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抗原呈递细胞

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抗原呈递细胞(英语:antigen-presenting cell,简称APC)也称抗原提呈细胞辅佐细胞抗原呈现细胞,是指在免疫反应过程中,能将抗原物质提呈给T细胞的一类辅佐细胞。其细胞表面的MHC分子可以和抗原肽段结合,进而为T细胞表面的T细胞受体(TCRs)所识别。

APC是一群异质性细胞,可大致分为两类:专职(professional)抗原呈递细胞和兼职(non-professional)抗原呈递细胞,前者同时表达MHC-I类和MHC-II类分子,后者仅表达MHC-I类分子。专职抗原呈递细胞主要包括白细胞中的巨噬细胞B细胞树突状细胞;兼职抗原呈递细胞则包含其它有核体细胞,例如内皮细胞细胞因子的影响下,可具提呈细胞的功能。

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抗原呈递细胞
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