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Interrelationships Between the Key Elements of the Vitamin D Endocrine System: 25-OH-D3-1-Hydroxylase, Serum Calcium and Phosphorus Levels, Intestinal 1,25(OH)2D3, and Intestinal Calcium Binding Protein

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Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 81))

Abstract

Calcium and phosphorus homeostasis is exquisitely regulated by the three hormones, calcitonin, parathyroid hormone, and cholecalciferol (vitamin D3). The most notable advance in our understanding of the mechanism of action of vitamin D has been the elucidation of the complex metabolic pathway which has evolved to produce the biologically active form, 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]. Coupled with these developments concerning our understanding of the metabolic pathway of conversion of vitamin D into its active form, has been the realization that the mechanism of action of the fat soluble vitamin D is in reality similar to that of many of the classical steroid hormones, e.g. aldosterone, testosterone, estrogen, hydrocortisone, and ecdysterone. It should be noted that chemically vitamin D is in reality a steroid, in particular a seco steroid. Seco steroids are those in which one of the rings has undergone fission; in the instance of calciferol, this is ring B.

This work was supported by United States Public Health Service grants AM-09012 and AM-14,750.

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Norman, A.W., Friedlander, E.J., Henry, H. (1977). Interrelationships Between the Key Elements of the Vitamin D Endocrine System: 25-OH-D3-1-Hydroxylase, Serum Calcium and Phosphorus Levels, Intestinal 1,25(OH)2D3, and Intestinal Calcium Binding Protein. In: Massry, S.G., Ritz, E. (eds) Phosphate Metabolism. Advances in Experimental Medicine and Biology, vol 81. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-4217-5_23

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  • DOI: https://doi.org/10.1007/978-1-4613-4217-5_23

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