人类树突细胞中MHC I载荷复合物的动态互动组
Martina Barends1, Nicole Koller1, Christian Schölz2
1Institute of Biochemistry, Biocenter, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany.
概括
树突细胞在成熟过程中,在载复合体 (PLC) 中动态招募新的蛋白质. 然而,这些添加物在MHC I抗原呈现中起着冗余的作用,揭示了免疫细胞机械的可塑性.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 树突细胞 (DCs) 对于启动适应性免疫至关重要,通过通过主要基因相容性复合 (MHC) 分子向T细胞呈现抗原.
- 大型冠状病毒I类 (MHC I) 抗原呈现依赖于载复合体 (PLC),该复合体的中心是与抗原处理 (TAP) 相关的载体,该载体位于内质网膜 (ER) 中.
- 精确的组成和PLC的动态,特别是在DC,仍然不完全理解.
研究的目的:
- 研究人类树突细胞分化和成熟过程中PLC组成的动态变化.
- 在DC中识别PLC的新型蛋白相互作用体.
- 评估MHC I抗原呈现中新发现的PLC组件的功能意义.
主要方法:
- 人体单细胞的分离和分化成不成熟和成熟的树突细胞 (DCs).
- 同免疫沉和近距离结合测试以识别和定位与PLC相关的蛋白质.
- 通过CRISPR/Cas9基因编辑删除关键的PLC组件,并通过流细胞计评估MHC I表面表达.
主要成果:
- 在DC成熟过程中,招募B细胞受体相关蛋白31 (BAP31),囊泡相关膜蛋白相关蛋白A (VAPA) 和扩展的synaptotagmin-1 (ESYT1) 到PLC.
- 这些蛋白质定位在PLC附近,与ER出口和膜接触部位有关.
- BAP31,VAPA或ESYT1的单基因删除没有损害MHC I抗原的处理,这表明DCs中的冗余作用.
结论:
- 树突细胞中的载复合体在成熟过程中表现出动态组成和可塑性,结合了新型蛋白质.
- 尽管它们与BAP31,VAPA和ESYT1有关,但它们对于DC中的MHC I抗原呈现并非必不可少,这表明功能冗余.
- 这些发现为免疫细胞中抗原处理机械的适应性提供了新的见解,与细胞系的观察不同.
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