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2013 ; 208
(5
): 780-9
Nephropedia Template TP
gab.com Text
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English Wikipedia
Heterozygosity for the F508del mutation in the cystic fibrosis transmembrane
conductance regulator anion channel attenuates influenza severity
#MMPMID23749967
Aeffner F
; Abdulrahman B
; Hickman-Davis JM
; Janssen PM
; Amer A
; Bedwell DM
; Sorscher EJ
; Davis IC
J Infect Dis
2013[Sep]; 208
(5
): 780-9
PMID23749967
show ga
BACKGROUND: Seasonal and pandemic influenza are significant public health
concerns. Influenza stimulates respiratory epithelial Cl(-) secretion via the
cystic fibrosis transmembrane conductance regulator (CFTR). The purpose of this
study was to determine the contribution of this effect to influenza pathogenesis
in mice with reduced CFTR activity. METHODS: C57BL/6-congenic mice heterozygous
for the F508del CFTR mutation (HET) and wild-type (WT) controls were infected
intranasally with 10 000 focus-forming units of influenza A/WSN/33 (H1N1) per
mouse. Body weight, arterial O2 saturation, and heart rate were monitored daily.
Pulmonary edema and lung function parameters were derived from ratios of wet
weight to dry weight and the forced-oscillation technique, respectively. Levels
of cytokines and chemokines in bronchoalveolar lavage fluid were measured by
enzyme-linked immunosorbent assay. RESULTS: Relative to WT mice, influenza
virus-infected HET mice showed significantly delayed mortality, which was
accompanied by attenuated hypoxemia, cardiopulmonary dysfunction, and pulmonary
edema. However, viral replication and weight loss did not differ. The protective
HET phenotype was correlated with exaggerated alveolar macrophage and interleukin
6 responses to infection and was abrogated by alveolar macrophage depletion,
using clodronate liposomes. CONCLUSIONS: Reduced CFTR expression modulates the
innate immune response to influenza and alters disease pathogenesis.
CFTR-mediated Cl(-) secretion is therefore an important host determinant of
disease, and CFTR inhibition may be of therapeutic benefit in influenza.