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Effects of zinc deficiency on thyroid function.

J W Oliver, D S Sachan, P Su

    Drug-Nutrient Interactions
    |January 1, 1987
    PubMed
    Summary
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    Zinc deficiency enhances liver enzyme activity involved in thyroid hormone activation. This interaction may be crucial for individuals with thyroid dysfunction, impacting thyroid hormone metabolism.

    Area of Science:

    • Endocrinology
    • Nutritional Science
    • Biochemistry

    Background:

    • Thyroid hormones regulate metabolism and growth.
    • Zinc is essential for numerous enzymatic functions, including those in the liver.

    Purpose of the Study:

    • To investigate the pathophysiological effects of combined zinc deficiency and altered thyroid states in rats.
    • To assess how zinc status influences thyroid hormone metabolism and enzyme activity.

    Main Methods:

    • Rats were subjected to conditions of zinc deficiency and/or thyroid alteration (thiouracil treatment).
    • Measurements included growth rate, organ/glandular weights, serum thyrotropin, hepatic thyroxine-5'-monodeiodinase activity, microsomal-monooxygenase activity, nicotinamide-adenine dinucleotide phosphate cytochrome c reductase activity, and cytochrome P-450 content.

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    Main Results:

    • Zinc deficiency alone primarily affected growth rate but enhanced hepatic thyroxine-5'-monodeiodinase activity.
    • Zinc deficiency protected against thiouracil-induced suppression of the microsomal-monooxygenase and thyroxine-5'-monodeiodinase enzyme complex.
    • Zinc-deficient rats exhibited increased triiodothyronine generation capacity due to enhanced enzyme activity.

    Conclusions:

    • Concurrent zinc deficiency and altered thyroid status modify thyroid hormone response and disposition.
    • Enhanced hepatic thyroxine-5'-monodeiodinase activity in zinc deficiency increases the potential for generating biologically active triiodothyronine.
    • Findings are significant for populations at risk of thyroid dysfunction where zinc status may play a modulatory role.