Abstract
Although unesterified cholesterol and phospholipids exchange freely, a protein factor from the d > 1.25 g/ml plasma fraction was found to be necessary for cholesterol esters to transfer from HDL to LDL. This transfer was reversible, time-dependent and a function of the concentration of the d > 1.25 fraction, but independent of lecithin : cholesterol acyltransferase reaction. The transfer represented an equilibration of molecules, but no net mass transfer of cholesterol esters could be demonstrated from HDL to LDL.
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