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Am. J. Respir. Cell Mol. Biol., Volume 22, Number 1, January, 2000 34-44

Decreased Expression of Aquaporin (AQP)1 and AQP5 in Mouse Lung after Acute Viral Infection

Jennifer E. Towne, Kevin S. Harrod, Carissa M. Krane, and Anil G. Menon

Department of Molecular Genetics, Biochemistry and Microbiology, College of Medicine, University of Cincinnati; and Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio

Intratracheal infection of mice with adenovirus is associated with subsequent pulmonary inflammation and edema. Water movement through the air space-capillary barrier in the distal lung is facilitated by aquaporins (AQPs). To investigate the possibility that distal lung AQPs undergo altered regulation under conditions of aberrant fluid handling in the lung, we analyzed messenger RNA (mRNA) and protein expression of AQPs 1 and 5 in the lungs of mice 7 and 14 d after infection with adenovirus. Here, we demonstrate that AQP1 and AQP5 show decreased expression following adenoviral infection. Northern blot analysis showed significantly decreased mRNA levels of AQP1, which is expressed in the capillary endothelium, and AQP5, which is expressed in alveolar epithelium, in the lungs of mice both 7 and 14 d after infection. Immunoblotting studies demonstrated significantly reduced levels of AQP1 and AQP5 protein after infection as well. In addition, mRNA expression of the alpha  subunit of the epithelial sodium channel was reduced in the lungs of mice 7 and 14 d after adenoviral infection. In contrast, mRNA expression of the alpha 1 subunit of the Na,K-adenosine triphosphatase in the lung was unaltered. Immunohistochemical analysis demonstrated that the decreases in AQP1 and AQP5 expression were not localized to regions of overt inflammation but were found throughout the lung. Thus, this study provides the first report of AQP gene regulation in an in vivo model of pulmonary inflammation and edema. Decreased AQP1 and AQP5 levels during adenoviral infection suggest a role for AQP1 and AQP5 in the abnormal fluid fluxes detected during pulmonary inflammation.




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