代谢
在肝脏内,胆钙化醇通过维生素D-25-羟化酶酶的作用被羟基化成钙化二醇(25-羟基胆钙化醇)。在肾脏中,钙化二醇随后作为1-α-羟化酶的底物,产生钙三醇(1,25-二羟基胆钙化醇),这是维生素D3的生物活性形式。
Within the liver, cholecalciferol is hydroxylated to calcifediol (25-hydroxycholecalciferol) by the enzyme vitamin D-25-hydroxylase. At the kidney, calcifediol subsequently serves as a substrate for 1-alpha-hydroxylase, yielding calcitriol (1,25-dihydroxycholecalciferol), the biologically active form of vitamin D3.
来源:DrugBank