Abstract
A short-term (12 h) infusion with mevinolin, a competitive inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A reductase, significantly lowered plasma cholesterol concentration in rats. After 7 days of continuous treatment hypocholesterolaemia disappeared, and this was coupled with a notable increase in the average volume of hepatocytes. Liver-cell hypertrophy was associated with a striking proliferation of the membranes of both rough and smooth endoplasmic reticulum, as well as with a tremendous increase in the number of peroxisomes. These structural changes are interpreted as the morphologic counterpart of the compensatory response of rat liver to the prolonged inhibitory effect of mevinolin on cholesterol synthesis.
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