Vitamin D metabolism and mechanisms of calcium transport. | Zendy

Rajiv Kumar | Zendy

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Vitamin D metabolism and mechanisms of calcium transport.

Author(s) -

Rajiv Kumar

Publication year - 1990

Publication title -

journal of the american society of nephrology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.451

H-Index - 279

eISSN - 1533-3450

pISSN - 1046-6673

DOI - 10.1681/asn.v1130

Subject(s) - calcium , chemistry , reabsorption , vitamin , vitamin d and neurology , calcium metabolism , trpv6 , enterohepatic circulation , metabolism , endocrinology , kidney , biochemistry , medicine , biology , organic chemistry

Vitamin D3 undergoes sequential hydroxylations in the liver and kidney to form 1,25-dihydroxyvitamin D3, the biologically active form of the vitamin. 1,25-dihydroxyvitamin D3 is metabolized by several processes in various target tissues that decrease the biological activity of the sterol. In addition, 1,25-dihydroxyvitamin D3 is excreted in the bile as polar metabolites, such as glucuronides and, possibly sulfates and neutral polar steroids. These compounds undergo an enterohepatic recirculation in both man and experimental animals. 1,25-dihydroxyvitamin D3 increases the absorption of calcium in the intestine and the reabsorption of calcium in the kidney. It induces the synthesis of several proteins, the most notable of which is calcium binding protein that is thought to play a role in the absorption of calcium. The vitamin D-dependent calcium binding proteins and the calcium-magnesium ATPase calcium pump are co-localized in several tissues that play a role in the absorption of calcium.

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