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2017 ; 13
(1
): e1006140
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Alveolar Macrophages Prevent Lethal Influenza Pneumonia By Inhibiting Infection
Of Type-1 Alveolar Epithelial Cells
#MMPMID28085958
Cardani A
; Boulton A
; Kim TS
; Braciale TJ
PLoS Pathog
2017[Jan]; 13
(1
): e1006140
PMID28085958
show ga
The Influenza A virus (IAV) is a major human pathogen that produces significant
morbidity and mortality. To explore the contribution of alveolar macrophages
(AlvM?s) in regulating the severity of IAV infection we employed a murine model
in which the Core Binding Factor Beta gene is conditionally disrupted in myeloid
cells. These mice exhibit a selective deficiency in AlvM?s. Following IAV
infection these AlvM? deficient mice developed severe diffuse alveolar damage,
lethal respiratory compromise, and consequent lethality. Lethal injury in these
mice resulted from increased infection of their Type-1 Alveolar Epithelial Cells
(T1AECs) and the subsequent elimination of the infected T1AECs by the adaptive
immune T cell response. Further analysis indicated AlvM?-mediated suppression of
the cysteinyl leukotriene (cysLT) pathway genes in T1AECs in vivo and in vitro.
Inhibition of the cysLT pathway enzymes in a T1AECs cell line reduced the
susceptibility of T1AECs to IAV infection, suggesting that AlvM?-mediated
suppression of this pathway contributes to the resistance of T1AECs to IAV
infection. Furthermore, inhibition of the cysLT pathway enzymes, as well as
blockade of the cysteinyl leukotriene receptors in the AlvM? deficient mice
reduced the susceptibility of their T1AECs to IAV infection and protected these
mice from lethal infection. These results suggest that AlvM?s may utilize a
previously unappreciated mechanism to protect T1AECs against IAV infection, and
thereby reduce the severity of infection. The findings further suggest that the
cysLT pathway and the receptors for cysLT metabolites represent potential
therapeutic targets in severe IAV infection.