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. 1974 Sep;241(2):407–422. doi: 10.1113/jphysiol.1974.sp010663

Calcium release in relation to permeability changes in toad bladder epithelium following antidiuretic hormone

A W Cuthbert, P Y D Wong
PMCID: PMC1331039  PMID: 4374522

Abstract

1. Methods for measuring the release of 45Ca from isolated urinary bladders of toads (Bufo marinus) pre-loaded with this isotope have been devised. One method allowed separate collection from the mucosal and serosal surfaces of the bladders.

2. Reducing the ambient calcium concentration reduced the rate of 45Ca efflux suggesting that efflux of radiolabel represents calcium exchange.

3. Antidiuretic hormone, theophylline and prostaglandin E1 all increased calcium efflux, while lanthanum and amphotericin were without effect. Cyclic AMP caused only an inhibition of calcium release.

4. The increase in 45Ca efflux due to antidiuretic hormone came exclusively from the mucosal side. Experiments with EGTA suggest that the calcium entering the mucosal solution arises mainly from superficial sites in the mucosal membrane.

5. The release of 45Ca by hormone was not influenced by removal of sodium from the bathing solution. Low pH and amiloride reduced or abolished calcium release to hormone.

6. The time course of calcium release from the mucosal surface due to hormone was rapid (commencing between 0·5 and 1·5 min after hormone application). Thus calcium release precedes the increase in sodium transport and hydro-osmotic flow following hormone, and appears to be at least as rapid as cyclic AMP generation in the tissue.

7. The relationship between calcium release or exchange and the permeability changes in the bladder to water and to sodium, following hormone, are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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