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2015 ; 12
(ä): 61
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The effects of H3N2 swine influenza virus infection on TLRs and RLRs signaling
pathways in porcine alveolar macrophages
#MMPMID26021751
Zhang J
; Miao J
; Hou J
; Lu C
Virol J
2015[Apr]; 12
(ä): 61
PMID26021751
show ga
BACKGROUND: Swine influenza is an economically important respiratory disease of
swine resulting from infection with influenza A virus. Swine influenza virus
(SIV) becomes the focus as pigs have been hypothesized to serve as an
intermediate host for the adaptation of avian influenza viruses to humans or as
mixing vessels for the generation of genetically reassortant viruses. The ability
of the innate immune system to detect and respond to pathogens is important for
survival. Therefore, there is a critical need to evaluate the immediate response
to viral infection, especially the role of the toll-like receptors (TLRs) and RNA
helicase RIG-I-like receptors (RLRs) innate immunity signaling pathways in H3N2
swine influenza virus infection. METHOD: In this study, porcine alveolar
macrophages (PAMs) were obtained from porcine lungs and were infected with SIV at
a multiplicity of infection (MOI) of 5 in vitro. The changes of the related
receptors, signaling proteins and effector molecules of TLRs and RLRs signaling
pathways post H3N2 virus infection of PAMs were quantified by Real-time
quantitative RT-PCR and western blotting. RESULTS: The results showed that H3N2
SIV infection significantly increased mRNA expression of TLR-3, TLR-7, RIG- I and
MDA5 after 4 hpi (P?0.05). Western blotting showed that the protein levels of
TLR-3, TLR-7 and RIG-I also had a significantly increase after PAM exposed to
virus. A significant change of MyD88, MAVS, IRF-3 and IRF-7 mRNA expression were
present at 8 hpi. More than a 4-fold increase was induced for TNF-? and IL-1?
mRNA expression. And the concentration of TNF-? and IL-1? peaked at 12 and 24
hpi, respectively. IFN-?, IFN-? mRNA and protein levels increased after SIV
infection and significant differences was observed at 8, 12 and 24 hpi.
CONCLUSION: These results indicate that H3N2 swine influenza virus infection
significantly influences the expression of the receptors, adapter proteins and
downstream effector molecules of RLRs and TLRs signaling pathways. This study
enhances our understanding of innate immunity signaling pathways in PAM
anti-infection of H3N2 SIV.
|*Signal Transduction
[MESH]
|Animals
[MESH]
|Cell Line
[MESH]
|Cytokines/metabolism
[MESH]
|Gene Expression
[MESH]
|Influenza A Virus, H3N2 Subtype/*physiology
[MESH]