title: HBsAg blocks TYPE I IFN induced up-regulation of A3G through inhibition of STAT3.
abstract: Interferon (IFN) is a regularly utilized therapeutic for the treatment of chronic hepatitis B and appears to induce superior HBeAg seroconversion comparing nucleos/tide analogs. However, the mechanisms underlying IFN inhibition of HBV replication, as well as poor responses to IFN are unclear. Apobec3G has been reported to be involved in regulating HBV replication. In this study, we investigated Apobec3G expression and regulatory pathways during HBV infection. We show that over-expression of A3G leads to inhibition of HBV replication. We also show that IFN induces a significant increase in A3G protein expression, which is associated with STAT3 activation. We further show that A3G expression in HBV patients is lower compared to non-infected controls, possibly by HBsAg which inhibits IFN induced A3G up-regulation in a dose dependent manner. This process is likely mediated through inhibition of STAT3-Ser727 phosphorylation. The results presented in this study indicate that STAT3 plays an important role in IFN-induced A3G production, and HBsAg may correlated with poor response to IFN treatment.
authors.affiliation: Institute of Translational Medicine, Department of Immunology, The First Hospital, Jilin University, Changchun, Jilin, 130061, PR China.
authors.forename: Fengchao
authors.initials: F
authors.lastname: Xu
authors.affiliation: Institute of Translational Medicine, Department of Immunology, The First Hospital, Jilin University, Changchun, Jilin, 130061, PR China.
authors.forename: Hongxiao
authors.initials: H
authors.lastname: Song
authors.affiliation: Department of Obstetric, The First Hospital, Jilin University, Changchun, Jilin, 130021, PR China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: Institute of Translational Medicine, Department of Immunology, The First Hospital, Jilin University, Changchun, Jilin, 130061, PR China. Electronic address: tgy0425@jlu.edu.cn.
authors.forename: Guangyun
authors.initials: G
authors.lastname: Tan
mesh_terms: D000071480:APOBEC-3G Deaminase; D000328:Adult; D064113:CRISPR-Cas Systems; D003564:Cytidine Deaminase / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D057809:HEK293 Cells; D056945:Hep G2 Cells; D006514:Hepatitis B Surface Antigens / Q000737:chemistry*; D019694:Hepatitis B, Chronic / Q000188:drug therapy / Q000378:metabolism; D006801:Humans; D015151:Immunoblotting; D007370:Interferon Type I / Q000037:antagonists & inhibitors / Q000737:chemistry*; D008297:Male; D008875:Middle Aged; D010766:Phosphorylation; D050796:STAT3 Transcription Factor / Q000037:antagonists & inhibitors / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: D006514:Hepatitis B Surface Antigens; D007370:Interferon Type I; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D000071480:APOBEC-3G Deaminase; C464924:APOBEC3G protein, human; D003564:Cytidine Deaminase
keywords: A3G; HBV; HBs; STAT3