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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+Pathog
2013 ; 9
(2
): e1003188
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Macrophage-expressed IFN-? contributes to apoptotic alveolar epithelial cell
injury in severe influenza virus pneumonia
#MMPMID23468627
Högner K
; Wolff T
; Pleschka S
; Plog S
; Gruber AD
; Kalinke U
; Walmrath HD
; Bodner J
; Gattenlöhner S
; Lewe-Schlosser P
; Matrosovich M
; Seeger W
; Lohmeyer J
; Herold S
PLoS Pathog
2013[Feb]; 9
(2
): e1003188
PMID23468627
show ga
Influenza viruses (IV) cause pneumonia in humans with progression to lung failure
and fatal outcome. Dysregulated release of cytokines including type I interferons
(IFNs) has been attributed a crucial role in immune-mediated pulmonary injury
during severe IV infection. Using ex vivo and in vivo IV infection models, we
demonstrate that alveolar macrophage (AM)-expressed IFN-? significantly
contributes to IV-induced alveolar epithelial cell (AEC) injury by autocrine
induction of the pro-apoptotic factor TNF-related apoptosis-inducing ligand
(TRAIL). Of note, TRAIL was highly upregulated in and released from AM of
patients with pandemic H1N1 IV-induced acute lung injury. Elucidating the
cell-specific underlying signalling pathways revealed that IV infection induced
IFN-? release in AM in a protein kinase R- (PKR-) and NF-?B-dependent way. Bone
marrow chimeric mice lacking these signalling mediators in resident and
lung-recruited AM and mice subjected to alveolar neutralization of IFN-? and
TRAIL displayed reduced alveolar epithelial cell apoptosis and attenuated lung
injury during severe IV pneumonia. Together, we demonstrate that
macrophage-released type I IFNs, apart from their well-known anti-viral
properties, contribute to IV-induced AEC damage and lung injury by autocrine
induction of the pro-apoptotic factor TRAIL. Our data suggest that therapeutic
targeting of the macrophage IFN-?-TRAIL axis might represent a promising strategy
to attenuate IV-induced acute lung injury.