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2014 ; 9
(9
): e108138
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Impaired clearance of influenza A virus in obese, leptin receptor deficient mice
is independent of leptin signaling in the lung epithelium and macrophages
#MMPMID25232724
Radigan KA
; Morales-Nebreda L
; Soberanes S
; Nicholson T
; Nigdelioglu R
; Cho T
; Chi M
; Hamanaka RB
; Misharin AV
; Perlman H
; Budinger GR
; Mutlu GM
PLoS One
2014[]; 9
(9
): e108138
PMID25232724
show ga
RATIONALE: During the recent H1N1 outbreak, obese patients had worsened lung
injury and increased mortality. We used a murine model of influenza A pneumonia
to test the hypothesis that leptin receptor deficiency might explain the enhanced
mortality in obese patients. METHODS: We infected wild-type, obese mice globally
deficient in the leptin receptor (db/db) and non-obese mice with tissue specific
deletion of the leptin receptor in the lung epithelium (SPC-Cre/LepR fl/fl) or
macrophages and alveolar type II cells (LysM-Cre/Lepr fl/fl) with influenza A
virus (A/WSN/33 [H1N1]) (500 and 1500 pfu/mouse) and measured mortality, viral
clearance and several markers of lung injury severity. RESULTS: The clearance of
influenza A virus from the lungs of mice was impaired in obese mice globally
deficient in the leptin receptor (db/db) compared to normal weight wild-type
mice. In contrast, non-obese, SP-C-Cre+/+/LepR fl/fl and LysM-Cre+/+/LepR fl/fl
had improved viral clearance after influenza A infection. In obese mice,
mortality was increased compared with wild-type mice, while the SP-C-Cre+/+/LepR
fl/fl and LysM-Cre+/+/LepR fl/fl mice exhibited improved survival. CONCLUSIONS:
Global loss of the leptin receptor results in reduced viral clearance and worse
outcomes following influenza A infection. These findings are not the result of
the loss of leptin signaling in lung epithelial cells or macrophages. Our results
suggest that factors associated with obesity or with leptin signaling in
non-myeloid populations such as natural killer and T cells may be associated with
worsened outcomes following influenza A infection.