LRRC25 Functions as an Inhibitor of NF-κB Signaling Pathway by Promoting p65/RelA for Autophagic Degradation.

LRRC25 Functions as an Inhibitor of NF-κB Signaling Pathway by Promoting p65/RelA for Autophagic Degradation.
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DOI:
10.1038/s41598-017-12573-3
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发表时间:
2017-10-18
期刊:
影响因子:
4.6
通讯作者:
Wang RF
Wang RF
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Feng Y;Duan T;Du Y;Jin S;Wang M;Cui J;Wang RF

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核因子 κB (NF-κB) 是一个关键转录因子家族,在先天免疫反应和炎症中发挥着关键作用,但其严格调节的分子机制尚不完全清楚。在这项研究中,我们确定了 LRRC25(富含亮氨酸重复序列 (LRR) 的蛋白家族成员)作为 NF-κB 信号通路的负调节因子。 LRRC25 的异位表达会损害 NF-κB 的激活,而 LRRC25 的敲除则会增强 NF-κB 的激活并增强炎症细胞因子的产生。进一步研究表明,LRRC25的LRR结构域与p65/RelA的Rel同源结构域(RHD)相互作用,促进p65/RelA的降解。此外,LRRC25增强了p65/RelA与货物受体p62之间的相互作用,从而促进p65/RelA通过自噬途径的降解。我们的研究不仅确定了LRRC25作为NF-κB信号通路的新型抑制剂,而且揭示了NF-κB信号通路与自噬通路之间串扰的新机制。
Nuclear factor κB (NF-κB) is a family of critical transcription factors that play a critical role in innate immune responses and inflammation, yet the molecular mechanisms responsible for its tight regulation is not fully understood. In this study, we identified LRRC25, a member of leucine-rich repeat (LRR)-containing protein family, as a negative regulator in the NF-κB signaling pathway. Ectopic expression of LRRC25 impaired NF-κB activation, whereas knockout of LRRC25 potentiated NF-κB activation and enhanced the production of inflammatory cytokines. Further study demonstrated that the LRR domain of LRRC25 interacted with the Rel Homology domain (RHD) of p65/RelA and promotes the degradation of p65/RelA. Furthermore, LRRC25 enhanced the interaction between p65/RelA and cargo receptor p62, thus facilitating the degradation of p65/RelA through autophagy pathway. Our study has not only identified LRRC25 as a novel inhibitor of NF-κB signaling pathway, but also uncovers a new mechanism of crosstalk between NF-κB signaling and autophagy pathways.
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