用脂质独立的方式识别CD1d的 γδ T 细胞受体
Michael T Rice1, Sachith D Gunasinghe1,2, Chhon Ling Sok1
1Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia.
Nature communications
|December 28, 2025
概括
人类马三角型T细胞受体 (γδ TCRs) 可以独立于脂质抗原识别CD1d分子. 这一发现揭示了T细胞激活和抗原呈现的新机制.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- CD1d分子向T细胞呈现脂质抗原,包括αβ和γδT细胞.
- I型自然杀手T (NKT) 细胞对表现为α-galactosylceramide (α-GalCer) 的CD1d具有很高的特异性.
- CD1d受限制的 γδ T 细胞的脂质特异性尚不清楚.
研究的目的:
- 研究人类 γδ T 细胞受体 (TCR) 对 CD1d 的脂质特异性.
- 阐明 CD1d. 的 γδ TCR 识别背后的分子机制.
主要方法:
- 微角X射线散射 (SAXS) 用于研究γδ TCR-CD1d结合.
- 功能性测试用于评估T细胞激活.
- 一个 γδ TCR-CD1d 复合物的晶体结构分析.
主要成果:
- 人类的γδ TCRs以依赖脂质或依赖脂质的独立方式识别CD1d,并具有不同的亲和力.
- γδ TCR-CD1d结合亲和力不能可靠地预测T细胞激活.
- 呈现内源性脂质的CD1d足以激活T细胞,γδ TCR-CD3聚类和酸化.
- 结构分析显示,γδ TCRs不会接触CD1d结合裂内的脂质抗原.
结论:
- γδ TCRs可以独立于特定的脂质抗原识别CD1d.
- 这种脂质独立的识别提供了替代T细胞激活途径的分子基础.
- 这些发现挑战了所有CD1d受限T细胞严格的脂质抗原呈现的范式.
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