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  • Title: Iodine metabolism in response to goitrogen induced altered thyroid status under conditions of moderate and high intake of iodine.
    Author: Lakshmy R, Rao PS, Sesikeran B, Suryaprakash P.
    Journal: Horm Metab Res; 1995 Oct; 27(10):450-4. PubMed ID: 8575723.
    Abstract:
    Metabolic experiments in rats were undertaken to relate excretory pattern of iodine and thiocyanate, with thyroid weight and the circulating levels of thyroxine, in response to moderate and high intake of iodine and under conditions of goitrogen induced altered thyroid status. On a moderate intake of iodine (by depriving diet of KI) 25 mg of thiocyanate or substitution of 1/3rd proportion of casein based diet with dry cabbage, could significantly reduce plasma thyroxine level by 60 days. Neither body weight nor the weights of liver, kidney, heart or spleen were affected due to exposure to goitrogens. A significant increase in thyroid weight as well as higher excretion of iodine and thiocyanate were evident in goitrogen-fed rats. Presence of high amounts of KI, to a certain extent, offered protection from adverse effects of the goitrogens. Semi quantitative assessment of thyroid, indicated hypofunctioning of thyroid with follicular hyperplasia in thiocyanate fed rats. These alterations were of moderate degree in response to cabbage feeding. These results emphasize that, moderate intake of iodine, adequate to meet iodine requirement, may not ensure normal functioning of thyroid in the presence of goitrogens.
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