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2015 ; 10
(4
): e0124047
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Induction of microglia activation after infection with the non-neurotropic
A/CA/04/2009 H1N1 influenza virus
#MMPMID25861024
Sadasivan S
; Zanin M
; O'Brien K
; Schultz-Cherry S
; Smeyne RJ
PLoS One
2015[]; 10
(4
): e0124047
PMID25861024
show ga
Although influenza is primarily a respiratory disease, it has been shown, in some
cases, to induce encephalitis, including people acutely infected with the
pandemic A/California/04/2009 (CA/09) H1N1 virus. Based on previous studies
showing that the highly pathogenic avian influenza (HPAI) A/Vietnam/1203/2004
H5N1 virus was neurotropic, induced CNS inflammation and a transient
parkinsonism, we examined the neurotropic and inflammatory potential of the CA/09
H1N1 virus in mice. Following intranasal inoculation, we found no evidence for
CA/09 H1N1 virus neurotropism in the enteric, peripheral or central nervous
systems. We did, however, observe a robust increase in microglial activity in the
brain characterized by an increase in the number of activated Iba-1-positive
microglia in the substantia nigra (SN) and the hippocampus, despite the absence
of virus in the brain. qPCR analysis in SN tissue showed that the induction of
microgliosis was preceded by reduced gene expression of the neurotrophic factors
bdnf, and gdnf and increases in the immune modulatory chemokine chemokine (C-C
motif) ligand 4 (ccl4). We also noted changes in the expression of transforming
growth factor-1 (tgf?1) in the SN starting at 7 days post-infection (dpi) that
was sustained through 21 dpi, coupled with increases in arginase-1 (arg1) and
csf1, M2 markers for microglia. Given that neuroinflammation contributes to
generation and progression of a number of neurodegenerative disorders, these
findings have significant implications as they highlight the possibility that
influenza and perhaps other non-neurotropic viruses can initiate inflammatory
signals via microglia activation in the brain and contribute to, but not
necessarily be the primary cause of, neurodegenerative disorders.
|Animals
[MESH]
|Arginase/genetics
[MESH]
|Blood-Brain Barrier
[MESH]
|Chemokines/metabolism
[MESH]
|Dentate Gyrus/pathology/virology
[MESH]
|Encephalitis/etiology/pathology/virology
[MESH]
|Female
[MESH]
|Gene Expression
[MESH]
|Influenza A Virus, H1N1 Subtype/classification/*pathogenicity
[MESH]