Abstract
BACKGROUND: Ghrelin is known as a new endocrine component supposed to have an influence in control of feeding behavior and energy balance. Recent studies have shown that ghrelin concentration in the subjects with diabetes mellitus type 2 (DM 2) is lower than normal. To clarify the relationship between ghrelin and insulin resistance and also DM 2, a cross-sectional study was designed. METHODS: In a cross-sectional study, 87 subjects were enrolled in three groups, 29 with DM2, 29 pre-diabetes state and 29 normoglycemic subjects of first-degree relatives of diabetic group. After clinical examination, blood samples were taken to measure fasting blood glucose, HbA1c, lipids, insulin, leptin and acylated ghrelin concentrations. RESULTS: Mean serum concentrations of acylated ghrelin in all groups (47.4 ± 27.9 pg/ml) were lower than normal values (150.3 ± 56.4 pg/ml) (P: 0.006) without significant difference within groups comparison(P: 0.1). A significant correlation was found between ghrelin concentration with body mass index (BMI) (r: -0.23, p <0.02) and abdominal circumference (AC) (r: -0.28, P < 0.008). Also inverse relationship between ghrelin level and insulin resistance (HOMA-IR) (r: -.032, p: 0.002) was seen in all subjects. Leptin level has a significant correlation with abdominal circumference (AC) and BMI (P < 0.0001) but not with ghrelin. CONCLUSION: This study showed that obesity has a strong association with the reduced level of ghrelin concentration. It seems that the process of ghrelin reduction is initiated in earlier stages of insulin resistance prior to the onset of overt DM.