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The effects of activation on lipid and lipoprotein metabolism were examined in resident murine macrophages, inflammatory cells elicited by thioglycolate, primed cells elicited by pyran copolymer, and activated cells elicited by Corynebacterium parvum. Low density lipoprotein receptors were reduced by 70%, while scavenger receptors were reduced 60% in activated cells. Basal cholesteryl ester and triglyceride synthesis were increased fourfold in activated cells, whereas the activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase was high in resident cells and progressively declined by greater than 80% in activated cells. Activities of neutral cholesteryl esterase and neutral triglyceride lipase were increased two- to fourfold in inflammatory, primed, and activated macrophages. These results demonstrate the diverse changes in lipid and lipoprotein metabolism that occur with activation and emphasize how the behavior of macrophages in atherosclerotic lesions can be altered by activation.

Effects of activation on lipid and lipoprotein metabolism in murine macrophages.