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• W2188974216 abstract "ApoE synthesis and secretion, as a function of cellular cholesterol content and cholesterol efflux, was studied in thioglycolate-elicited mouse peritoneal macrophages. As expected, loading elicited macrophages with cholesterol induced a 5-fold increase in apoE secretion and a 2.5-fold increase in cellular apoE content over a 5-h period. Treatment of cholesterol-loaded cells with HDL3 further increased apoE secretion 1.7-fold and decreased cellular cholesterol by 20%. Treatment of cholesterol-loaded cells with HDL3 and SAH 58.035 (an ACAT inhibitor) increased apoE secretion 2.4-fold and decreased cellular cholesterol content by 35%. Treatment of the cells with the ACAT inhibitor alone suppressed apoE secretion by 40% but did not change cellular cholesterol content. Northern blot analysis of RNA indicated that cholesterol loading increased apoE mRNA 2-fold. ApoE mRNA levels were not further affected by treatment with HDL3 and/or the ACAT inhibitor. Cholesterol-loaded cells, in the absence of HDL3, secreted apoE into the media in two fractions as determined by column chromatography: a large molecular weight complex, (larger than HDL), and an essentially lipid-free protein. In the presence of HDL3, the cells secreted apoE in three fractions: a large molecular weight complex, an essentially lipid-free protein, and over 50% of apoE associated with HDL. In the process, HDL3 became larger and eluted in a position identical to that of HDL2. A small amount of HDL3-derived material was also transformed to an LDL-size particle. Incubation of HDL3 in the absence of cholesterol-loaded cells did not produce these changes. It is concluded that cholesterol-loading increases apoE mRNA content and apoE synthesis.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2188974216 created "2016-06-24" @default.
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• W2188974216 date "1989-06-01" @default.
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• W2188974216 title "Synthesis and secretion of apoE in thioglycolate-elicited mouse peritoneal macrophages: effect of cholesterol efflux." @default.
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• W2188974216 doi "https://doi.org/10.1016/s0022-2275(20)38303-6" @default.
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