SELECT * FROM `article` WHERE `id` = 471601 LIMIT 1 [ RunTime:0.007140s ]
  9. UPDATE `article` SET `lasttime` = 1770837148 WHERE `id` = 471601 [ RunTime:0.048903s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.013515s ]
  11. SELECT * FROM `article` WHERE `id` < 471601 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000481s ]
  12. SELECT * FROM `article` WHERE `id` > 471601 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000694s ]
  13. SELECT * FROM `article` WHERE `id` < 471601 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006532s ]
  14. SELECT * FROM `article` WHERE `id` < 471601 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005113s ]
  15. SELECT * FROM `article` WHERE `id` < 471601 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.079586s ]
0.339736s