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• W1966185425 abstract "We correlated the activity of the rate-limiting enzyme of cholesterol biosynthesis, 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, with the sterol content and composition of mucosal cells from the ileum of three homozygous sitosterolemic subjects and one control subject. In this inherited disease, whole-body cholesterol biosynthesis is decreased and increased amounts of sitosterol are absorbed from the intestine and deposited in tissues. For comparison, similar measurements were obtained in the ileal mucosa of sitosterol-fed rats where sitosterol accounted for 11% of enterocyte sterols. In the three sitosterolemic homozygotes, sitosterol represented 9% to 11% of the total microsomal sterols in the intestinal mucosa, although normal architecture for both crypts and villi is observed. The mean ileal microsomal HMG-CoA reductase activity in the three homozygotes was less than half of control values. In the ileum of sitosterol-fed rats with increased mucosal sitosterol concentrations, microsomal HMG-CoA reductase activity was not inhibited. These results show that in three sitosterolemic homozygotes, abnormally low HMG-CoA reductase activity was detected in the ileum, as previously demonstrated in mononuclear leukocytes and liver. The failure of the increased tissue sitosterol pool to inhibit HMG-CoA reductase in rat ileum suggests that deficient cholesterol biosynthesis in homozygous sitosterolemia is inherited and is not due to feedback inhibition by tissue sitosterol." @default.
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• W1966185425 date "1994-07-01" @default.
• W1966185425 modified "2023-10-01" @default.
• W1966185425 title "Deficient ileal 3-hydroxy-3-methylglutaryl coenzyme A reductase activity in sitosterolemia: Sitosterol is not a feedback inhibitor of intestinal cholesterol biosynthesis" @default.
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• W1966185425 doi "https://doi.org/10.1016/0026-0495(94)90266-6" @default.
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