The most active form of vitamin D is 1,25-dihydrocholecalciferol (calcitriol). The mechanism of its action seems to be similar to that mediating the actions of the steroid hormones: that is, binding to an intranuclear receptor protein which in turn binds to regulatory sequences on chromosomal DNA. This receptor is known to be present in most nucleated cells in the body, and vitamin D has come to be regarded as a steroid hormone.
The most dominant function of vitamin D in its active form (calcitriol) is the elevation of plasma calcium and phosphate levels which are required for bone mineralization (2).
Reference
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