J Autoimmunity:RIG-I的核转位促进细胞凋亡

2022-08-16 彼岸河边草 MedSci原创

核RIG-I除了作为细胞溶质先天传感器激活IFN-I表达外,在诱导细胞凋亡中的非典型作用。这项研究为通过核RIG-I-APEX1相互作用调节感染、IFN-I和自身免疫性疾病提供了新的见解。

细胞死亡对于清除受损细胞,如病毒感染细胞很重要,并且与系统性红斑狼疮(SLE)等自身免疫性疾病的发病机制密切相关。视黄酸诱导基因-I (RIG-I)是一种细胞溶质RNA先天传感器,可通过诱导I型干扰素(IFN-I)的产生来触发抗病毒先天反应。然而,RIG-I的功能,一旦在病毒感染晚期,当IFN-I产生几乎终止时从细胞质转移到细胞核,仍然知之甚少。

在这篇研究中,曹雪涛老师团队报道了病毒感染晚期RIG-I诱导核转位RIG-I在病毒感染的相对晚期阶段存在于在巨噬细胞和成纤维细胞的细胞核中,此时病毒感染诱导的IFNs产生几乎终止。RIG-I存在于SLE患者的外周血单个核细胞(PBMC),但是单独的 IFN-α刺激不能诱导RIG-I在细胞核中积累。通过给RIG-1加蛋白标签、高通量筛选和免疫共沉淀加蛋白质谱的方法观察到在活细胞中,RIG-I与无嘌呤/无嘧啶内切脱氧核糖核酸酶1APEX1)的前20个氨基酸相互作用并减弱APEX1的抗凋亡特性。因此,RIG-1病毒感染晚期以独立通过IFN-I抑制病毒感染的方式促进RNA病毒和DNA病毒感染的细胞凋亡,从而限制病毒复制避免增加病毒载量。

总之,研究结果揭示了核RIG-I除了作为细胞溶质先天传感器激活IFN-I表达外,在诱导细胞凋亡中的非典型作用。这项研究为通过核RIG-I-APEX1相互作用调节感染、IFN-I和自身免疫性疾病提供了新的见解,超越了其公认的dsRNA传感作用。

出处:Wang C, Zhou W, Liu Y, Xu Y, Zhang X, Jiang C, Jiang M, Cao X. Nuclear translocation of RIG-I promotes cellular apoptosis. J Autoimmun. 2022 Jun;130:102840. doi: 10.1016/j.jaut.2022.102840. Epub 2022 May 19. PMID: 35598407.

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    2022-12-21 lifestar
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