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Journal of Lipid Research, Vol. 13, 402-412, May 1972
Copyright © 1972 by Lipid Research, Inc.

HMG CoA reductase of intestinal mucosa and liver of the rat

S. Shefer , S. Hauser , V. Lapar , and E. H. Mosbach

Department of Laboratory Diagnosis, Public Health Research Institute of the City of New York, Inc., and the Bureau of Laboratories of the New York City Department of Health, New York 10016

Methods were developed for the determination of HMG CoA (3-hydroxy-3-methylglutaryl CoA) reductase activity in subcellular fractions of intestinal mucosa and liver of Wistar strain rats. In the liver, reductase activity was located exclusively in the microsomal fraction. In the intestinal mucosa, activity was found in both mitochondrial and microsomal fractions of crypt cells but not of villi. The microsomal HMG CoA reductases of liver and intestinal mucosa had similar kinetic characteristics and pH optima. However, the activity of the hepatic enzyme differed with age and sex of the experimental animals while that of the intestinal crypt cells did not. Cholestyramine treatment enhanced the activity of the microsomal HMG CoA reductase in both liver and intestinal mucosa. Reductase activity of the intestinal crypt cells was elevated in both jejunum and ileum. The greatest stimulation, both relatively and absolutely, was observed in the distal half of the jejunum.

Supplementary key words regulation • cholesterol biosynthesis • cholestyramine • subcellular fractions • villi • crypt cells

Submitted on November 2, 1971
Accepted on December 31, 1971

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