High density lipoprotein (HDL) metabolism in noninsulin-dependent diabetes mellitus: measurement of HDL turnover using tritiated HDL.
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 1/day; P less than 0.001] and the apoA-I/HDL synthetic rate greater (29.4 +/- 2.9 vs. 22.9 +/- 1.3 mg/kg X day; P less than 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 less than 0.001) and apoA-I (r = -0.63; P less than 0.001). In addition, the increase in apoA-I/HDL FCR was directly related to fasting plasma glucose (r = 0.78; P less than 0.001) and insulin (r = 0.76; P less than 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 is due to an increase in the catabolic rate of apoA-I/HDL secondary to the defects in carbohydrate metabolism present in these patients.
D000368:Aged; D016632:Apolipoprotein A-I; D001054:Apolipoproteins A / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D005260:Female; D006801:Humans; D007328:Insulin / Q000097:blood; D008075:Lipoproteins, HDL / Q000097:blood*; D008077:Lipoproteins, LDL / Q000097:blood; D008079:Lipoproteins, VLDL / Q000097:blood; D008297:Male; D008875:Middle Aged; D014316:Tritium
D016632:Apolipoprotein A-I; D001054:Apolipoproteins A; D008076:Cholesterol, HDL; D007328:Insulin; D008075:Lipoproteins, HDL; D008077:Lipoproteins, LDL; D008079:Lipoproteins, VLDL; D014316:Tritium