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- Title
Vasopressin-induced redistribution of binding sites for concanavalin A at the surface of epithelial cells from urinary bladder.
- Authors
PIETRAS, RICHARD J.
- Abstract
VASOPRESSIN promotes water movement across the epithelium of the distal portion of mammalian renal tubule and amphibian urinary bladder1,2. The hormone also elicits a general, non-selective increase in the transcellular permeation of lipophilic solutes3 and a decrease in the discrimination between straight- and branched-chain isomers4,5. Such changes in the permeability of amphibian urinary bladder are limited to the apical membrane of those epithelial cells rich in intracellular secretion granules6,7. These granules, some of which may correspond to lysosomes8, are observed to migrate to the mucosal membrane of toad bladders treated with oxytocin or cyclic AMP9. Moreover, treatment with vasopressin provokes the extracellular release of acid hydrolases at the apical surface of cells from bullfrog bladder10. Additional evidence shows that repression of such hydrolase activity at the external surface reduces the hormone-induced water flow observed across the intact epithelium7. My present investigation extends these observations by providing direct evidence in epithelial cells from bullfrog bladder for vasopressin-induced rearrangement into clusters of binding sites for concanavalin A (con A) which are otherwise randomly disposed at the surface of control cells. This hormone effect is inhibited by prior incubation of cells with the microtubule-disrupting drug, colchicine. In addition, colchicine treatment antagonises the enhancement of extracellular hydrolase release and transepithelial water flow attributable to vasopressin action.
- Publication
Nature, 1976, Vol 264, Issue 5588, p774
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/264774a0