颗粒细胞巨菌殖民地刺激因子对溶解和膜结合ICOS的影响,结合免疫检查点阻塞
Xiaoyu Li1,2,3, Jingjing Li1,2,3, Yue Zheng4
1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
Cancer immunology research
|June 1, 2023
概括
颗粒细胞-巨细胞殖民地刺激因子 (GM-CSF) 通过增加膜结合诱导性T细胞共刺激器 (ICOS) 和促进树突细胞发育来增强免疫检查点阻塞疗法. 可溶性ICOS拼接变体,抑制免疫力,可以作为治疗反应的生物标志物.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 生物化学 生物化学
背景情况:
- 免疫检查点阻塞 (ICB) 疗法已经彻底改变了癌症治疗,但需要提高疗效和降低毒性.
- 与ipilimumab结合的粒细胞巨细胞殖民地刺激因子 (GM-CSF) 与ipilimumab单独相比显示出更高的疗效和更少的高度不良事件.
- 在接受伊皮利马布加GM-CSF的患者中观察到ICOS+ T细胞 (CD4+和CD8+) 的增加.
研究的目的:
- 阐明GM-CSF影响诱导性T细胞辅助刺激器 (ICOS) 表达和临床结果的机制.
- 在响应GM-CSF和ipilimumab治疗时,区分可溶性ICOS拼接变体与膜结合ICOS的作用.
- 研究可溶性ICOS拼接变种作为ICB疗效的预测生物标志物的潜力.
主要方法:
- 在接受单独ipilimumab治疗的患者的外周血液中的ICOS+ T细胞的量化与ipilimumab加GM-CSF.
- 分析可溶性ICOS拼接变体及其对免疫抑制的功能影响.
- 评估GM-CSF对膜结合ICOS表达的影响,包括IL-12依赖.
- 可溶性ICOS水平与治疗患者的临床结果的相关性.
主要成果:
- 鉴定出ICOS拼接变体是一种分泌的免疫抑制因子.
- 患者中可溶性ICOS拼接变体的水平与临床结果相关.
- 在依赖IL-12的方式中,GM-CSF增加了膜结合的ICOS.
- 转基因-CSF并没有增加可溶性ICOS水平,但增强了树突细胞的发育.
结论:
- 可溶性ICOS拼接变种有助于免疫抑制,并可作为GM-CSF和ICB疗法的生物标志物.
- 通过增加膜结合ICOS和促进树突细胞成熟,GM-CSF增强了ICB的疗效.
- 了解可溶性和膜结合ICOS的不同作用对于优化癌症免疫治疗至关重要.
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