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Original Articles

Cholesterol Metabolism in Alloxan-Induced Diabetic Rabbits

  1. Niall M G O'Meara,
  2. Rosaleen A M Devery,
  3. Daphne Owens,
  4. Patrick B Collins,
  5. Alan H Johnson and
  6. Gerald H Tomkin
  1. Department of Biochemistry, Royal College of Surgeons in Ireland Dublin Department of Metabolic Medicine, the Adelaide Hospital Dublin, Ireland, United Kingdom
  1. Address correspondence and reprint requests to Dr. Niall O'Meara, Department of Biochemistry, Royal College of Surgeons in Ireland, Dublin 2, Ireland, UK.
Diabetes 1990 May; 39(5): 626-633. https://doi.org/10.2337/diab.39.5.626
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Abstract

The effect of diabetes control on the activities of hydroxymethylglutaryl-CoA reductase (HMG-CoA reductase), cholesterol acyltransferase (ACAT), and phenol 2-monooxygenase, the major enzymes regulating cholesterol metabolism, was determined in alloxan-induced diabetic rabbits, and the results obtained were correlated with lipid and lipoprotein levels. Although intestinal HMG-CoA reductase activity was significantly increased (P < 0.001) in poorly controlled compared with moderately controlled diabetic rabbits, there was a significant reduction in the activities of intestinal ACAT (P < 0.01), hepatic HMG-CoA reductase (P < 0.05) and ACAT (P < 0.001), and phenol 2-monooxygenase (P < 0.01). The poorly controlled animals were hypercholesterolemic (P < 0.01), and this was reflected in the very-low-density and high-density lipoprotein fractions. Serum cholesterol levels in the nondiabetic and moderately controlled diabetic groups were similar. This increase in intestinal HMG-CoA reductase activity in the poorly controlled diabetic animals occurred in the absence of hyperphagia. Although abnormalities in cellular cholesterol metabolism could be partly responsible for the alterations in serum cholesterol levels in diabetes, the precise mechanisms underlying these enzymatic changes have yet to be elucidated.

  • Received May 1, 1989.
  • Revision received January 4, 1990.
  • Accepted January 4, 1990.
  • Copyright © 1990 by the American Diabetes Association

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May 1990, 39(5)
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Cholesterol Metabolism in Alloxan-Induced Diabetic Rabbits
Niall M G O'Meara, Rosaleen A M Devery, Daphne Owens, Patrick B Collins, Alan H Johnson, Gerald H Tomkin
Diabetes May 1990, 39 (5) 626-633; DOI: 10.2337/diab.39.5.626

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Cholesterol Metabolism in Alloxan-Induced Diabetic Rabbits
Niall M G O'Meara, Rosaleen A M Devery, Daphne Owens, Patrick B Collins, Alan H Johnson, Gerald H Tomkin
Diabetes May 1990, 39 (5) 626-633; DOI: 10.2337/diab.39.5.626
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© 2021 by the American Diabetes Association. Diabetes Print ISSN: 0012-1797, Online ISSN: 1939-327X.