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2017 ; 13
(8
): e1006585
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gab.com Text
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HRS plays an important role for TLR7 signaling to orchestrate inflammation and
innate immunity upon EV71 infection
#MMPMID28854257
Luo Z
; Ge M
; Chen J
; Geng Q
; Tian M
; Qiao Z
; Bai L
; Zhang Q
; Zhu C
; Xiong Y
; Wu K
; Liu F
; Liu Y
; Wu J
PLoS Pathog
2017[Aug]; 13
(8
): e1006585
PMID28854257
show ga
Enterovirus 71 (EV71) is an RNA virus that causes hand-foot-mouth disease (HFMD),
and even fatal encephalitis in children. Although EV71 pathogenesis remains
largely obscure, host immune responses may play important roles in the
development of diseases. Recognition of pathogens mediated by Toll-like receptors
(TLRs) induces host immune and inflammatory responses. Intracellular TLRs must
traffic from the endoplasmic reticulum (ER) to the endolysosomal network from
where they initiate complete signaling, leading to inflammatory response. This
study reveals a novel mechanism underlying the regulation of TLR7 signaling
during EV71 infection. Initially, we show that multiple cytokines are
differentially expressed during viral infection and demonstrate that EV71
infection induces the production of proinflammatory cytokines through regulating
TLR7-mediated p38 MAPK, and NF-?B signaling pathways. Further studies reveal that
the expression of the endosome-associated protein hepatocyte growth
factor-regulated tyrosine kinase substrate (HRS) is upregulated and highly
correlated with the expression of TLR7 in EV71 infected patients, mice, and
cultured cells. Virus-induced HRS subsequently enhances TLR7 complex formation in
early- and late-endosome by interacting with TLR7 and TAB1. Moreover, HRS is
involved in the regulation of the TLR7/NF-?B/p38 MAPK and the TLR7/NF-?B/IRF3
signaling pathways to induce proinflammatory cytokines and interferons,
respectively, resulting in the orchestration of inflammatory and immune responses
to the EV71 infection. Therefore, this study demonstrates that HRS acts as a key
component of TLR7 signaling to orchestrate immune and inflammatory responses
during EV71 infection, and provides new insights into the mechanisms underlying
the regulation of host inflammation and innate immunity during EV71 infection.
|Animals
[MESH]
|Coxsackievirus Infections/*immunology
[MESH]
|Endosomal Sorting Complexes Required for Transport/*immunology/metabolism
[MESH]