Abstract
In rats fed a cholesterol-cholic acid supplemented diet, implantation of a 75 mg morphine pellet elevated total plasma cholesterol, raised low density lipoprotein (LDL) plus very low density lipoprotein (VLDL) cholesterol, and lowered high density lipoprotein (HDL) cholesterol levels. The resultant increase of the atherogenic index was accompanied by enhanced aortic cholesterol deposition. These alterations were prevented by daily administration of naltrexone (1.0 mg/kg, sc), and were not associated with hyperphagic or hepatotoxic actions of morphine. An increase in total plasma cholesterol and in LDL plus VLDL cholesterol was also observed in morphine pelleted rats maintained on a normal diet. The possible implications of opiate-induced hypercholesterolemia are discussed.
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