title: Fluid transport across cultured layers of corneal endothelium from aquaporin-1 null mice.
abstract: We explored the role of AQP1, the only known aquaporin in corneal endothelium, on active fluid transport and passive osmotic water movements across corneal endothelial layers cultured from AQP1 null mice and wildtype mice. AQP1 null mice had grossly transparent corneas, just as wildtype mice. Endothelial cell layers grown on permeable supports transported fluid at rates of (in microl h(-1) cm(-2), n = 9 mean+/-s.e.): 4.3+/-0.6, wildtype mice (MCE); 3.5+/-0.6, AQP1 null mice (KMCE; difference not significant). The osmotic water flow (also in microl h(-1) cm(-2)) induced by a 100 mOsm sucrose gradient across MCE cell layers (8.7+/-0.6, n = 8) was significantly greater than that across KMCE (5.7+/-0.7, n = 6, p = 0.007). When plated on glass coverslips, plasma membrane osmotic water permeability determined by light scattering was significantly higher for cells from wildtype vs. AQP1 null mice (in microm sec(-1): 74+/-4, n = 19 vs. 44+/-4 microm sec(-1), n = 11, p < 0.001). Unexpectedly, after 10% hypo-osmotic challenge, the extent of the regulatory volume recovery was significantly reduced for AQP1 null mice cells (in%: MCE controls, 99+/-1, n = 19 vs. KMCE: 64+/-5, n = 11, p < 0.001). Thus, as in other 'low rate' fluid transporting epithelia, deletion of AQP1 in mice corneal endothelium reduces osmotic water permeability but not active transendothelial fluid transport. However, that deletion impaired the extent of regulatory volume decrease after a hypo-osmotic challenge, suggesting a novel role for AQP1 in corneal endothelium.
authors.affiliation: Department of Ophthalmology, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, NY 10032, USA.
authors.forename: Kunyan
authors.initials: K
authors.lastname: Kuang
authors.forename: Maimaiti
authors.initials: M
authors.lastname: Yiming
authors.forename: Quan
authors.initials: Q
authors.lastname: Wen
authors.forename: Yansui
authors.initials: Y
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Ma
authors.forename: Pavel
authors.initials: P
authors.lastname: Iserovich
authors.forename: A S
authors.initials: AS
authors.lastname: Verkman
authors.forename: Jorge
authors.initials: J
authors.lastname: Fischbarg
mesh_terms: D000818:Animals; D051398:Aquaporin 1; D020346:Aquaporins / Q000235:genetics / Q000502:physiology*; D002462:Cell Membrane / Q000378:metabolism; D048429:Cell Size; D042783:Endothelial Cells / Q000378:metabolism*; D004728:Endothelium, Corneal / Q000378:metabolism*; D007150:Immunohistochemistry / Q000379:methods; D051379:Mice; D018345:Mice, Knockout; D014882:Water-Electrolyte Balance / Q000502:physiology*
chemical_list: C496021:Aqp1 protein, mouse; D020346:Aquaporins; D051398:Aquaporin 1