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2013 ; 17
(6
): R301
Nephropedia Template TP
gab.com Text
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English Wikipedia
Inhibition of the inflammatory cytokine tumor necrosis factor-alpha with
etanercept provides protection against lethal H1N1 influenza infection in mice
#MMPMID24373231
Shi X
; Zhou W
; Huang H
; Zhu H
; Zhou P
; Zhu H
; Ju D
Crit Care
2013[Dec]; 17
(6
): R301
PMID24373231
show ga
INTRODUCTION: Factors implicated in influenza-mediated morbidity and mortality
include robust cytokine production (cytokine storm), excessive inflammatory
infiltrates, and virus-induced tissue destruction. Tumor necrosis factor-alpha
(TNF-?) is an important pro-inflammatory cytokine present during influenza
infection, but it is unclear whether direct inhibition of TNF-? can elicit
protection against influenza infection. METHODS: In this study, the commercially
available TNF-? inhibitor etanercept was used to inhibit TNF-? induced by lethal
A/FM/1/47 (H1N1) influenza virus infection of mice. The effects of TNF-?
inhibition on mouse survival, pathologic changes, immune cell infiltration,
inflammatory cytokine secretion, Toll-like receptor expression, and activation of
the NF-?B (nuclear factor kappa B) signaling pathway were evaluated. RESULTS: The
intranasal delivery of etanercept provided significant protection against
mortality (30% of mice survived up to 14 days after infection) in mice treated
with etanercept. In contrast, no survivors were found beyond 6 days in mice
treated with saline after lethal challenge with H1N1 influenza virus. It was
observed that etanercept significantly reduced inflammatory cell infiltration
(for example, macrophages and neutrophils), inflammatory cytokine secretion (for
example, interleukin-6, TNF-?, and interferon gamma), and expression of Toll-like
receptors (TLR-3, TLR-4, and TLR-7). Etanercept also downregulated and inhibited
the cascade proteins of the NF-?B signaling pathway (for example, MyD88, TRIF,
NF-?B, and p65), as well as enhanced host control of virus replication.
CONCLUSIONS: These findings indicate that etanercept, by blocking TNF-?, can
significantly downregulate excessive inflammatory immune responses and provide
protection against lethal influenza infection, making its use a novel strategy
for controlling severe influenza-induced viral pneumonia.