生物
ATG5型
干扰素
犬新孢子虫
自噬
信号转导
先天免疫系统
基因敲除
细胞生物学
分子生物学
基因
病毒学
受体
免疫学
遗传学
细胞凋亡
抗体
弓形虫
作者
Xiaoqi Chen,Wanwan Zhang,Zhe Hu,Kuopeng Cui,Meisheng Yi,Kuntong Jia
标识
DOI:10.1016/j.fsi.2022.07.041
摘要
Autophagy-related gene 5 (Atg5), an essential component of autophagy machinery, is associated with innate immune responses. Here, the Atg5 of sea perch (Lateolabrax japonicus) (LjAtg5) was cloned and its role in regulating autophagy and interferon (IFN) response during red-spotted grouper nervous necrosis virus (RGNNV) infection was investigated. The LjAtg5 cDNA encoded a polypeptide of 275 amino acids with an APG5 domain, and had the closet genetic relationship with Micropterus salmoides Atg5. Autophagic detection showed LjAtg5 was conserved in inducing cell autophagy. Spatial expression analysis revealed LjAtg5 had a higher expression level in liver, brain, and kidney tissues of RGNNV-infected sea perch compared with the control group. In RGNNV-infected LJB cells, overexpression of LjAtg5 significantly increased the mRNA and protein levels of capsid protein, whereas knockdown of LjAtg5 led to the opposite effect, indicating LjAtg5 played a pro-viral role during RGNNV infection. Furthermore, dual luciferase reporter assay revealed LjAtg5 significantly suppressed the activation of sea perch type I IFN promoter in vitro, and overexpression of LjAtg5 strongly weaken the expression of genes related to the RIG-I-like receptors (RLRs) signaling pathway and IFN stimulated genes. These results suggested LjAtg5 promoted RGNNV infection by negatively regulating RLRs-IFN signaling pathway.
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