Ultrastructural observations on the aldosterone-stimulated toad urinary bladder epithelium—ATPase activity

Abstract

Ultrastructural evidence is presented indicating an increase in membrane-bound ATPase activity of the mucosal epithelium of the toad urinary bladder following exposure of its serosal surface to aldosterone. Although no conclusion could be made as to whether the observed increase in ATPase activity was a direct affect of AIP, or an event secondary to an effect of AIP on other components of the cells, various possibilities are discussed in terms of current physiological information regarding the effects of aldosterone on the epithelium of the isolated toad urinary bladder.