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. 2000 Jan 1;115(1):17–27. doi: 10.1085/jgp.115.1.17

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© 2000 The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

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Characterization of airspace-capillary osmotic water transport. (A) Dependence of osmotically driven water transport on osmolyte size. The airspace compartment was filled with isosmolar HBS and the perfusate solutions switched between HBS and hyperosmolar HBS containing 300 mOsm NaCl, urea, glycine, or sucrose as indicated. Original gravimetric recordings are shown at the left and averaged water flow data at the right. (B) Temperature-dependence measurements were done as in A, using NaCl as osmolyte, in wild-type and AQP1 null mice. Original gravimetric recordings are shown at the left and an Arrhenius plot at the right. (C and D) Effect of pulmonary artery (PA) perfusion pressure and left atrial (LA) outflow pressure. Perfusate osmolalities were changed from 300 to 200 mOsm at indicated perfusion pressures. (E) Effect of AQP1 deletion on microvascular water permeability. The airspace was filled with an inert perfluorocarbon and the pulmonary artery perfused with solutions of indicated osmolalities. See text for explanations.