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2014 ; 10
(4
): e1004053
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gab.com Text
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English Wikipedia
Alveolar macrophages are essential for protection from respiratory failure and
associated morbidity following influenza virus infection
#MMPMID24699679
Schneider C
; Nobs SP
; Heer AK
; Kurrer M
; Klinke G
; van Rooijen N
; Vogel J
; Kopf M
PLoS Pathog
2014[Apr]; 10
(4
): e1004053
PMID24699679
show ga
Alveolar macrophages (AM) are critical for defense against bacterial and fungal
infections. However, a definitive role of AM in viral infections remains unclear.
We here report that AM play a key role in survival to influenza and vaccinia
virus infection by maintaining lung function and thereby protecting from
asphyxiation. Absence of AM in GM-CSF-deficient (Csf2-/-) mice or selective AM
depletion in wild-type mice resulted in impaired gas exchange and fatal hypoxia
associated with severe morbidity to influenza virus infection, while viral
clearance was affected moderately. Virus-induced morbidity was far more severe in
Csf2-/- mice lacking AM, as compared to Batf3-deficient mice lacking CD8?+ and
CD103+ DCs. Csf2-/- mice showed intact anti-viral CD8+ T cell responses despite
slightly impaired CD103+ DC development. Importantly, selective reconstitution of
AM development in Csf2rb-/- mice by neonatal transfer of wild-type AM progenitors
prevented severe morbidity and mortality, demonstrating that absence of AM alone
is responsible for disease severity in mice lacking GM-CSF or its receptor. In
addition, CD11c-Cre/Ppargfl/fl mice with a defect in AM but normal adaptive
immunity showed increased morbidity and lung failure to influenza virus. Taken
together, our results suggest a superior role of AM compared to CD103+ DCs in
protection from acute influenza and vaccinia virus infection-induced morbidity
and mortality.