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Effect of long-term injection of high doses of potassium iodide on iodine metabolism in rat thyroid gland

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Abstract

Concentration of thyroid hormones in the serum of the rats after 14-day injections of potassium iodide (1, 3, 10, 100, and 500 physiological daily doses) did not differ from the control values. Excessive administration of potassium iodide increased the total iodide content in the rat thyroid tissue by 60–121% (35–108% and 94–128% for the protein-bound and free iodide, respectively), indicating the activation of the uptake and organification of iodide. The long-term injection of both low and high doses of potassium iodide increased the activity of catalase by 8–18% and SOD by 33–50% and enhanced the level of toxic LPO products reacting with thiobarbituric acid by 15–38%. It is suggested that reactive oxygen species and the excessive iodination of proteins (particularly thyroglobulin) induced by the long-term administration of high doses of potassium iodide can play an important role in the development of thyroid dysfunctions and autoimmune diseases.

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Abbreviations

PDD:

physiological daily dose

TBARS:

thiobarbituric acid-reacting substances

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Authors and Affiliations

  1. Institute of Pharmacology and Biochemistry, National Academy of Sciences of Belarus, ul. BLK-50, Grodno, 230017, Belarus

    S. V. Lupachik, L. I. Nadol’nik, Z. V. Netsetskaya & V. V. Vinogradov

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  1. S. V. Lupachik
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  2. L. I. Nadol’nik
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  3. Z. V. Netsetskaya
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  4. V. V. Vinogradov
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Original Russian Text © S.V. Lupachik, L.I. Nadol’nik*, Z.V. Netsetskaya, V.V. Vinogradov, 2007, published in Biomeditsinskaya Khimiya.

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Lupachik, S.V., Nadol’nik, L.I., Netsetskaya, Z.V. et al. Effect of long-term injection of high doses of potassium iodide on iodine metabolism in rat thyroid gland. Biochem. Moscow Suppl. Ser. B 1, 53–57 (2007). https://doi.org/10.1134/S1990750807010088

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  • DOI: https://doi.org/10.1134/S1990750807010088

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