Serum Irisin and Oxytocin Levels as Predictors of Metabolic Parameters in Obese Children

Objective: Irisin and oxytocin can affect energy homeostasis and it has been suggested that they may play an important role in reducing obesity and diabetes. In this study, we aimed to determine the relationship between metabolic parameters (including irisin and oxytocin levels) and anthropometric parameters in obese children. Methods: Ninety obese children (mean age, 13.85 +/- 1.63 years) and 30 healthy controls (mean age, 14.32 +/- 1.58 years) were enrolled in this study. Anthropometric and laboratory parameters (glucose, insulin, lipid, oxytocin, and irisin levels) were analyzed. The serum irisin and oxytocin levels were measured by enzyme-linked immunosorbent assay. Bioelectrical impedance was used to determine body composition. Results: Irisin level was higher in the patients than in the controls (p = 0.018), and this higher irisin level was correlated with increased systolic blood pressure, body mass index, waist/hip ratio, fat percentage, fat mass, glucose level, insulin level, and homeostasis model assessment of insulin resistance. Serum oxytocin level was significantly decreased in obese children compared to the controls (p = 0.049). Also, among the 60 obese patients, oxytocin level was significantly lower in patients with than in those without metabolic syndrome (8.65 +/- 2.69 vs. 10.87 +/- 5.93 ng/L, respectively), while irisin levels were comparable (p = 0.049 and p = 0.104, respectively). There were no statistically significant relationships between oxytocin or irisin levels and lipid levels (p > 0.05). Conclusion: Obese children had significantly higher irisin levels than the healthy controls. Additionally, this study shows for the first time that oxytocin level is significantly lower in obese compared with non-obese children and also lower in obese children with metabolic syndrome compared to those without.