Abstract
Addition of triglyceride/phospholipid emulsion to adult guinea pig plasma more than doubled the cholesteryl ester (CE) production. Plasma from newborn guinea pigs was stimulated to a lower degree. The increase in CE production was dependant on the type and amount of phospholipids in the lipid emulsions. Egg phospholipids stimulated the cholesterol esterification while partially hydrogenated soy phospholipids (with high content of saturated fatty acids) inhibited the reaction. The stimulation of CE formation was probably due to transfer of phosphatidyl choline (PC) from the emulsion to the high density lipoproteins since the stimulation was: (a) dependant on a preincubation time, (b) less pronounced in newborn animals with high plasma PC levels, and (c) detected in plasma fractions from which the lipid emulsion had been removed.
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