Interleukin 15 (IL-15) plays a key role in the muscle-fat interaction, reducing adipose tissue mass without changes in the lean body mass and reduction of food intake. Here we assess serum IL-15 levels in girls with anorexia nervosa (AN) relative to obese and normal weight female adolescents. Serum IL-15 concentrations were evaluated using a commercially available ELISA kit in 32 Polish girls with restrictive AN, 29 girls with obesity (O), and 21 healthy controls (C). Anthropometric measurements (weight, height, BMI) and laboratory assays (serum fasting glucose, insulin, HOMA-IR, total cholesterol, HDL, LDL, triglycerides, and C-reactive protein (CRP)) were performed. Mean serum IL-15 in the AN group was significantly higher than in C, but lower than in O. In all examined girls, significant positive correlations between IL-15 and body weight, BMI, insulin, HOMA, LDL, triglycerides and CRP were noted. We also observed an inverse relationship between IL-15 and HDL. Our study demonstrated that serum IL-15 concentrations in adolescent girls with AN and obesity are significantly elevated in comparison to normal weight controls. However, the role of IL-15 in the pathogenesis of AN and obesity remains still unclear.
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