STAT3

信号转导及转录激活蛋白3（英語：Signal transducer and activator of transcription 3，STAT3）是一种由人类基因STAT3 编码的转录因子。 STAT3是STAT蛋白家族的成员。受到细胞因子和生长因子的调节，STAT3被受体相关的Janus激酶（JAK）磷酸化，形成同源或异源二聚体，并转移到细胞核，在那里它们起转录激活剂的作用。具体而言，干扰素，表皮生长因子（EGF），白细胞介素（IL-5和IL-6）等配体作用于受体，导致酪氨酸705磷酸化后，STAT3被激活。此外，STAT3可能通过丝裂原活化蛋白激酶（MAPK）和c-src非受体酪氨酸激酶磷酸化丝氨酸727而激活。STAT3介导响应细胞刺激的各种基因的表达，因此在许多细胞过程如细胞生长和细胞凋亡中起关键作用。 当原肠胚形成开始时，STAT3缺陷的小鼠胚胎不能在胚胎发育第7天以后发育。看来在这些发育的早期阶段，STAT3激活是胚胎干细胞（ESC）自我更新所必需的。事实上，如果STAT3通过其他方式被激活，LIF可以被省略，该LIF被提供给小鼠ESC培养物以保持其未分化状态。 STAT3对于TH17辅助性T细胞的分化至关重要，TH17辅助性T细胞已涉及多种自體免疫性疾病。在病毒感染期间，缺乏T细胞中STAT3的小鼠显示产生T-滤泡辅助（Tfh）细胞的能力受损，并且不能维持基于抗体的免疫性。 STAT3能与下列蛋白質发生交互作用： AR ELP2 EP300 EGFR HIF1A JAK1 JUN KHDRBS1 MTOR MYOD1 NDUFA13 NFKB1 NR3C1 NCOA1 PML RAC1 RELA RET RPA2 STAT1 Src TRIP10 Akira S, Nishio Y, Inoue M, Wang XJ, Wei S, Matsusaka T, Yoshida K, Sudo T, Naruto M, Kishimoto T. Molecular cloning of APRF, a novel IFN-stimulated gene factor 3 p91-related transcription factor involved in the gp130-mediated signaling pathway. Cell. 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