High-density lipoprotein apolipoprotein AI and AII turnover in moderate and severe proteinuria.

The kinetic parameters of high-density lipoprotein (HDL) and its major apolipoproteins (Apo) AI and Apo AII were studied in 2 patients with moderate and severe proteinuria and 2 normal controls after intravenous injection of autologous 125I-HDL. The fractional catabolic rates (FCR) of HDL estimated by urine/plasma radioactivity ratio, and FCR of Apo AI and Apo AII calculated from the radioactivity decay curves were higher in the patients. These results support the concept that high-density lipoproteinuria and renal parenchymal sequestration of HDL found in the nephrotic syndrome contribute to accelerated HDL catabolism.