MicroRNA 876-5p modulates EV-A71 replication through downregulation of host antiviral factors

Virology Journal

Hwa Xu¹  Robert Y. L. Wang²  Han-Hsiang Chan³  Hsu Sheng Cheng³  Peng Xu⁴ 

[1] College of Resources and Environment Qingdao Agricultural Unviersity;Department of Biomedical Sciences, College of Medicine, Chang Gung University;Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University;Xiangyang No.1 People’s Hospital and Hubei University of Medicine;

关键词: Enterovirus A71;    microRNA-876-5p;    CREB5;    Antiviral protein;   

DOI  :  10.1186/s12985-020-1284-8

来源: DOAJ

【 摘 要 】

Abstract Background Human enterovirus 71 (EV-A71) is a non-enveloped virus that has a single stranded positive sense RNA genome. In a previous study, we showed that miR-876-5p upregulation was observed in the serum of patients with severe EV-A71 infection. Micro-876-5p (miR-876-5p) is a circulating miRNA that can be identified to modulate EV-A71 infections through both in vitro and in vivo studies. However, the regulatory mechanisms that involve miR-876-5p in the EV-A71 infection cycle remain unclear. Methods We demonstrated that miR-876-5p facilitated EV-A71 replication and expression by overexpression and knocking-down of miR-876-5p through the transfection of miR-876-5p plasmid and miR-876-5p inhibitor. Although miR-876-5p suppressed CREB5 expression, luciferase reporter assay confirmed this. We also evaluated the role of miR-876-5p in the EV-A71 infection cycle by CREB5 mediated by transfection with an anti-miR-876-5P inhibitor or in combination with an si-CREB5 plasmid. Results MicroR-876-5p was upregulated in EV-A71-infected neuroblastoma cells. Overexpression of miR-876-5p or knockdown of cyclic-AMP responsive element binding protein 5 (CREB5) promoted EV-A71 replication. The downregulation of miR-876-5p inhibited the accumulation of viral RNA and the production of viral proteins. Interestingly, CREB5 overexpression also suppressed EV-A71 replication. Our in vitro studies reveal that miR-876-5p directly targets CREB5. Finally, downregulation of CREB5 protein abated the inhibitory effect of anti-miR-876-5p and induced inhibitory effect of EV-A71 replication. Conclusions Our results suggest that intracellular miR-876-5p promotes EV-A71 replication indirectly by targeting the host CREB5 protein.

【 授权许可】

Unknown