PMID- 33517839 OWN - NLM STAT- MEDLINE DCOM- 20210930 LR - 20210930 IS - 2150-5608 (Electronic) IS - 2150-5594 (Print) IS - 2150-5594 (Linking) VI - 12 IP - 1 DP - 2021 Dec TI - Sox4 represses host innate immunity to facilitate pathogen infection by hijacking the TLR signaling networks. PG - 704-722 LID - 10.1080/21505594.2021.1882775 [doi] AB - Toll-like receptors (TLRs) are essential for the protection of the host from pathogen infections by initiating the integration of contextual cues to regulate inflammation and immunity. However, without tightly controlled immune responses, the host will be subjected to detrimental outcomes. Therefore, it is important to balance the positive and negative regulations of TLRs to eliminate pathogen infection, yet avert harmful immunological consequences. This study revealed a distinct mechanism underlying the regulation of the TLR network. The expression of sex-determining region Y-box 4 (Sox4) is induced by virus infection in viral infected patients and cultured cells, which subsequently represses the TLR signaling network to facilitate viral replication at multiple levels by a distinct mechanism. Briefly, Sox4 inhibits the production of myeloid differentiation primary response gene 88 (MyD88) and most of the TLRs by binding to their promoters to attenuate gene transcription. In addition, Sox4 blocks the activities of the TLR/MyD88/IRAK4/TAK1 and TLR/TRIF/TRAF3/TBK1 pathways by repressing their key components. Moreover, Sox4 represses the activation of the nuclear factor kappa-B (NF-kappaB) through interacting with IKKalpha/alpha, and attenuates NF-kB and IFN regulatory factors 3/7 (IRF3/7) abundances by promoting protein degradation. All these contributed to the down-regulation of interferons (IFNs) and IFN-stimulated gene (ISG) expression, leading to facilitate the viral replications. Therefore, we reveal a distinct mechanism by which viral pathogens evade host innate immunity and discover a key regulator in host defense. FAU - Shang, Jian AU - Shang J AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Zheng, Yuan AU - Zheng Y AD - State Key Laboratory of Virology, College of Life Sciences, Wuhan University , Wuhan, China. FAU - Mo, Jiayin AU - Mo J AD - State Key Laboratory of Virology, College of Life Sciences, Wuhan University , Wuhan, China. FAU - Wang, Wenbiao AU - Wang W AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Luo, Zhen AU - Luo Z AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Li, Yongkui AU - Li Y AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Chen, Xulin AU - Chen X AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Zhang, Qiwei AU - Zhang Q AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Wu, Kailang AU - Wu K AD - State Key Laboratory of Virology, College of Life Sciences, Wuhan University , Wuhan, China. FAU - Liu, Weiyong AU - Liu W AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. FAU - Wu, Jianguo AU - Wu J AUID- ORCID: 0000-0002-8326-2895 AD - Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University , Guangzhou, China. AD - State Key Laboratory of Virology, College of Life Sciences, Wuhan University , Wuhan, China. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Virulence JT - Virulence JID - 101531386 RN - 0 (Myeloid Differentiation Factor 88) RN - 0 (SOX4 protein, human) RN - 0 (SOXC Transcription Factors) RN - 0 (Toll-Like Receptors) SB - IM MH - Enterovirus A, Human/immunology/pathogenicity MH - Hep G2 Cells MH - Humans MH - Immunity, Innate/*genetics/immunology MH - Influenza A virus/immunology/pathogenicity MH - Leukocytes, Mononuclear/immunology/virology MH - Myeloid Differentiation Factor 88/antagonists & inhibitors/immunology MH - SOXC Transcription Factors/*genetics/*immunology MH - Signal Transduction/genetics/*immunology MH - Toll-Like Receptors/genetics/immunology/*metabolism MH - Virus Replication MH - Viruses/*immunology/pathogenicity PMC - PMC7894441 OTO - NOTNLM OT - EV71 OT - Enterovirus 71 OT - HCV OT - IAV OT - IFN OT - IFN regulatory factors 3/7 OT - IFN-stimulated gene OT - IRF3/7 OT - ISG OT - MyD88 OT - SEV OT - Sox4 OT - TLRS OT - Toll-like receptors OT - VSV OT - hepatitis C virus OT - influenza A virus OT - interferon OT - myeloid differentiation primary response gene 88 OT - sendai virus OT - sex-determining region Y-box 4 OT - vesicular stomatitis virus EDAT- 2021/02/02 06:00 MHDA- 2021/10/01 06:00 PMCR- 2021/02/16 CRDT- 2021/02/01 05:29 PHST- 2021/02/02 06:00 [pubmed] PHST- 2021/10/01 06:00 [medline] PHST- 2021/02/01 05:29 [entrez] PHST- 2021/02/16 00:00 [pmc-release] AID - 1882775 [pii] AID - 10.1080/21505594.2021.1882775 [doi] PST - ppublish SO - Virulence. 2021 Dec;12(1):704-722. doi: 10.1080/21505594.2021.1882775.