抑制外体PD-L1诱导全身抗瘤免疫和记忆
Mauro Poggio1, Tianyi Hu1, Chien-Chun Pai2
1Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edith Broad Institute for Regeneration Medicine, University of California, San Francisco, San Francisco, CA 94143, USA.
瘤细胞在外体内分泌PD-L1,抑制T细胞. 阻断外体PD- L1抑制瘤生长,并可能克服对当前抗体治疗的抗性.
科学领域:
- 免疫学
- 癌症学
- 细胞生物学
背景情况:
- 在瘤细胞上编程的死亡配体1 (PD-L1) 与T细胞结合,抑制抗瘤免疫力.
- 抗体阻断PD- L1可以在一些癌症患者中引起持久缓解.
- 确切的PD-L1免疫抑制作用机制仍在研究中.
研究的目的:
- 调查PD-L1活动的替代机制,包括其在瘤衍生外体中的分泌.
- 确定外体PD- L1的向是否可以抑制瘤生长,特别是在抗PD- L1抗体的模型中.
- 探索阻断外体PD-L1的治疗潜力.
主要方法:
- 使用瘤生长和免疫反应模型.
- 研究了外体PD-L1在瘤微环境和排泄淋巴结中的抑制作用.
- 评估了消除或阻断外体PD- L1对瘤生长的疗效.
- 研究了抗PD-L1抗体和外体PD-L1阻塞的联合作用.
主要成果:
- 即使在抗PD- L1抗体模型中,除去外体PD- L1也显著抑制了瘤生长.
- 由瘤分泌的外体PD- L1抑制了淋巴结排水中的T细胞激活.
- 在缺陷模型中,对外体PD- L1的系统注射挽救了瘤的生长.
- 缺少外体PD-L1的瘤细胞抑制了远部瘤的生长.
- 与抗PD- L1抗体具有添加作用.
结论:
- 外体PD-L1代表了瘤免疫抑制的新机制.
- 针对外体PD- L1提供了一种潜在的治疗策略,以克服对当前抗PD- L1抗体治疗的耐药性.
- 阻断外体PD- L1可以增强抗瘤免疫反应并改善患者的治疗结果.
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