ABSTRACT
Leptin, adiponectin and resistin, mainly produced by adipocytes, play a major role in body weight regulation. Disturbances in the maintenance of normal body weight are found to occur also in thyroid diseases. There is a close relationship of the changes in thyroid hormones with the contents of adipose tissue and adipocyte-secreted proteins regulating energetic metabolism in the body. The study objective was to analyze the levels of leptin, adiponectin and resistin in children with untreated Graves' disease, subclinical hypothyroidism in Hashimoto's thyroiditis and in children with simple goiter. The study involved 78 patients with Graves' disease (29 girls and 2 boys, aged 6-21 years, mean 15.2) and with Hashimoto's thyroiditis (30 girls and 2 boys, aged 9-18 years, mean 14.5). The control group consisted of adolescents with simple goiter (13 girls and 2 boys, aged 9-18 years, mean 14.8). The levels of leptin, adiponectin and resistin were determined using the ELISA method (R&D System, USA). Patients with untreated Graves' disease showed higher adiponectin level than the subjects with hypothyroidism in Hashimoto's thyroiditis and in simple goiter (14.24±0.89 vs. 9.18±2.65, 10.15±2.5, p<0.007, p<0.01), but lower resistin level as compared to simple goiter and Hashimoto's thyroiditis (10.24±5.2 vs. 13.29±3.8, 12.2±2.8, p<0.01, NS). The analysis of leptin levels revealed no significant differences between children with subclinical hypothyroidism and untreated Graves' disease (4.42±0.87 vs. 3.1±0.45 NS). In conclusion, we suggest that disturbances in thyroid hormones in thyroid diseases have an essential effect on the levels of adiponectin and resistin released by adipose tissue.
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