内氨基酸缺乏症限制了CD8+ T细胞效应体的功能
Yan-Ting Chen1,2, Ya-Hui Lin2, Jahan Rahman2,3
1Louis V. Gerstner Jr. Graduate School of Biomedical Sciences, New York, NY, USA.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
瘤微环境的氨基酸水平限制了CD8+T细胞蛋白质的合成和功能. 恢复氨基酸可用性可以增强T细胞效应器功能和抗瘤免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 代谢调节 代谢调节 代谢调节 代谢调节
背景情况:
- CD8+ T细胞对于抗瘤免疫是至关重要的.
- 瘤透的CD8+T细胞往往失去了效应器功能,限制了治疗疗效.
- 尽管有足够的细胞毒性蛋白质转录,但这种功能障碍仍然存在,这表明了转录后调节.
研究的目的:
- 研究蛋白质合成和氨基酸可用性在瘤微环境中的CD8+T细胞功能障碍中的作用.
- 阐明营养物质可用性影响T细胞功能的机制.
主要方法:
- 对来自瘤和瘤排水淋巴结的抗原特异性CD8+T细胞中的mRNA转化率的分析.
- 研究tRNA放电,综合应激反应和mTORC1信号.
- 操纵谷氨酸酶活性和氨基酸载体SLC6A15的表达.
主要成果:
- 内氨基酸可用性通过抑制蛋白质合成来限制CD8+T细胞的细胞毒性能力.
- 由于氨基酸的需求增加和可用性减少,mRNA转化率在瘤透的T细胞中被抑制.
- 氨基酸依赖的tRNA释放抑制的蛋白质合成,独立于应激反应或mTORC1.
- 恢复谷氨酸酶活性或SLC6A15表达挽救了CD8+T细胞效应器功能.
结论:
- 瘤微环境中的营养可用性是CD8+T细胞功能的关键决定因素.
- 改变的氨基酸代谢和可用性会损害T细胞蛋白质合成和抗瘤免疫力.
- 提高T细胞特异性氨基酸的可用性是一种潜在的策略,可以增强抗瘤免疫力.
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