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• W2401144828 endingPage "1669" @default.
• W2401144828 startingPage "1663" @default.
• W2401144828 abstract "The effects of prostaglandin (PG) E1, PGE2, the stable prostacyclin analogue Iloprost, and PGF2 alpha on low density lipoprotein (LDL) receptor activity and cholesterol synthesis were investigated in freshly isolated human mononuclear leukocytes. Incubation of cells for up to 45 hr in a lipid-free medium resulted in an increase in the rate of cholesterol synthesis from [14C]acetate and the high affinity accumulation and degradation of 125I-labeled LDL. Addition of PGE1 in increasing concentrations to the incubation medium inhibited cholesterol synthesis and the specific accumulation and degradation of 125I-labeled LDL; at a concentration of 10 microM, the inhibitions were 61%, 70%, and 67%, respectively, after an incubation of 20 hr. The effects of PGE2 and Iloprost were similar. The action of the prostaglandins on LDL receptor activity appeared to be mediated by a decrease in the number of LDL receptors and not by a change in the binding affinity. The prostaglandins yielded sigmoidal log concentration-effect curves. In contrast, PGF2 alpha had no influence on cholesterol synthesis or LDL receptor activity up to a concentration of 10 microM. PGE1, PGE2, and Iloprost, but not PGF2 alpha, led to an increase in the concentration of intracellular cyclic AMP. Dibutyryl cyclic AMP mimicked the effects of the E-prostaglandins and Iloprost on the LDL receptor activity. The results suggest that PGE1, PGE2, and prostacyclin affect LDL receptor activity and cholesterol synthesis and, therefore, may play a role in the regulation of cholesterol homeostasis and in the development of atherosclerosis." @default.
• W2401144828 created "2016-06-24" @default.
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• W2401144828 date "1988-12-01" @default.
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• W2401144828 title "Effects of prostaglandins on LDL receptor activity and cholesterol synthesis in freshly isolated human mononuclear leukocytes." @default.
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• W2401144828 doi "https://doi.org/10.1016/s0022-2275(20)38406-6" @default.
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