Dynamic changes of orexin A and leptin in obese chldren during body weight reduction

Studie věnovaná problematice kolísání orexinu A a leptinu při procesu hubnutí obézních dětí.

In this study, we describe changes of plasma levels of the hypothalamic neuropeptide orexin A in obese children during the reduction of body weight and its relationship to other biochemical and anthropometrical parameters. We measured orexin A fasting plasma levels by the RIA method in 58 obese children - 33 girls and 25 boys; mean age 13.1±0.38 years (range 7-18.5) before and after 5 weeks of weight-reduction therapy. Leptin, IGF-1, and IGFBP-3 levels were measured in all the subjects and were compared to orexin A levels and anthropometrical data. Average weight in subjects before weight-reduction was 74.2±2.79 kg and after weight-loss 67.4±2.60 kg (p<0.0001). Orexin A levels before the therapy were 33.3±1.97 pg/ml and after the therapy 51.7±3.07 pg/ml (p<0.0001). Levels of orexin A were not significantly different between girls and boys (p=0.7842). We found negative correlation between orexin A and age (r= -0.5395; p<0.0001), body height (r= -0.4751; p=0.0002), body weight (r= -0.4030; p=0.0017) and BMI (r= -0.2607; p=0.0481). No correlation was found between orexin A and IGF-1, IGFBP-3 or leptin. Orexin A plasma levels increased during body weight loss, whereas the reverse was true for leptin levels. These findings support the hypothesis that orexin A may be involved in regulation of nutritional status in children.

Bronský, Jiří et al. Dynamic changes of orexin A and leptin in obese chldren during body weight reduction. Physiological research, 2007, 56(1), s. 89-96. ISSN 0862-8408.