Citations to this article

Effects of Dietary Calcium Restriction and Chronic Thyroparathyroidectomy on the Metabolism of [3H]25-Hydroxyvitamin D3 and the Active Transport of Calcium by Rat Intestine
Murray J. Favus, … , Marlin W. Walling, Daniel V. Kimberg
Murray J. Favus, … , Marlin W. Walling, Daniel V. Kimberg
Published April 1, 1974
Citation Information: J Clin Invest. 1974;53(4):1139-1148. https://doi.org/10.1172/JCI107652.
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Research Article

Effects of Dietary Calcium Restriction and Chronic Thyroparathyroidectomy on the Metabolism of [3H]25-Hydroxyvitamin D3 and the Active Transport of Calcium by Rat Intestine

Abstract

Previous studies have shown that chronically thyroparathyroidectomized (TPTX) rats, fed a diet with restricted calcium but adequate phosphorus and vitamin D content, have higher levels of intestinal calcium absorption than controls. The results of recent acute experiments have suggested that parathyroid hormone (PTH) may be essential for regulating the renal conversion of 25-hydroxyvitamin D3 (25-OH-D3) to 1,25-dihydroxyvitamin D3 [1,25-(OH)2-D3] in response to dietary calcium deprivation. Since 1,25-(OH)2-D3 is the form of the vitamin thought to be active in the intestine, increases in calcium transport mediated by this metabolite would not be expected to occur in the absence of the parathyroid glands if the preceding model is correct. The present study was undertaken to examine the chronic effects of both dietary calcium restriction and the absence of PTH on the metabolism of [3H]25-OH-D3 and duodenal calcium-active transport in rats given thyroid replacement. These relatively long term studies confirm earlier observations which indicated that the adaptation of calcium absorption to a low calcium intake occurs in both sham-operated and TPTX animals.

Authors

Murray J. Favus, Marlin W. Walling, Daniel V. Kimberg

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Year: 2023 2022 2019 2017 2014 2011 2010 1989 1988 1985 1983 1982 1980 1978 1977 1976 1975 1974 Total
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