Abstract
These studies were performed to determine the role of plasma lipid transfer activity in the regulation of plasma total and lipoprotein cholesterol in vivo. Partially purified human lipid transfer activity was injected into rats at a level similar to that of normal rabbit plasma, d greater than 1.21. The disappearance of exogenous lipid transfer activity from rat plasma was biphasic, with a 70% loss within 6 h. The remaining 30% was lost with a half-time of about 14 h. In the rat, short-term exposure (6 h) to high levels of lipid transfer activity resulted in a net transfer of cholesteryl esters from high density to d less than 1.019 lipoproteins, without affecting plasma total cholesterol. However, the lipid transfer activity-induced changes in lipoprotein cholesterol were not evident after 24 h, despite the fact that the lipid transfer activity of rat plasma d greater than 1.21 was similar to that of human plasma d greater than 1.21 during the preceding 18 h.
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