Nephron
Original Paper
The Effects of High Calcium Concentrations on Renal Ammoniagenesis by Rat Kidney SlicesVavatsi-Manos O. · Preuss H.G.Department of Medicine and Department of Pathology, Nephrology Division, Georgetown University School of Medicine, Washington, D. C.
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Article / Publication Details
Received: March 24, 1975
Accepted: November 18, 1975
Published online: November 28, 2008
Issue release date: 1976
Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0
ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)
For additional information: https://www.karger.com/NEF
Abstract
Deficiences in acid excretion during hypercalcemia have been reported, and this defect has been ascribed to a deficiency in ammonia excretion. Because no changes in urine pH and urine flow occurred to explain decreased ammonia excretion, this suggested to us that decreased excretion was secondary to decreased renal ammonia production. To test this hypothesis, we investigated the ability of kidney slices from rats to produce ammonia and glucose and to consume oxygen when incubated in varying concentrations of calcium. High medium concentrations of calcium (3 and 4 mM) decreased kidney slice ammoniagenesis from glutamine and glutamate and kidney slice oxygen consumption while not affecting gluconeogenesis. Based upon our findings, we propose that hypercalcemia decreases urine ammonia excretion by depressing renal ammonia production.
© 1976 S. Karger AG, Basel
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Article / Publication Details
Received: March 24, 1975
Accepted: November 18, 1975
Published online: November 28, 2008
Issue release date: 1976
Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0
ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)
For additional information: https://www.karger.com/NEF
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