Hepatitis B Surface Antigen Suppresses the Activation of Nuclear Factor Kappa B Pathway via Interaction With the TAK1-TAB2 Complex.

Hepatitis B Surface Antigen Suppresses the Activation of Nuclear Factor Kappa B Pathway via Interaction With the TAK1-TAB2 Complex.
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B型肝炎表面抗原通过与TAK 1-TAB 2复合物的相互作用抑制核因子κ B途径的活化。

DOI:
10.3389/fimmu.2021.618196
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发表时间:
2021
影响因子:
7.3
通讯作者:
Zhu Y
Zhu Y
中科院分区:
医学2区
文献类型:
--
作者:
Deng F;Xu G;Cheng Z;Huang Y;Ma C;Luo C;Yu C;Wang J;Xu X;Liu S;Zhu Y

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慢性B型肝炎是世界范围内的主要健康问题,有超过2.5亿慢性携带者。B型肝炎病毒干扰宿主先天免疫系统,从而通过几乎所有的组成蛋白逃避清除;然而,HBsAg在免疫逃避方面的功能仍不清楚。本研究旨在确定HBsAg在协助HBV逃避免疫应答中的作用。我们发现,HBsAg抑制核因子κ B(NF-κ B)通路的激活,导致先天免疫应答下调。HBsAg与TAK 1和TAB 2特异性相互作用,抑制TAK 1的磷酸化和多聚泛素化以及TAB 2的K63连接的多聚泛素化。自噬是一种主要的分解代谢过程,参与许多细胞过程,包括HBV的生命周期。我们发现HBsAg通过与TEK 1和TAB 2形成复合物来促进TEK 1和TAB 2的自噬降解,从而抑制NF-κB途径。TAK 1、TAB 2表达及NF-κB易位与临床肝组织HBsAg水平呈负相关。综上所述,我们的研究结果提示了一种新的机制,即HBsAg与TAK 1-TAB 2复合物相互作用,通过减少翻译后修饰和自噬降解抑制NF-κB信号通路的激活。
Chronic hepatitis B is a major health problem worldwide, with more than 250 million chronic carriers. Hepatitis B virus interferes with the host innate immune system so as to evade elimination via almost all of its constituent proteins; nevertheless, the function of HBsAg with respect to immune escape remains unclear. This study aimed to determine the role HBsAg plays in assisting HBV to escape from immune responses. We found that HBsAg suppressed the activation of the nuclear factor kappa B (NF-кB) pathway, leading to downregulation of innate immune responses. HBsAg interacted with TAK1 and TAB2 specifically, inhibiting the phosphorylation and polyubiquitination of TAK1 and the K63-linked polyubiquitination of TAB2. Autophagy is a major catabolic process participating in many cellular processes, including the life cycle of HBV. We found that HBsAg promoted the autophagic degradation of TAK1 and TAB2 via the formation of complexes with TAK1 and TAB2, resulting in suppression of the NF-κB pathway. The expression of TAK1, TAB2, and the translocation of NF-κB inversely correlated with HBsAg levels in clinical liver tissues. Taken together, our findings suggest a novel mechanism by which HBsAg interacts with TAK1-TAB2 complex and suppresses the activation of NF-κB signaling pathway via reduction of the post-translational modifications and autophagic degradation.
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