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Emerging evidence has indicated that insulin-like growth factor binding protein-2 (IGFBP-2) may be involved in the development of obesity and insulin resistance like IGFBP-1.  The aim of this study was to measure serum IGFBP-2 levels in overweight and obese children and to compare these levels with those of controls.  We also analyzed the associations between IGFBP-2 and insulin sensitivity indices and cardiovascular risk factors.  134 Korean children including 55 overweight and 59 obese subjects were enrolled.  We measured anthropometric values and determined fasting serum levels of IGFBP-2, glucose, insulin, lipid profiles, and insulin sensitivity indices including the homeostatic model assessment of insulin resistance (HOMA-IR) and the Quantitative Insulin Sensitivity Check Index (QUICKI).  The subjects were subgrouped based on body mass index (BMI) and pubertal stage, and association analyses between IGFBP-2 levels and measured factors were performed in each group.  Serum IGFBP-2 levels in overweight or obese children were significantly lower than those of controls regardless of pubertal development.  Serum IGFBP-2 levels were negatively correlated with weight, BMI, waist circumference, fasting insulin levels, and HOMA-IR but were positively correlated with QUICKI.  The associations were stronger in pubertal children than those in prepubertal children.  However, no association was observed between serum IGFBP-2 levels and auxological or metabolic parameters in children with normal BMIs.  These results suggested that IGFBP-2 might be a promising marker for early recognition of insulin resistance, particularly in overweight or obese children, regardless of pubertal stage.

Association between insulin-like growth factor binding protein-2 levels and cardiovascular risk factors in Korean children