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Effect of streptozotocin-induced diabetes on the activity of 7 alpha-hydroxy-4-cholesten-3-one-specific 12 alpha-hydroxylase in rats.

The activity of 12 alpha-hydroxylase in hepatic microsomes from normal, streptozotocin-induced diabetic, and insulin-treated diabetic rats was studied with 7 alpha-hydroxy-4-cholesten-3-one as a substrate. In the diabetic rats, the 12 alpha-hydroxylase activity was about 50% lower than in the normal rats. Treatment of the diabetics with insulin cancelled the reduction of the activity. These results show that an insulin-deficient state causes a paradoxical decrease in the activity of the key enzyme for cholic acid formation.