Increased VLDL in nephrotic patients results from a decreased catabolism while increased LDL results from increased synthesis

Kidney International
M G de Sain-van der VeldenT J Rabelink

Abstract

Increased very low density lipoprotein (VLDL) in nephrotic patients results from a decreased catabolism while increased low density lipoprotein (LDL) results from increased synthesis. Hyperlipidemia is a hallmark of nephrotic syndrome that has been associated with increased risk for ischemic heart disease as well as a loss of renal function in these patients. The hyperlipidemia usually is characterized by increased cholesterol levels, although hypertriglyceridemia may be present as well. The factors that determine the phenotype of nephrotic dyslipidemia are not understood, nor has the primary stimulus for nephrotic hyperlipidemia been identified. One hypothesis is that nephrotic hyperlipidemia is the result of a coordinate increase in synthesis of proteins by the liver. To address these issues we simultaneously measured the in vivo rate of VLDL apolipoprotein B100 (apo B100) secretion, LDL apo B100 synthesis and albumin synthesis in patients with a nephrotic syndrome (N = 8) and compared them with a control group (N = 7) using a primed/continuous infusion of the stable isotope L-[1-13C] valine for six hours. Kinetic data were analyzed by multicompartmental analysis. Patients studied had combined hyperlipidemia as reflected by a...Continue Reading

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