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Effects of Vitamin E Deficiency on the Distribution of Cholesterol in Plasma Lipoproteins and the Activity of Cholesterol 7-Hydroxylase in Rabbit Liver¹

Department of Biochemistry, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand

Vitamin E-deficient rabbits with signs of muscular dystrophy showed accumulation of cholesterol in muscle as well as elevation of plasma cholesterol. The increase in plasma cholesterol was detected in low density lipoprotein (LDL) and very low density lipoprotein (VLDL) but not in high density lipoprotein (HDL) fractions of plasma lipoproteins. In liver, the activity of cholesterol 7-hydroxylase, the key enzyme involved in degradation of cholesterol, was approximately one-fifth that of control rabbits. Cytochrome P-450 level of liver microsomes was also reduced significantly. These results suggested that accumulation of cholesterol observed in dystrophic muscle of vitamin E-deficient rabbits may be due to an increase in LDL and VLDL cholesterol, the plasma lipoproteins carrying cholesterol to peripheral tissue, and to a decrease in cholesterol 7-hydroxylase activity, whose activity may have been affected by the reduced level of cytochrome P-450.

KEY WORDS: • vitamin E deficiency • cholesterol • plasma lipoproteins • cholesterol 7-hydroxylase • cytochrome P-450

¹ This study was supported by a grant from the National Research Council of Thailand.

Manuscript received 29 October 1984.