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Journal of Applied Physiology, Vol 60, Issue 1 289-294, Copyright © 1986 by American Physiological Society
ARTICLES |
E. D. Crandall, T. A. Heming, R. L. Palombo and B. E. Goodman
We have previously presented evidence that cultured alveolar epithelial cell monolayers actively transport sodium from medium to substratum, and that this process can be stimulated by beta-agonists. In this study the isolated perfused rat lung was utilized to investigate sodium transport across intact mammalian alveolar epithelium. Radioisotopic tracer(s) (22Na and/or [14C]sucrose) were instilled into the airways of isolated Ringer-perfused rat lungs. The appearance of isotope(s) in the recirculated perfusate was measured and a permeability-surface area product was calculated. Pharmacological agent(s) (terbutaline and/or propranolol) were present in the instillate or were added to the perfusate during the experiments. Terbutaline alone, whether in the instillate or perfusate, caused a significant increase in 22Na flux. This increase was prevented by the presence of propranolol. [14C]sucrose fluxes were unaffected by the presence of terbutaline. These data are consistent with the presence of an active component of sodium transport across intact mammalian alveolar epithelium that leads to removal of sodium from the alveolar space.
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