
MICA与MICB是一种在肿瘤细胞DNA受损后表达的应激蛋白,属于MHC类I相关分子,其结构与MHC类I分子相似,由重链和轻链组成。MICA/B主要表达在肿瘤细胞表面,受DNA损伤和cGAS-STING信号通路调控,其表达水平与肿瘤的发生、发展和预后密切相关。研究发现大多数肿瘤细胞(如白血病、淋巴瘤、非小细胞肺癌、乳腺癌、胃癌、肝癌等)中均发现MICA/B的表达。因此MICA/B的表达水平可以作为肿瘤诊断的生物标志物之一。另外,MICA/B可通过激活自然杀伤细胞(NK细胞)受体NKG2D标记肿瘤细胞,或与T细胞受体(TCR)结合来激活调节免疫反应来杀伤肿瘤细胞,可作为肿瘤免疫检查点的潜在治疗性靶点。
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