Abstract
Thyroid diseases rank second among endocrine disorders, and prevalence of the diseases is higher in the elderly as compared to the younger population. An excess or deficiency of trace element contents in thyroid play important role in goitro- and carcinogenesis of gland. The correlations with age of the seven-trace element (TE) contents (Br, Cu, Fe, I, Rb, Sr, and Zn), I/Br, I/Cu, I/Fe, I/Rb, I/Sr, and I/Zn ratios, and inter relationships between TE contents and I/TE content ratios in normal thyroid of 73 males (mean age 37.3 years, range 2.0-80) was investigated by radionuclide-induced energy dispersive X-ray fluorescent analysis. Our data reveal that the I content and the I/Fe ratio increase in the normal thyroid of male during a lifespan. Therefore, a goitrogenic and tumorigenic effect of excessive I level in the thyroid of old males and of disturbance in intrathyroidal I/Fe relationships with increasing age may be assumed. Furthermore, it was found that the levels of Br, Cu, Rb, and Zn in the thyroid gland are interconnected and depend on the content of I in it. Because I plays a decisive role in the function of the thyroid gland, the data obtained allow us to conclude that, along with I, such TEs as Br, Cu, Rb, and Zn, if not directly, then indirectly, are involved in the process of thyroid hormone synthesis.
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