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2019 ; 93
(9
): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
PPAR-? in Macrophages Limits Pulmonary Inflammation and Promotes Host Recovery
following Respiratory Viral Infection
#MMPMID30787149
Huang S
; Zhu B
; Cheon IS
; Goplen NP
; Jiang L
; Zhang R
; Peebles RS
; Mack M
; Kaplan MH
; Limper AH
; Sun J
J Virol
2019[May]; 93
(9
): ä PMID30787149
show ga
Alveolar macrophages (AM) play pivotal roles in modulating host defense,
pulmonary inflammation, and tissue injury following respiratory viral infections.
However, the transcriptional regulation of AM function during respiratory viral
infections is still largely undefined. Here we have screened the expression of 84
transcription factors in AM in response to influenza A virus (IAV) infection. We
found that the transcription factor PPAR-? was downregulated following IAV
infection in AM through type I interferon (IFN)-dependent signaling. PPAR-?
expression in AM was critical for the suppression of exaggerated antiviral and
inflammatory responses of AM following IAV and respiratory syncytial virus (RSV)
infections. Myeloid PPAR-? deficiency resulted in enhanced host morbidity and
increased pulmonary inflammation following both IAV and RSV infections,
suggesting that macrophage PPAR-? is vital for restricting severe host disease
development. Using approaches to selectively deplete recruiting monocytes, we
demonstrate that PPAR-? expression in resident AM is likely important in
regulating host disease development. Furthermore, we show that PPAR-? was
critical for the expression of wound healing genes in AM. As such, myeloid PPAR-?
deficiency resulted in impaired inflammation resolution and defective tissue
repair following IAV infection. Our data suggest a critical role of PPAR-?
expression in lung macrophages in the modulation of pulmonary inflammation, the
development of acute host diseases, and the proper restoration of tissue
homeostasis following respiratory viral infections.IMPORTANCE Respiratory viral
infections, like IAV and respiratory syncytial virus (RSV) infections, impose
great challenges to public health. Alveolar macrophages (AM) are lung-resident
immune cells that play important roles in protecting the host against IAV and RSV
infections. However, the underlying molecular mechanisms by which AM modulate
host inflammation, disease development, and tissue recovery are not very well
understood. Here we identify that PPAR-? expression in AM is crucial to suppress
pulmonary inflammation and diseases and to promote fast host recovery from IAV
and RSV infections. Our data suggest that targeting macrophage PPAR-? may be a
promising therapeutic option in the future to suppress acute inflammation and
simultaneously promote recovery from severe diseases associated with respiratory
viral infections.