胰腺瘤微环境的重编程通过艾洛基因表达病毒疗法引起瘤排斥,并改善免疫疗法反应
Mulu Z Tesfay1, Aleksandra Cios2,3, Zetao Cheng2,3
1Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
bioRxiv : the preprint server for biology
|September 26, 2025
概括
一种新型瘤解毒病毒rVMG-H-2Kk,被设计成表达外来抗原,通过触发免疫反应,有效地对抗胰腺癌. 与检查点抑制剂的联合治疗提高了存活率,并在胰腺管道腺癌模型中建立了持久的抗瘤免疫力.
科学领域:
- 在瘤学瘤学.
- 免疫治疗是一种免疫疗法.
- 病毒学 病毒学
背景情况:
- 胰腺管道腺癌 (PDAC) 由于其免疫抑制性瘤微环境 (TME),限制T细胞透和免疫疗法的有效性,提出了挑战.
- 目前用于PDAC的治疗方法与低新抗原负担和对免疫疗法的耐药性作斗争.
研究的目的:
- 开发一种新的瘤性病毒策略,rVMG-H-2Kk,利用移植排斥机制来增强抗PDAC免疫力.
- 评估rVMG-H-2Kk在临床前PDAC模型中的疗效,无论是单一治疗还是与检查点封锁结合使用.
主要方法:
- 重组囊泡性口腔炎病毒 (rVMG) 载体的工程工程,以表达小鼠H-2Kk MHC I类异抗原 (rVMG-H-2Kk).
- 在体外表征rVMG-H-2Kk的复制,细胞分解活性和诱导抗原呈现机制.
- 在免疫能力强的PDAC模型中的体内研究涉及内和全身输送rVMG-H-2Kk,其次是多重免疫组织化学,免疫类型和空间转录学.
- 使用抗PD-1和抗CTLA-4检查点阻塞的组合疗法实验,以及瘤再挑战试验.
主要成果:
- 在体外,rVMG-H-2Kk表现出强大的复制和细胞分解活性,对H-2Kk,H-2Kb和抗原呈现基因进行上调.
- 在体内,rVMG-H-2Kk治疗延迟了瘤进展,并改善了PDAC模型中的存活率,诱导了TME重塑,增加了T细胞和减少了纤维化.
- 使用rVMG-H-2Kk和检查点抑制剂的联合治疗显著提高了生存率,并建立了持久的抗瘤记忆,幸存的小鼠抵御了瘤复发.
结论:
- rVMG-H-2Kk代表了一个新的免疫治疗平台,用于将免疫冷PDAC转化为免疫热瘤.
- 这种方法使PDAC对免疫检查点抑制剂敏感,并建立长期的抗瘤免疫力.
- 该策略有效地克服了PDAC的免疫抑制TME,并有望改善患者的治疗结果.
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