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Related Experiment Videos

Serum thyroid hormone changes during whole body hyperthermia.

P H Konits, B P Hamilton, E S Pruce

    Cancer
    |December 1, 1984
    PubMed
    Summary

    Acute heat stress significantly alters thyroid hormone metabolism, increasing reverse triiodothyronine (rT3) and decreasing triiodothyronine (T3) in cancer patients undergoing hyperthermia treatment. These changes indicate a stress response and potential heat adaptation.

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    Area of Science:

    • Endocrinology
    • Metabolic Physiology
    • Oncology

    Background:

    • Thyroid hormones (T4, T3, rT3) regulate metabolism and adaptation to environmental temperature.
    • Whole body hyperthermia is used in cancer therapy, potentially impacting endocrine function.
    • Understanding thyroid hormone changes during heat stress is crucial for patient management.

    Purpose of the Study:

    • To investigate the sequential changes in thyroid hormone levels during acute heat stress.
    • To determine the impact of whole body hyperthermia on thyroid hormone metabolism.
    • To explore the relationship between heat stress, thyroid hormones, and adaptation.

    Main Methods:

    • Serum levels of thyroxine (T4), triiodothyronine (T3), and reverse T3 (rT3) were measured sequentially.

    Related Experiment Videos

  • 5 cancer patients undergoing whole body hyperthermia (37°C to 42°C) were studied.
  • Thyrotropin levels were measured in two patients.

    • Main Results:

    • Severe hyperthermia caused a fivefold increase in rT3 and a 50% decrease in T3 levels.
    • T4 and free T4 levels showed a slight increase; thyrotropin remained unchanged.
    • Hormonal changes were evident by 4 hours, peaked at 24-48 hours, and persisted for days.

    Conclusions:

    • Reciprocal changes in T3 and rT3 indicate a stress response and potential adaptation to heat by suppressing thermogenic T3.
    • Short-duration hyperthermia profoundly alters peripheral thyroxine degradation, with lasting effects.
    • Hyperthermia-induced thyroid hormone changes require consideration in patient management and offer a model for heat stress adaptation studies.