The Role of Skeletal Muscle in Maintaining Vitamin D Status in Winter
Open Access
- 25 July 2019
- journal article
- review article
- Published by Elsevier BV in Current Developments in Nutrition
- Vol. 3 (10), nzz087
- https://doi.org/10.1093/cdn/nzz087
Abstract
The status of vitamin D is determined mainly by its formation in skin by the photochemical action of solar UVB light (wavelength 290–320 nm) on the precursor 7-dehydrocholesterol. Because of seasonal variation in intensity of solar UV light, vitamin D status falls in winter and rises in summer. It has been presumed that there is no functional store of vitamin D. Thus, to avoid deficiency, a nutritional supply would be required in winter. However, there is now evidence that the main circulating metabolite of vitamin D, 25-hydroxyvitamin D, accumulates in skeletal muscle cells, which provide a functional store during the winter months. The mechanism is mediated by muscle cell uptake of circulating vitamin D–binding protein (DBP) through a megalin-cubilin membrane transport process. DBP then binds to cytoplasmic actin to provide an array of high-affinity binding sites for 25-hydroxyvitamin D [25(OH)D]. The repeated passage of 25(OH)D into and out of muscle cells would account for its long residence time in blood.Keywords
Funding Information
- Australian Research Council (DP170104408)
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