Background: Copeptin and nesfatin-1 have recently been identified as novel peptides that play a role in the pathogenesis of obesity-related insulin resistance in adults. However, the relationship between them has not yet been elucidated, and their circulating levels in children with obesity have not been adequately studied. Therefore, the current study aimed to investigate whether their levels are altered in Chinese children with obesity, as well as to determine the correlation of these 2 peptides with each other, with insulin resistance, and with other biochemical parameters.
Methods: A total of 156 children were enrolled in this study, including 101 children with obesity and 55 lean controls. Anthropometric parameters and clinical data of all subjects were collected, and circulating tumor necrosis factor-α, adiponectin, leptin, copeptin, and nesfatin-1 levels were measured using ELISA.
Results: Serum copeptin and nesfatin-1 levels were significantly elevated in children with obesity and children with insulin resistance compared to control subjects. In addition, nesfatin-1 and copeptin levels were found to be significantly positively correlated with one another by Pearson's correlation and partial correlation. In multiple regression analysis using nesfatin-1 or copeptin as the dependent parameter, a significant correlation was observed between nesfatin-1 and copeptin, and associations between each of them with homeostasis model assessment of insulin resistance (HOMA-IR) were detected.
Conclusion: These novel findings shed light on the possible interplay role of these 2 molecules in obesity-related insulin resistance.
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