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2018 ; 28
(2
): 157-171
Nephropedia Template TP
gab.com Text
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English Wikipedia
H5N1 influenza virus-specific miRNA-like small RNA increases cytokine production
and mouse mortality via targeting poly(rC)-binding protein 2
#MMPMID29327729
Li X
; Fu Z
; Liang H
; Wang Y
; Qi X
; Ding M
; Sun X
; Zhou Z
; Huang Y
; Gu H
; Li L
; Chen X
; Li D
; Zhao Q
; Liu F
; Wang H
; Wang J
; Zen K
; Zhang CY
Cell Res
2018[Feb]; 28
(2
): 157-171
PMID29327729
show ga
Infection of H5N1 influenza virus causes the highest mortality among all
influenza viruses. The mechanisms underlying such high viral pathogenicity are
incompletely understood. Here, we report that the H5N1 influenza virus encodes a
microRNA-like small RNA, miR-HA-3p, which is processed from a stem
loop-containing viral RNA precursor by Argonaute 2, and plays a role in enhancing
cytokine production during H5N1 infection. Mechanistic study shows that miR-HA-3p
targets poly(rC)-binding protein 2 (PCBP2) and suppresses its expression.
Consistent with PCBP2 being an important negative regulator of
RIG-I/MAVS-mediated antiviral innate immunity, suppression of PCBP2 expression by
miR-HA-3p promotes cytokine production in human macrophages and mice infected
with H5N1 virus. We conclude that miR-HA-3p is the first identified influenza
virus-encoded microRNA-like functional RNA fragment and a novel virulence factor
contributing to H5N1-induced 'cytokine storm' and mortality.