Primate-specific miR-576-3p sets host defense signalling threshold

Melanie L. Yarbrough, Ke Zhang, Ramanavelan Sakthivel, Christian V. Forst, Bruce A. Posner, Glen N. Barber, Michael A. White and Beatriz M. A. Fontoura ()
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Melanie L. Yarbrough: University of Texas Southwestern Medical Center
Ke Zhang: University of Texas Southwestern Medical Center
Ramanavelan Sakthivel: University of Texas Southwestern Medical Center
Christian V. Forst: Institute for Genomics and Multiscale Biology, Mount Sinai School of Medicine
Bruce A. Posner: University of Texas Southwestern Medical Center
Glen N. Barber: University of Miami Miller School of Medicine
Michael A. White: University of Texas Southwestern Medical Center
Beatriz M. A. Fontoura: University of Texas Southwestern Medical Center

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract MicroRNAs (miRNAs) have been shown to regulate viral infection, but the miRNAs that target intracellular sensors and adaptors of innate immunity have not been fully uncovered. Here we conduct an miRNA mimic screen and validation with miRNA inhibitors in cells infected with vesicular stomatitis virus (VSV) to identify miRNAs that regulate viral–host interactions. We identify miR-576-3p as a robust regulator of infection by VSV and other RNA and DNA viruses. While an miR-576-3p mimic sensitizes cells to viral replication, inhibition of endogenous miR-576-3p prevents infection. miR-576-3p is induced by IRF3 concomitantly with interferon and targets STING, MAVS and TRAF3, which are critical factors for interferon expression. Interestingly, miR-576-3p and its binding sites are primate-specific and miR-576-3p levels are reduced in inflammatory diseases. These findings indicate that induction of miR-576-3p by IRF3 triggers a feedback mechanism to reduce interferon expression and set an antiviral response threshold to likely avoid excessive inflammation.

Date: 2014
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DOI: 10.1038/ncomms5963

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