由STING诱导的调节性B细胞损害了癌症免疫中的NK功能
Sirui Li1,2,3, Bhalchandra Mirlekar1,2, Brandon M Johnson1,3
1Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Nature
|October 5, 2022
概括
干扰素基因刺激剂 (STING) 激活剂可以扩大调控性B细胞,阻碍抗瘤免疫力. 在B细胞中准这种STING- IL-35通路可以通过增强自然杀伤细胞反应来改善癌症治疗.
科学领域:
- 免疫学
- 癌症学
- 癌症生物学
背景情况:
- 瘤的微环境通常会抑制免疫反应,从而限制癌症治疗的有效性.
- 干扰素基因刺激剂 (STING) 激活天生的免疫力,但在癌症治疗中面临抵抗力.
- 在固体瘤中对STING激动剂的抗药性机制尚不清楚.
研究的目的:
- 研究STING激动剂对瘤微环境的影响.
- 阐明STING激动剂影响瘤内的免疫细胞的机制.
- 确定新的治疗策略,以克服对基于STING的癌症治疗的耐药性.
主要方法:
- 在人类和小鼠胰腺癌模型中使用各种STING激动剂 (包括cGAMP).
- 对B细胞群的分析,特别是表达调节性B细胞的IL-35.
- 评估B细胞中的STING信号通路 (IRF3,I型干扰素).
- 在B细胞中对STING通路调节后的瘤控制的评估.
- 研究IL-35阻断或基因切除对瘤生长的影响.
- 自然杀手 (NK) 细胞增殖和抗瘤活性的评估.
主要成果:
- 包括cGAMP在内的STING激动剂在胰腺癌中诱导IL-35+调节性B细胞的扩张.
- 在B细胞中cGAMP诱导的IL-35表达取决于IRF3,但独立于I型干扰素.
- 在临床前模型中,B细胞中STING信号的丧失增强了瘤的控制.
- 在B细胞中阻断或消去IL-35可以减少瘤的生长.
- 在B细胞中,STING-IL-35轴抑制了自然杀手细胞的增殖和抗瘤反应.
结论:
- 矛盾的是,STING激动剂可以通过IL-35通路扩大调节性B细胞,从而促进免疫抑制.
- 在B细胞中,这种STING-IL-35轴是STING激动剂单一治疗的内在障碍.
- 针对B细胞中的STING- IL-35通路,可能与IL-35阻断相结合,提供一种增强NK细胞介导的抗瘤免疫力和克服治疗耐药性的策略.
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