THE PLASMA-LEVEL OF 7-ALPHA-HYDROXY-4-CHOLESTEN-3-ONE REFLECTS THE ACTIVITY OF HEPATIC CHOLESTEROL 7-ALPHA-HYDROXYLASE IN MAN

Circulating levels of 7-alpha-hydroxy-4-cholesten-3-one have been compared with activities of the rate-limiting enzyme in bile acid synthesis, microsomal cholesterol 7-alpha-hydroxylase, measured in liver biopsies obtained from patients undergoing surgery for gallstone disease. Some patients were treated with cholestyramine or bile acids prior to operation in order to alter the feed-back inhibition of the enzyme. The levels of the sterol were similar in untreated patients and in patients treated with ursodeoxycholic acid (median concentration 17 and 13 ng/ml, respectively), and so were the activities of the enzyme (median activity 7.0 and 5.5 pmol/min/mg protein, respectively). The sterol levels and enzyme activities were significantly increased in patients treated with cholestyramine (91 ng/ml and 45 pmol/min/mg protein) and decreased in patients treated with chenodeoxycholic acid (< 2.0 ng/ml and 0.7 pmol/min/mg protein). There was a strong positive correlation (r = 0.90, P < 0.00001) between levels of 7-alpha-hydroxy-4-cholesten-3-one in plasma and the activities of cholesterol 7-alpha-hydroxylase in the whole patient group. The results show that analysis of 7-alpha-hydroxy-4-cholesten-3-one in plasma is a sensitive and convenient method to determine relative rates of bile acid production in man.