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2019 ; 32
(4
): 161-169
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Targeting Peroxisome Proliferator-Activated Receptor-Gamma Decreases Host
Mortality After Influenza Infection in Obese Mice
#MMPMID31009317
Huang S
; Jiang L
; Cheon IS
; Sun J
Viral Immunol
2019[May]; 32
(4
): 161-169
PMID31009317
show ga
Obesity is an independent risk factor for severe influenza infection. However,
the underlying cellular and molecular mechanisms are still incompletely
understood. In this study, we have utilized a murine influenza infection model in
genetic-induced obese (db/db) mice to explore the mechanisms by which obesity
increases host susceptibility to influenza infection. We find that db/db mice
have enhanced viral replication, exaggerated inflammatory responses, and
dysregulated lung repair process after influenza infection, and consequently
increased host mortality. Furthermore, we demonstrate that the transcription
factor peroxisome proliferator-activated receptor-gamma (PPAR-?), an important
inflammation regulator, was downregulated in the lung macrophages of db/db mice
after influenza infection. Strikingly, the treatment of 15-deoxy-?12,
14-prostaglandin J2 (15d-PGJ2), a PPAR-? agonist, largely rescued the survival of
db/db mice after influenza infection. Interestingly, macrophage PPAR-?-deficient
mice exhibited enhanced mortality after influenza infection and 15d-PGJ2 fails to
rescue host mortality in macrophage PPAR-?-deficient mice, suggesting that PPAR-?
expression in macrophages is critical for the action of 15d-PGJ2. These data
indicate that obesity attenuates lung antiviral immunity and hampers host
recovery through the modulation of macrophage PPAR-? expression. Furthermore,
modalities targeting macrophage PPAR-? expression and/or function may serve as
promising therapeutics to treat severe influenza infection in obese patients.