Abstract
The rate of cholesterol esterification in plasma, plasma lecithin cholesterol acyltransferase (LCAT) activity and plasma lipoprotein levels have been measured in five subjects who underwent therapeutic plasma exchange to reduce their plasma cholesterol concentration. In the week following the exchange the cholesterol esterification rate and the plasma triglyceride concentration returned rapidly in parallel to pre-exchange levels, while high density lipoprotein (HDL) cholesterol and LCAT activity returned to normal more slowly but also in parallel. The data suggest that the rate-limiting factor for cholesterol esterification in plasma is unlikely to be solely the enzyme levels, but is probably a combination of factors, including the enzyme level and either substrate availabiltiy or product removal. Plasma very low density lipoprotein (VLDL) may either provide substrates for the reaction or provide a means of removing one of the products from the site of reaction.
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