BmCH25H, a vertebrate interferon-stimulated gene(ISG) homolog, inhibits BmNPV infection dependent on its hydroxylase activity in Bombyx mori
文献类型： 外文期刊
作者： Wu, Hongyun 1 ; Xia, Junming 1 ; Fei, Shigang 1 ; Wang, Yeyuan 1 ; Zhang, Mengmeng 1 ; Guo, Yiyao 1 ; Li, Xian 1 ; Swevers, Luc 2 ; Sun, Jingchen 1 ; Feng, Min 1 ;
作者机构： 1.South China Agr Univ, Coll Anim Sci, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Guangzhou 510642, Peoples R China
2.Natl Ctr Sci Res Demokritos, Inst Biosci & Applicat, Insect Mol Genet & Biotechnol, Athens 15310, Greece
关键词： Bombyx mori nucleopolyhedrovirus; Bombyx mori; Cholesterol 25-hydroxylase; Interferon-stimulated genes; Signal transducer and activator of transcription
期刊名称：INSECT SCIENCE （ 影响因子：3.605； 五年影响因子：3.323 ）
ISSN： 1672-9609
年卷期：
页码：
收录情况： SCI
摘要： Cholesterol-25-hydroxylase (CH25H) has been identified as an interferon-stimulated gene (ISG) in mammals that exerts its antiviral effects by catalyzing the conversion of cholesterol to 25-hydroxycholesterol (25HC). However, invertebrates lack an antiviral system homologous to vertebrate interferons (IFNs) because the genomes of invertebrates do not encode IFN-like cytokines. Nevertheless, CH25H is present in insect genomes and it therefore deserves further study of whether and by which mechanism it could exert an antiviral effect in invertebrates. In this study, the Bombyx mori CH25H (BmCH25H) gene, of which the encoded protein has high homology with other lepidopteran species, was identified and located on chromosome 9. Interestingly, we found that the expression of BmCH25H was significantly upregulated in B. mori nucleopolyhedrovirus (BmNPV) -infected BmN cells and silkworm (B. mori) larvae at the early infection stage. The inhibitory effect of BmCH25H on BmNPV replication was further demonstrated to depend on its catalytic residues to convert cholesterol to 25HC. More importantly, we demonstrated that during BmNPV infection, BmCH25H expression was increased through the Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathway, similar to the induction of ISGs following virus infection in vertebrates. This is the first report that CH25H has antiviral effects in insects; the study also elucidates the regulation of its expression and its mechanism of action.
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