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Thematic review series: patient-oriented research What have we learned about HDL metabolism from kinetics studies in humans?Rashid S; Patterson BW; Lewis GFJ Lipid Res 2006[Aug]; 47 (8): 1631-42Plasma measurements of lipids, lipoproteins, and apolipoproteins provide information on the static levels of these fractions without providing key information on the dynamic fluxes of lipoproteins in the circulation. Kinetics studies, in contrast, provide additional information on the production and clearance rates of lipoproteins and the flow of lipids and apolipoproteins through lipoprotein fractions. This information is crucial in accurately delineating the metabolism of HDL in plasma, because plasma concentrations of HDL are the net result of the de novo production and catabolism of HDL as well as the recycling of HDL particles and the contribution to HDL from components of other lipoproteins. Studies aimed at measuring the metabolism of HDL particles have shown that HDL metabolism in vivo is complex and consists of multiple components. Kinetics studies provide a window into the metabolism of HDL, allowing us to better understand the mechanisms of HDL decrease in human conditions and the functionality of HDL particles. Here, we review the progress in our understanding of HDL metabolism derived from in vivo kinetics studies, focusing primarily on studies in humans but also reviewing key studies in animal models.|Animals[MESH]|Apolipoproteins/blood/metabolism[MESH]|Humans[MESH]|Insulin Resistance/physiology[MESH]|Kinetics[MESH]|Lipid Metabolism/physiology[MESH]|Lipoproteins, HDL/blood/*metabolism[MESH] |
