Summary
In order to assess the short-term effects of hyperinsulinaemia and hyperglycaemia on adipose tissue lipoprotein lipase activity and on serum lipoproteins, we measured these variables in ten normal subjects during euglycaemic and hyperglycaemic hyperinsulinaemic clamps. The mean steady-state plasma glucose and insulin concentrations, respectively, were 4.7 mmol/l and 101 mU/l during euglycaemic moderate-insulin clamp, 4.9 mmol/l and 565 mU/l during euglycaemic high-insulin clamp, and 8.8 mmol/l and 148 mU/l during hyperglycaemic clamp. Saline infusion was used as control. The adipose tissue lipoprotein lipase activity rose significantly over 5 h during high-insulin clamp (p<0.01) and during hyperglycaemic clamp (p<0.05), but did not change during the moderate-insulin clamp. The magnitude of change of lipoprotein lipase activity from baseline (either rise or fall) was inversely related to the preclamp activity during euglycaemic moderate-insulin clamp (r= -0.67), during hyperglycaemic clamp (r= -0.68) and during infusion of saline (r= -0.75, p<0.05). Total serum triglyceride concentration decreased significantly during all clamp studies compared with the control experiment. This change was mainly accounted for by a decrease of VLDL triglyceride. The LDL cholesterol level fell by an average of 5% (p<0.05) during the high-insulin clamp and by 10% (p<0.05) during the hyperglycaemic clamp. The HDL cholesterol level did not change significantly. It is concluded that adipose tissue lipoprotein lipase activity in man is increased by physiological insulin levels during hyperglycaemia and also by supraphysiological insulin levels during euglycaemia, but is not influenced by physiological hyperinsulinaemia without hyperglycaemia. Low basal lipoprotein lipase activity is more sensitive to insulin-glucose stimulation than primarily high lipoprotein lipase activity. Acute hyperinsulinaemia decreases VLDL triglyceride and LDL cholesterol concentrations.
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Yki-Järvinen, H., Taskinen, M.R., Koivisto, V.A. et al. Response of adipose tissue lipoprotein lipase activity and serum lipoproteins to acute hyperinsulinaemia in man. Diabetologia 27, 364–369 (1984). https://doi.org/10.1007/BF00304851
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DOI: https://doi.org/10.1007/BF00304851