蛋白激酶C三角酶调节单核细胞,并阻碍了癌症免疫治疗的反应
Mehdi Chaib1, Jeremiah R Holt2, Emilie L Fisher3
1Department of Pharmaceutical Sciences, College of Pharmacy, The University of Tennessee Health Science Center, Memphis, TN 38163, USA.
在单核细胞 (MPs) 中准蛋白激酶C三角酶 (PKCδ) 可以增强抗PD-1疗法. 在MP中删除PKCδ可以减少瘤生长,增强抗瘤免疫力,改善对免疫检查点封锁的反应.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- 单核细胞 (MPs) 对组织平衡至关重要,但也促进瘤进展和免疫检查点阻塞 (ICB) 抵抗.
- 针对国会议员是一个有希望的战略,以提高ICB疗法的疗效.
研究的目的:
- 研究瘤微环境中的MP中蛋白激酶C三角酶 (PKCδ) 的作用.
- 确定向PKCδ是否可以增强抗瘤免疫力和ICB反应.
主要方法:
- 使用PKCδ淘汰赛 (PKCδ-/-) 小鼠和野生型 (PKCδ+/+) littermates用于瘤植入和抗PD-1治疗研究.
- 分析了免疫细胞种群,TH1-歪曲的免疫反应,抗原呈现和瘤中的T细胞激活.
- 研究了MP枯竭和PKCδ-/-巨细胞的收养转移对瘤生长的影响.
主要成果:
- 与野生型对照相比,PKCδ-/-小鼠表现出瘤进展的减少和抗PD-1治疗的增强反应.
- 来自PKCδ-/-小鼠的瘤显示TH1-扭曲的免疫环境,抗原呈现增加和T细胞激活.
- 在对照小鼠中,MPs的耗尽影响了瘤生长,但在PKCδ-/-小鼠中没有,这表明PKCδ对于MP介导的瘤促进至关重要.
- 在野生型小鼠中,采用PKCδ-/-巨细胞的转移显著延迟了瘤生长和增加了瘤内T细胞激活.
- PKCδ缺乏通过激活I型和II型干扰素信号通路来重新编程MPs.
结论:
- PKCδ是瘤中MP功能的关键调节者,有助于瘤进展和ICB耐药性.
- 针对MPs中的PKCδ具有重编程这些细胞的潜力,以增强抗瘤免疫力并提高ICB的疗效.
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