High Density Lipoprotein (HDL) Metabolism in Noninsulin-Dependent Diabetes Mellitus: Measurement of HDL Turnover Using Tritiated HDL*

Publisher Website
Google Scholar
Abstract
High density lipoprotein (HDL) kinetics were studied by injecting [3H]apoprotein A-I (apoA-I)/HDL into 12 subjects with normal glucose tolerance and 12 patients with noninsulin-dependent diabetes mellitus (NIDDM). The results indicate that the mean fractional catabolic rate (FCR) of apoA-I/HDL was significantly faster [0.63 ± 0.07 (±sem) vs. 0.39 ± 0.02 I/day; P < 0.001] and the apoA-I/HDL synthetic rate greater (29.4 ± 2.9 vs. 22.9 ± 1.3 mg/kg·day; P < 0.02) in patients with NIDDM than in normal subjects. Furthermore, there were statistically significant inverse relationships between apoA-I/HDL FCR and plasma levels of both HDL cholesterol (r = −0.71; P < 0.001) and apoA-I (r = −0.63; P < 0.001). In addition, the increase in apoA-I/HDL FCR was directly related to fasting plasma glucose (r = 0.78; P < 0.001) and insulin (r = 0.76; P < 0.001) concentrations. These data support the view that the decrease in plasma HDL cholesterol and apoA-I levels commonly found in patients with noninsulin-dependent diabetes i s due to an increase in the catabolic rate of apoA-I/HDL secondary to the defects in carbohydrate metabolism present in these patients. {J Clin Endocrinol Metab65: 512, 1987)