SIV replication is directly downregulated by four antiviral miRNAs

Retrovirology

Janice E Clements¹  Patrick M Tarwater²  Kenneth W Witwer³  Jeanne M Sisk³ 

[1]Department of Pathology, Edward D. Miller Research Building, The Johns Hopkins University School of Medicine, 733 N Broadway, Baltimore, MD 21205, USA

[2]Division of Biostatistics & Epidemiology, Texas Tech University Health Science Center, El Paso, TX, USA

[3]Department of Molecular and Comparative Pathobiology, Edward D. Miller Research Building, The Johns Hopkins University School of Medicine, 733 N Broadway, Baltimore, MD 21205, USA

关键词: Macrophages;    SIV;    HIV;    TNFa;    IFNb;    MiR-146a;    MiR-9;    MiR-29b;    MiR-29a;    MicroRNA;   

Others  :  807301
DOI  :  10.1186/1742-4690-10-95

 received in 2013-04-29, accepted in 2013-08-21,  发布年份 2013

【 摘 要 】

Background

Host cell microRNAs (miRNAs) have been shown to regulate the expression of both cellular and viral RNAs, in particular impacting both Hepatitis C Virus (HCV) and Human Immunodeficiency Virus (HIV). To investigate the role of miRNAs in regulating replication of the simian immunodeficiency virus (SIV) in macrophage lineage cells, we used primary macrophages to study targeting of SIV RNA by miRNAs. We examined whether specific host miRNAs directly target SIV RNA early in infection and might be induced via type I interferon pathways.

Results

miRNA target prediction programs identified miRNA binding sites within SIV RNA. Predicted binding sites for miRs-29a, -29b, -9 and -146a were identified in the SIV Nef/U3 and R regions, and all four miRNAs decreased virus production and viral RNA expression in primary macrophages. To determine whether levels of these miRNAs were affected by SIV infection, IFNβ or TNFα treatments, miRNA RT-qPCR assays measured miRNA levels after infection or treatment of macrophages. SIV RNA levels as well as virus production was downregulated by direct targeting of the SIV Nef/U3 and R regions by four miRNAs. miRs-29a, -29b, -9 and -146a were induced in primary macrophages after SIV infection. Each of these miRNAs was regulated by innate immune signaling through TNFα and/or the type I IFN, IFNβ.

Conclusions

The effects on miRNAs caused by HIV/SIV infection are illustrated by changes in their cellular expression throughout the course of disease, and in different patient populations. Our data demonstrate that levels of primary transcripts and mature miRs-29a, -29b, -9 and -146a are modulated by SIV infection. We show that the SIV 3′ UTR contains functional miRNA response elements (MREs) for all four miRNAs. Notably, these miRNAs regulate virus production and viral RNA levels in macrophages, the primary cells infected in the CNS that drive inflammation leading to HIV-associated neurocognitive disorders. This report may aid in identification miRNAs that target viral RNAs and HIV/SIV specifically, as well as in identification of miRNAs that may be targets of new therapies to treat HIV.

【 授权许可】

   
2013 Sisk et al.; licensee BioMed Central Ltd.

【 图 表 】

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