硫酸胆酸是MAIT细胞的宿主衍生联体
Emi Ito1,2, Shinsuke Inuki3, Yoshihiro Izumi4
1Department of Molecular Immunology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan.
Science immunology
|January 26, 2024
概括
胆酸7-硫酸盐 (CA7S) 是一种来自宿主的代谢物,被粘膜相关的不变T细胞 (MAIT) 识别. 这种内源性抗原促进MAIT细胞的发育和生存,与驱动增殖的外来抗原不同.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 代谢学 代谢学 代谢学
背景情况:
- 粘膜关联不变T细胞 (MAIT) 是与生俱来的类似的淋巴细胞,能够识别细菌代谢物.
- 由MAIT细胞识别的宿主衍生抗原的存在在很大程度上仍未被探索.
- MAIT细胞存在于各种宿主组织中,表明与内源分子的潜在相互作用.
研究的目的:
- 为了识别由MAIT细胞识别的内源抗原.
- 研究宿主衍生代谢物在MAIT细胞发育和功能中的作用.
- 为了区分MAIT细胞激活的内源抗原与外源抗原的功能结果.
主要方法:
- 具有约束力的测试,以评估胆酸7-硫酸盐 (CA7S) 与MR1蛋白之间的相互作用.
- 没有细菌的小鼠模型来评估宿主衍生代谢物的对MAIT细胞群的影响.
- 酶删除研究 (Sult2a1-8淘汰赛) 调查CA7S.的合成途径.
- 基因表达分析以描述MAIT细胞对CA7S和外来抗原的反应.
主要成果:
- 胆酸7-硫酸 (CA7S) 是一种硫酸胆酸,它与MR1蛋白结合,并被MAIT细胞识别.
- 在没有细菌的小鼠中,CA7S水平显著降低,这表明其来自宿主的性质.
- 删除硫转移酶可以减少胸膜MAIT细胞数量.
- 识别CA7S促进了MAIT细胞存活率和恒常基因表达.
- 对外来抗原5-OP-RU的识别诱导了MAIT细胞的增殖和炎症基因表达.
结论:
- 胆酸7-硫酸盐 (CA7S) 被确定为MAIT细胞的内源抗原.
- 在MAIT细胞发育和恒温中,CA7S起着至关重要的作用.
- MAIT细胞对内源性 (CA7S) 和异源性 (5-OP-RU) 抗原表现出不同的功能反应,突出了差异性激活通路.
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