Biochemistry and metabolism of vitamin D

Some aspects of the metabolism and biochemistry of vitamin A.

The metabolism of vitamin A Formation of retinof, retinyl esters and retinal. Dietary provitamins and vitamin A are sources of tissue deposits of retinol, retinyl esters and retinal; the latter substances constitute a storage and transport system (Ganguly, 1960) which allows a continuous supply of the active form of the vitamin to be provided at whatever site it is required. T h e alcohol, alde...

Vitamin D Metabolism and Physiology

Background. Vitamin D insufficiency may lead to various health problems. By encouraging sun protection to prevent skin cancer, physicians may be limiting a major source of vitamin D for many individuals. Methods. We did a literature review on issues related to vitamin D inadequacy, particularly those relevant to various racial/ethnic groups. Results. Vitamin D is an important hormone with many ...

Vitamin D and Phospholipid Metabolism.

Although it has been known for many years that the primary physiological action of vitamin D is to improve calcium absorption from the small intestine (1,2), studies on calcium metabolism alone have thus far failed to elucidate the biochemical mechanism of action of vitamin D. Ry using everted intestinal sacs, Schacht,er and Rosen (3) have shown that vitamin D increases the transport of *%a aga...

Regulation of vitamin D and calcium metabolism

Fifteen men, who had undergone Billroth I gastrectomy and 19 men who had undergone Billroth II gastrectomy were studied with respect to vitamin D and other indices of calcium metabolism. The Billroth I group had hypocalcaemia, raised concentration of serum alkaline phosphatase, and reduced bone mineral content. The same biochemical disturbances were found in the Billroth II group, but bone mine...

Vitamin D metabolism. Recent advances.