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Evidence for the Presence of an Electrogenic Proton Pump on the Trout Gill Epithelium
1 Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, Canada V6T 2A9
Ion transport inhibitors, amiloride, SITS, vanadate and acetazolamide, wereadded to the water to determine the effect of ion transfer mechanisms on the acidification of water passing over the gills. In neutral water, proton excretion causes a marked reduction in gill water pH. If water pH is 2.5 units lower than blood pH, however, then this proton excretion is inhibited and all water pH changes can be accounted for by CO2 hydration and ammonia protonation. Proton excretion across the gills is insensitive to 0.1mmoll-1 amiloride and SITS but sensitive to vanadate, acetazolamide and water pH; thus, we conclude that proton excretion is mediated by an active proton pump on the apical membrane of the gill epithelium similar to that reported for the frog skin. Higher concentrations of amiloride (0.5 and 1mmoll-1) reduced both ammonia and acid excretion, presumably because of inhibition of Na+/K+-ATPase on the basolateral border ofthe gill epithelium.
Key words: acidification, carbon dioxide, ammonia, H+-ATPase, SITS, amiloride, vanadate, acetazolamide, gill, rainbow trout, Oncorhynchus mykiss
Accepted on July 5, 1991
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