Serum leptin concentrations in young insulin-sensitive and insulin-resistant volunteers

The aim of this study was to compare metabolic profiles and serum leptin co ncentrations between young insulin-sensitive and insulin-resistant subjects . A cross-sectional study was performed in 32 healthy, non-obese, young vol unteers. Assessing of insulin sensitivity, serum leptin concentration,serum uric acid, creatinine levels and lipid profile were done on all subjects. An insulin suppression test modified with octreotide was performed to asses s insulin sensitivity. Steady state glucose (SSG) and steady state insulin concentrations were calculated. Based on the SSG data, the volunteers were divided into four quartiles, considering as insulin-sensitive individuals t hose from quartile 1 to quartile 3, and insulin-resistant subjects those in quartile 4. Characteristics of both groups were compared, including metabo lic profile and leptin levels. After dividing SSG into quartiles, 24 subjec ts were considered as insulin-sensitive individuals, and 8 were assessed as insulin-resistant subjects. Total cholesterol and low-density lipoprotein (LDL) cholesterol were significantly higher in the insulin-resistant group than in the insulin-sensitive group. Serum leptin concentration was signifi cantly higher (p = 0.05) in insulin-resistant women (6.7 +/- 3.1 ng/ml) tha n those considered as insulin-sensitive (3.7 +/- 2.3 ng/ml). In conclusion, insulin-resistant subjects had higher concentrations of total cholesterol and LDL-cholesterol compared to insulin-sensitive individuals. Serum leptin level was higher in insulin-resistant women than those considered as insul in-sensitive.