Lipid accumulation in the livers of chlorpromazine-treated rats does not induce peroxisome proliferation

Treatment of rats with 25 mg/kg/day of the neuroleptic drug chlorpromazine for periods of 7, 28 or 90 days causes a slow accumulation of lipid in large droplets in centrilobular hepatocytes. There is little or no damage to hepatocytes as assessed by changes in glucose-6-phosphatase activity and by electron microscopy. Furthermore there is no indication of a change in peroxisomal beta-oxidation of fatty acids or in microsomal omega-oxidation of fatty acids. It is, therefore, clear that lipid accumulation in the liver does not automatically induce peroxisomal and microsomal fatty acid oxidising enzymes.