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Nutrient Metabolism

The Selective Estrogen Receptor Modulator Acolbifene Reduces Cholesterolemia Independently of Its Anorectic Action in Control and Cholesterol-Fed Rats¹

Laval Hospital Research Center, Department of Anatomy and Physiology, Faculty of Medicine, Laval University, Quebec City, QC, Canada and ^* Molecular Endocrinology and Oncology Research Center of Laval University Hospital Center, Department of Anatomy and Physiology, Faculty of Medicine, Laval University, Quebec City, QC, Canada

²To whom correspondence should be addressed. E-mail: yves.deshaies{at}phs.ulaval.ca.

The cancer-preventing selective estrogen receptor modulator (SERM) acolbifene (ACOL) exerts a potent and pure antiestrogenic action in the mammary gland and uterus, yet it displays beneficial, estrogen-like actions on energy and lipid metabolism in rodents. The compound reduces food intake and strongly decreases cholesterolemia in rats fed a cholesterol-free diet. This study was designed to establish whether the anorectic effect of ACOL is involved in its cholesterol-lowering action, and whether the compound retains its ability to lower cholesterol concentrations in rats with diet-induced hypercholesterolemia. Female rats were fed a purified diet devoid of cholesterol (reference diet) or containing 2% cholesterol (C-diet); they were either not treated or treated daily with ACOL or not treated and pair-fed to the ACOL-treated rats. The C-diet did not affect food intake or weight and fat gains. ACOL reduced food intake (16%) and weight gain (45%, mainly fat) similarly in both dietary cohorts. ACOL, but not pair feeding, reduced cholesterolemia by 33% in rats fed the reference diet. As expected, the C-diet raised serum total cholesterol almost 3-fold and this increase was largely prevented by ACOL but not by pair feeding. Cholesterol was reduced by ACOL, mainly in the HDL fraction, in rats fed the reference diet, but only in the non-HDL fraction in those fed the C-diet. In livers of rats fed the reference diet, ACOL, but not pair feeding, increased protein abundance of the scavenger receptor, class B, type 1, and the LDL receptor, thought to be involved in ACOL-mediated cholesterol lowering. These findings demonstrate that the potent hypocholesterolemic action of ACOL is independent of the concomitant reduction in food intake and fat accretion, and that such action occurs in rats with overt diet-induced hypercholesterolemia.

KEY WORDS: • estrogen antagonist • diet-induced hypercholesterolemia • blood cholesterol • scavenger receptor B1 • LDL receptor