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2019 ; 11
(4
): 316-329
Nephropedia Template TP
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Bacterial Outer Membrane Vesicles Provide Broad-Spectrum Protection against
Influenza Virus Infection via Recruitment and Activation of Macrophages
#MMPMID30844806
Bae EH
; Seo SH
; Kim CU
; Jang MS
; Song MS
; Lee TY
; Jeong YJ
; Lee MS
; Park JH
; Lee P
; Kim YS
; Kim SH
; Kim DJ
J Innate Immun
2019[]; 11
(4
): 316-329
PMID30844806
show ga
Influenza A virus (IAV) poses a constant worldwide threat to human health.
Although conventional vaccines are available, their protective efficacy is type
or strain specific, and their production is time-consuming. For the control of an
influenza pandemic in particular, agents that are immediately effective against a
wide range of virus variants should be developed. Although pretreatment of
various Toll-like receptor (TLR) ligands have already been reported to be
effective in the defense against subsequent IAV infection, the efficacy was
limited to specific subtypes, and safety concerns were also raised. In this
study, we investigated the protective effect of an attenuated bacterial outer
membrane vesicle -harboring modified lipid A moiety of lipopolysaccharide (fmOMV)
against IAV infection and the underlying mechanisms. Administration of fmOMV
conferred significant protection against a lethal dose of pandemic H1N1, PR8,
H5N2, and highly pathogenic H5N1 viruses; this broad antiviral activity was
dependent on macrophages but independent of neutrophils. fmOMV induced
recruitment and activation of macrophages and elicited type I IFNs. Intriguingly,
fmOMV showed a more significant protective effect than other TLR ligands tested
in previous reports, without exhibiting any adverse effect. These results show
the potential of fmOMV as a prophylactic agent for the defense against influenza
virus infection.