TCR信号诱导STAT3酸化以促进TH17细胞分化
Zhen Qin1, Ruining Wang1, Ping Hou1
1Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.
The Journal of experimental medicine
|February 7, 2024
概括
T细胞分化依赖于细胞因子信号,但TCR刺激也会激活STAT3. 这一意想不到的发现揭示了TCR信号如何控制TH17和Treg细胞平衡,为自身免疫性疾病提供了新的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子医学是分子医学.
背景情况:
- 辅助T细胞17 (TH17) 的分化由IL-6和IL-23等细胞因子通过STAT3信号调节.
- 单单由细胞因子诱导的STAT3酸化就会导致中度的TH17分化.
- 在T细胞命运决定中整合T细胞受体 (TCR) 和细胞因子信号的精确机制仍然不完全理解.
研究的目的:
- 研究T细胞受体 (TCR) 刺激在STAT3酸化中的作用及其对TH17/Treg细胞分化的影响.
- 阐明TCR刺激影响STAT3激活的信号通路.
- 探索针对自身免疫性疾病中TCR-STAT3相互作用的治疗潜力.
主要方法:
- 利用化学抑制剂 (Srci1) 和与疾病相关的STAT3突变来探测Lck/Fyn激酶活性和Lck/Fyn-STAT3相互作用.
- 分析了由TCR刺激和细胞因子 (IL-6/IL-23) 单独和组合诱导的Y705的STAT3酸化.
- 评估了药理和遗传干预对TH17和调控性T (Treg) 细胞分化 in vitro的影响.
- 在实验性自身免疫脑炎 (EAE) 的小鼠模型中评估了针对TCR-STAT3途径的治疗疗效.
主要成果:
- 单独通过TCR刺激就会通过Lck/Fyn激酶诱导STAT3的酸化.
- TCR刺激与IL-6/IL-23协同作用,在Y705实现强大的STAT3酸化,这对于最佳TH17分化至关重要.
- 抑制Lck/Fyn或破坏Lck/Fyn-STAT3相互作用会选择性地破坏TCR驱动的STAT3酸化,导致抑制TH17分化和转化为FOXP3+Treg细胞.
- 药理上抑制Lck/Fyn (Srci1) 或破坏Lck/Fyn-STAT3相互作用改善了TH17细胞介导的EAE.
结论:
- 通过Lck/Fyn依赖的STAT3酸化,TCR信号传递在确定TH17和Treg细胞命运之间的平衡方面发挥着至关重要的,以前未被认可的作用.
- 整合TCR和细胞因子信号决定了T细胞系的承诺.
- 针对Lck/Fyn-STAT3轴为由异常TH17细胞反应驱动的自身免疫疾病提供了一个有希望的治疗策略.
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