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In this study, we provide evidence that CAII is expressed in both type I (AECI) and type II (AECII) alveolar epithelial cells by RT-PCR and Western blotting in freshly isolated rat cells. These results were further confirmed by double immunostaining with CAII antibodies and AECI- or AECII-specific markers in freshly isolated alveolar epithelial cells and rat lung tissues. Inhibition of CAII by acetazolamide or methazolamide delayed the decrease in the intracellular pH observed during hypercapnia in cultured AECI, AECII, and AECI-like cells. In an isolated-perfused rat lung model, alveolar fluid reabsorption significantly decreased during high CO2 exposure, which was not prevented by carbonic anhydrase inhibition. Thus, we provide evidence that CAII is expressed in rat alveolar epithelial cells and does not regulate lung alveolar fluid reabsorption during hypercapnia.<\/jats:p>","DOI":"10.1165\/rcmb.2007-0121oc","type":"journal-article","created":{"date-parts":[[2007,8,9]],"date-time":"2007-08-09T20:59:02Z","timestamp":1186693142000},"page":"32-37","source":"Crossref","is-referenced-by-count":31,"title":["Carbonic Anhydrase II and Alveolar Fluid Reabsorption during Hypercapnia"],"prefix":"10.1093","volume":"38","author":[{"given":"Jiwang","family":"Chen","sequence":"first","affiliation":[{"name":"Division of Pulmonary and Critical Care Medicine, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emilia","family":"Lecuona","sequence":"additional","affiliation":[{"name":"Division of Pulmonary and Critical Care Medicine, Department of Medicine, Feinberg School of Medicine, Northwestern 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