Glucose-stimulated insulin response in non-diabetic patients with lipoprotein lipase deficiency and hypertriglyceridemia

Abstract 

Elevations in plasma triglyceride (TG) and free fatty acid (FFA) concentrations are generally thought to play a role in the pathogenesis of insulin-resistant diabetes. The objective of this study was to investigate the relationship between hypertriglyceridemia and glucose-stimulated insulin responsiveness in non-diabetic patients. Forty subjects were divided into three BMI-matched groups as follows: one group consisted of 8 patients with a lipoprotein lipase (LPL) deficiency, another consisted of 12 patients with hypertriglyceridemia and a third consisted of 20 subjects with normal TG levels. In response to a 75g oral glucose tolerance test, plasma insulin levels in the LPL-deficient subjects were higher (106±11μU/ml) than those in the hypertriglyceridemic (69±16μU/ml) and normolipidemic (29±3μU/ml) subjects, at 30min. On the other hand, their plasma glucose levels (127±6mg/dl) were less than those seen in the normolipidemic group (165±9mg/dl) after 90min.

Thus, LPL-deficient subjects with hypertriglyceridemia displayed an enhanced glucose-stimulated insulin response as well as lower blood glucose levels, the latter of which is not generally seen in those with hypertriglyceridemia and normolipidemia.

Keywords: lipoprotein lipase deficiency, Impaired glucose tolerance, Insulin secretion, Hypertriglyceridemia