Hyperinsulinemia and insulin resistance are associated with multiple abnormalities of lipoprotein subclasses in glucose-tolerant relatives of NIDDM patients. Botnia Study Group.
We studied the subclasses of plasma lipoproteins in normolipidemic, glucose-tolerant male relatives of noninsulin dependent diabetic patients (NIDDM), who represented either the lowest (n = 14) or the highest (n = 18) quintiles of fasting plasma insulin. The higher plasma triglyceride level in the high insulin group (1.61 mmol/l vs. 0.87 mmol/l, P < 0.001) was due to multiple differences in triglyceride-rich lipoproteins. The concentrations of larger VLDL1, smaller VLDL2 particles, and IDL particles were 3.8-fold, 2.5-fold, and 1.5-fold higher, respectively, in the high insulin group than in the low insulin group (P < 0.01 or less). In addition, hyperinsulinemic subjects had VLDL1, VLDL2, and IDL particles enriched in lipids and poor in protein. The lower plasma HDL cholesterol level in the high insulin group (1.20 mmol/l vs. 1.44 mmol/l, P < 0.01) compared to the low insulin group was a consequence of a 27% reduction of HDL2a concentration (P < 0.05) and a significantly reduced percentage of cholesterol in HDL3a, HDL3b, and HDL3c subclasses. On the other hand, the percentages of triglycerides in HDL2b, HDL2a, HDL3a, and HDL3b subclasses were 76%, 79%, 61%, and 50% higher, respectively, in the high insulin group than in the low insulin group (P < 0.01 or less). In the combined group, the concentration of VLDL1 and VLDL2 correlated positively with the concentrations of LDL2 and LDL3 and negatively with HDL2b and HDL2a subclasses (P < 0.05 or less). In conclusion, normolipidemic, glucose-tolerant but hyperinsulinemic relatives of NIDDM patients have qualitatively similar lipoprotein abnormalities as NIDDM patients. These abnormalities are not observed in insulin-sensitive relatives, suggesting that they develop in concert with insulin resistance.
Tilly-Kiesi
M
M
Department of Medicine, University of Helsinki, Finland.
Knudsen
P
P
Groop
L
L
Taskinen
M R
MR
D000328:Adult; D000368:Aged; D008076:Cholesterol, HDL / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000235:genetics; D005190:Family; D006801:Humans; D006946:Hyperinsulinism / Q000097:blood*; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D008075:Lipoproteins, HDL / Q000097:blood*; D008079:Lipoproteins, VLDL / Q000097:blood*; D008297:Male; D008875:Middle Aged; D014280:Triglycerides / Q000097:blood
D008076:Cholesterol, HDL; D007328:Insulin; D008075:Lipoproteins, HDL; D008079:Lipoproteins, VLDL; D014280:Triglycerides