早期的氨酸可用性减弱了T细胞耗尽的作用
Piyush Sharma1, Ao Guo2,3, Suresh Poudel2
1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA. piyush.sharma@stjude.org.
Nature immunology
|July 23, 2025
概括
在T细胞受体 (TCR) 激活过程中早期限制 metionin 促进T细胞疲劳. 氨酸的可用性调节KCa3.1甲基化,影响信号传递和NFAT1激活,从而影响疾病模型中的T细胞功能.
科学领域:
- 免疫学 免疫学 免疫学
- 代谢途径 代谢途径
- 细胞信号传递 细胞信号传递
背景情况:
- T细胞受体 (TCR) 的激活对于适应性免疫非常重要.
- 营养素的可用性,如甲氨酸 (Met),可以影响免疫细胞的功能.
- 在T细胞激活的早期事件决定了长期的细胞命运和功能.
研究的目的:
- 调查早期T细胞激活期间的氨酸可用性和TCR信号之间的相互作用.
- 确定早期代谢条件对随后的T细胞命运的影响,包括T细胞耗尽.
- 确定将营养物质可用性与T细胞激活通路联系起来的分子机制.
主要方法:
- 在不同度的甲氨酸的存在下,研究了T细胞激活.
- 分析了 (Ca2+) 流入,NFAT1激活和促进体占用.
- 检查了蛋白质 arginine 甲基组中的变化,重点关注 KCa3.1 甲基化.
- 在小鼠瘤和感染模型中评估T细胞功能.
主要成果:
- 在TCR激活的最初30分钟内限制甲因增加了Ca2+流入和NFAT1激活,导致T细胞耗尽.
- 确定了KCa3.1的氨酸甲基化作为Ca2+介导NFAT1信号的关键调节者.
- 废除KCa3.1氨酸甲基化导致NFAT1核局部化增加和T细胞功能失调.
- 早期的氨酸补充剂减少了瘤透T细胞中的核NFAT1,并增强了抗瘤活性.
结论:
- 早期的氨酸可用性关键调节T细胞激活和命运.
- 依赖 metionin 的 KCa3.1 甲基化是一种控制 T 细胞信号和功能的新机制.
- 针对早期的 metionin代谢有潜力增强抗瘤免疫力.
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