DNA-PKcs控制了CD4和CD8T细胞中LAT依赖的信号传递
bioRxiv : the preprint server for biology
|March 31, 2025
概括
取决于DNA的蛋白激酶催化子单元 (DNA-PKcs) 与免疫突触中的T细胞激活链接器 (LAT) 相互作用. 这种相互作用对T细胞信号传递至关重要,影响T细胞功能,瘤免疫和移植排斥.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 免疫突触 (IS) 对T细胞激活至关重要.
- 激活T细胞的链接器 (LAT) 作为T细胞受体 (TCR) 信号在IS的支架.
- 酸化LAT氨酸对于信号体的形成至关重要.
研究的目的:
- 研究DNA依赖蛋白激酶催化子单元 (DNA-PKcs) 在T细胞激活中的作用.
- 确定DNA-PKcs和LAT在免疫突触中的相互作用.
- 为了阐明DNA-PKcs介导的LAT酸化的功能后果.
主要方法:
- 同免疫沉检测蛋白质相互作用.
- 免疫光显微镜可视化在IS的蛋白质定位.
- 位点定向的突变发生,以确定化残留物.
- 特定于T细胞的DNA-PKcs淘汰赛小鼠模型.
- 评估瘤生长和全源移植排斥.
主要成果:
- DNA-PKcs 与LAT相互作用,并在T细胞激活时定位到IS.
- 抑制DNA-PKcs可以减少LAT在IS的局部化.
- DNA-PKcs在S224和S241血清上化LAT,影响LAT的氨酸酸化和蛋白质结合.
- 在T细胞中DNA-PKcs的损失会损害瘤免疫力和全源移植排斥.
结论:
- DNA-PKcs是免疫突触中LAT功能的关键调节者.
- 通过DNA-PKcs介导的LAT酸化对于有效的T细胞介导免疫反应至关重要.
- DNA-PKcs代表了调节T细胞功能的潜在治疗标.
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