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[Deiodase activity in hypothyroid rats].

C Voss, N Hartmann, L Ratzmann

    Acta Biologica Et Medica Germanica
    |January 1, 1975
    PubMed
    Summary
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    Hypothyroidism significantly reduces liver and kidney deiodination of L-diiodotyrosine (L-DIT) and L-thyroxine (L-T4) in rats. Methylthiouracil and methimazol showed no difference in deiodination extent compared to radiothyroidectomy.

    Area of Science:

    • Endocrinology
    • Biochemistry
    • Toxicology

    Context:

    • Thyroid hormone metabolism is crucial for physiological regulation.
    • Hypothyroidism, induced by various agents, impacts thyroid hormone deiodination.
    • Investigating deiodination in liver and kidney provides insight into thyroid hormone processing.

    Purpose:

    • To compare the deiodination activity of L-diiodotyrosine (L-DIT) and L-thyroxine (L-T4) in rat liver and kidney homogenates across different hypothyroidism models.
    • To determine the impact of methylthiouracil (MTU), methimazol (MMI), and radiothyroidectomy on thyroid hormone deiodination.
    • To assess differences in deiodination capacity between liver and kidney tissues.

    Summary:

    • Hypothyroid rats (induced by MTU, MMI, or radiothyroidectomy) exhibited significantly reduced liver deiodination of L-DIT and L-T4 compared to controls.

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  • Kidney deiodination of L-DIT was significantly reduced in all hypothyroid groups, while L-T4 deiodination was reduced by MTU and MMI but not radiothyroidectomy.
  • Liver deiodination activity was twice that of the kidney for both L-DIT and L-T4, with the kidney showing only 25% of the liver's activity.

    • Impact:

    • Findings reveal that hypothyroidism significantly impairs thyroid hormone deiodination in key metabolic organs.
    • The study highlights similarities in deiodination effects between MTU and MMI, differentiating them from radiothyroidectomy in kidney L-T4 deiodination.
    • This research contributes to understanding the biochemical consequences of thyroid dysfunction and the role of specific organs in hormone metabolism.