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Ann Nutr Metab 2012;61:199–206

The History of the Discovery of Vitamin D and Its Daughter Steroid Hormone

Norman A.W.

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Department of Biochemistry and Division of Biomedical Sciences, University of California Riverside, Riverside, Calif., USA

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Prof. Anthony W. Norman

Department of Biochemistry and Division of Biomedical Sciences

University of California Riverside

Riverside, CA 92521 (USA)

E-Mail Anthony.norman@ucr.edu

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It is largely through historical accident in the interval of 1920–1940 that vitamin D3 became classified as a vitamin rather than as a steroid hormone. The formal definition of a vitamin is that it is a trace dietary constituent required to produce the normal function of a physiological process or processes. The emphasis here is on trace and the fact that the vitamin must be supplied regularly in the diet; this implies that the body is unable to metabolically synthesize the vitamin in question. However, the ultraviolet exposure of 7-dehydrocholesterol present in the skin results in the photochemical production of vitamin D3. Thus, vitamin D3 becomes a true vitamin only when the animal or human does not have regular access to sunlight or ultraviolet light. Under normal physiological circumstances, all mammals, including humans, can generate, via ultraviolet exposure of 7-dehydrocholesterol present in the skin, adequate quantities of vitamin D3 to meet their nutritionally defined requirements. There is a vibrant historical record beginning in 1650 and culminating in 1963 concerned with the determination of the chemical structures of vitamin D3 and vitamin D2. A surprising aspect concerning vitamin D3 is that it is itself biologically inert. There are no known essential biological actions or contributions that rely specifically on the molecule vitamin D3. While chemists had certainly appreciated the strong structural similarity between the vitamins D and other steroids, this correlation was never widely acknowledged in the biological, clinical, or nutritional sciences until 1965–1970. The biological role of vitamin D3 is to serve as a substrate for the liver 25-hydroxylase which produces 25-hydroxyvitamin D3 [25(OH)D3]. 25(OH)D3 in turn serves as the substrate for the kidney proximal tubule 25(OH)D3-1α-hydroxylase enzyme which produces the steroid hormone 1α,25(OH)2-vitamin D3 [1α,25(OH)2D3].

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Article / Publication Details

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Abstract of Paper

Published online: November 26, 2012

Number of Print Pages: 8
Number of Figures: 3
Number of Tables: 0

ISSN: 0250-6807 (Print)
eISSN: 1421-9697 (Online)

For additional information: https://www.karger.com/ANM