Structure-Function Relationships in the Vitamin D Endocrine System*

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ID: 296187
1995
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Abstract
RESEARCH directed at defining the molecular mode of action of vitamin D is currently at its apex. There is now evidence implicating the essential involvement of vitamin D metabolites in a host of cellular processes, including calcium homeostasis, immunology, cell differentiation, and regulation of gene transcription. Further, there is evidence that the hormonally active form of vitamin D, 1α,25-dihydroxyvitamin D3 [1α,25(OH)2D3], may generate biological responses via both regulation of gene transcription as well as via nongenomic pathways, some of which involve opening of voltage-gated Ca2+ channels. In addition, there are many examples of pathological disruption of the normal state in which a drug form of a vitamin D metabolite is proposed to be a (potentially) useful form of treatment, e.g. renal osteodystrophy, psoriasis, leukemia, breast cancer, and osteoporosis. The importance of the molecule vitamin D in the biological systems of higher animals has been recognized since its discovery by Mellanby in 1920 (1). It was in the interval of 1920–1930 that vitamin D officially became classified as a "vitamin" that was essential for the normal development of the skeleton and maintenance of Ca2+ homeostasis. The chemical structure of vitamin D was not determined until 1932 (2), and it was only then that it was apparent that this important nutritional substance was in reality a steroid, more specifically, a secosteroid, indicating that one of the rings of the cyclopentanoperhydrophenanthrene ring structure (the 9–10 carbon-carbon bond of ring B) was broken (see Section II).
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Authors R. Bouillon, William H. Okamura, Anthony W. Norman
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Journal endocrine reviews
Year 1995
DOI
10.1210/edrv-16-2-200
URL
https://doi.org/10.1210/edrv-16-2-200
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