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VITAMIN D AND HEALTH IN THE 21ST CENTURY: BONE AND BEYOND |
1 From the Department of Biochemistry, University of Wisconsin-Madison
ABSTRACT
Vitamin D3 is a prohormone produced in skin through ultraviolet irradiation of 7-dehydrocholesterol. It is biologically inert and must be metabolized to 25-hydroxyvitamin D3 in the liver and then to 1
,25-dihydroxyvitamin D3 in the kidney before function. The hormonal form of vitamin D3, ie, 1,25-dihydroxyvitamin D3, acts through a nuclear receptor to carry out its many functions, including calcium absorption, phosphate absorption in the intestine, calcium mobilization in bone, and calcium reabsorption in the kidney. It also has several noncalcemic functions in the body. This overview provides a brief description of the physiologic, endocrinologic, and molecular biologic characteristics of vitamin D. It also provides information on new selective analogs of 1,25-dihydroyvitamin D3 for therapy.
Key Words: Vitamin D metabolism • bone • calcium homeostasis • tetany • vitamin D endocrine system • autoimmune diseases
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