RESUMO
Objective To study the relationship between serum leptin and thyroid function by investigating the change of serum leptin concentration in children with abnormal thyroid function (hyperthyroidism and hypothyroidism).Methods The levels of serum leptin was determined by radio-immunoassay(RIA) in 20 cases of hyperthyroidism, 17 cases of hypothyroidism, 25 cases of normal controls, respectively .Meanwhile, the serum levels of free triiodothyronine(FT 3), free thyroxine(FT 4) and thyroid-stimulating hormone(TSH) were measured by micro-particle-chemiluminescence immunoassay.Results The levels of serum leptin in hypothyroidism group before treatment was significantly lower than that of normal control groups (P0.05).Conclusions The levels of serum leptin in hypothyroidism markedly descend and no change in the hyperthyroidism. Thyroid hormone can promote the secretion of serum leptin eligibly.
