MDA5型
自噬
下调和上调
先天免疫系统
干扰素
化学
细胞生物学
转染
病毒复制
病毒
生物
病毒学
生物化学
免疫系统
核糖核酸
免疫学
基因
细胞凋亡
RNA干扰
作者
Zaohe Wu,Tao Hu,Weiqiong Chen,Yao Cheng,Mingshu Wang,Renyong Jia,Dekang Zhu,Mafeng Liu,Xinxin Zhao,Qiao Yang,Ying Wu,Shaqiu Zhang,Juan Huang,Sai Mao,Xumin Ou,Qun Gao,Di Sun,Anchun Cheng,Shun Chen
标识
DOI:10.1096/fj.202101916rrr
摘要
Abstract Duck Tembusu virus (TMUV) is a serious avian pathogen causing a decline in egg production, but the mechanism of the virus that breaks through the innate immune system is poorly understood. Here, we show that TMUV inhibits poly(I:C)‐induced interferon (IFN) production. Because poly(I:C) transfection can specifically activate the MDA5 pathway in duck primary cells, we found that infection with TMUV can specifically target MDA5 and lead to its degradation. MDA5 downregulation could be blocked by the autophagy inhibitor 3‐methyladenine (3‐MA) but not a proteasome inhibitor, strongly implicating MDA5 degradation as an autophagy‐related degradation pathway. Pretreatment with 3‐MA enhanced the expression of MDA5 and inhibited TMUV replication. To screen TMUV proteins that degraded MDA5, the TMUV replicon and MDA5‐Flag were cotransfected into cells, and the western blot analysis showed that nonstructural 2B (NS2B) can degrade MDA5 in a dose‐dependent manner. Dual‐luciferase assays indicate that NS2B alone inhibits MDA5‐ or poly(I:C)‐mediated IFN production. NS2B binds MDA5 in the presence of 3‐MA. The deletion of the amino acids of NS2B from residues 51 to 92 (hydrophilic area) restored the expression of MDA5 and relieved the MDA5‐mediated IFNβ production inhibition by NS2B, indicating that the hydrophilic area of NS2B is important for its interaction with host innate immunity.
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