PMID: 7091393Jul 1, 1982Paper

Effect of Na+ and ATP on peritubular Ca transport by the marine teleost renal tubule

The American Journal of Physiology
J L RenfroD S Miller

Abstract

Ca uptake rates and efflux rate coefficients were determined in isolated renal tubules of the winter flounder, Pseudopleuronectes americanus. Na-free medium and 10(-4) M ouabain depressed while 0.2 mM dinitrophenol stimulated Ca efflux. The effects on Ca movement appeared to be associated with the adenosine triphosphate (ATP) concentration of the tubular fluid space (TFS), rather than the bath-to-tissue Na gradient. Elevation of the ATP concentration of TFS by incubation of tissue in external ATP more than doubled Ca uptake rate. Inhibition of Ca uptake by lanthanum and stimulation by Ca ionophore A23187 suggested that ATP altered plasma membrane Ca transport. Incubation in external phosphate had no effect. Plasma membrane vesicles (PMV) prepared from flounder tubules showed saturable Ca uptake inhibited by Mg, unaffected by Na gradients, and stimulated by intravesicular but not extravesicular ATP. ATP appeared to stimulate PMV Ca uptake by increasing membrane Ca binding. We concluded that Ca uptake across the peritubular membranes was not directly linked to the serosal Na gradient but was greatly influenced by the intracellular ATP concentration.

Citations

Oct 7, 2006·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Pedro M GuerreiroAdelino V M Canario

Related Concepts

Adenosine Triphosphate, Chromium Ammonium Salt
Calcium
Renal Tubule Structure
Orthophosphate
Sodium

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