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Cholecalciferol 25-hydroxylation is similar in liver microsomes from male and female rats when cholecalciferol concentration is low.

We compared cholecalciferol 25-hydroxylation in liver microsomes of male and female rats. The rate of production of 25-hydroxycholecalciferol was similar in liver microsomes from female rats and those from male rats when cholecalciferol concentration ranged from 50 to 200 nmol/L. The liver cytosolic fraction stimulated the 25-hydroxylase activity of the microsomes up to 100% in both male and female rats at 44 nmol/L cholecalciferol. Cytosol metabolized cholecalciferol to a currently unidentified metabolite. At 300 nmol/L cholecalciferol, synthesis of the cytosolic metabolite was 100% greater than at 100 nmol/L and coincided with 32% lower synthesis of 25-hydroxycholecalciferol. These results suggest similar 25-hydroxy-lase activity in liver microsomes from male and female rats and similar ability of liver cytosol from these rats to stimulate 25-hydroxylation at low nanomolar concentrations of cholecalciferol, whereas inhibitory effects of cytosol at higher concentrations of cholecalciferol were shown.