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Related Experiment Videos

The function of glucocorticoids in thermogenesis.

D R Deavers, X J Musacchia

    Federation Proceedings
    |July 1, 1979
    PubMed
    Summary

    Glucocorticoids are essential for preventing heat loss and maintaining thermogenesis in cold conditions. Studies show these hormones enhance survival by improving metabolic responses and carbohydrate reserves during hypothermia.

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    Area of Science:

    • Endocrinology
    • Physiology
    • Metabolism

    Background:

    • Glucocorticoids play a role in thermogenesis and heat loss prevention.
    • Their effects are often permissive, supporting other physiological processes.

    Purpose of the Study:

    • To investigate the role of glucocorticoids in thermoregulation and cold adaptation.
    • To understand how glucocorticoids influence metabolic responses during hypothermia.

    Main Methods:

    • In vivo and in vitro studies were conducted.
    • Experiments involved adrenalectomized, cold-exposed rats and hypothermic hamsters.

    Main Results:

    • Glucocorticoids are required for catecholamine-mediated responses in cold-exposed rats, including fatty acid mobilization, shivering, vasoconstriction, and piloerection.
    • Glucocorticoid pretreatment enabled hypothermic hamsters to arouse from 8°C to normothermia in a cold environment.
    • Enhanced lipolytic, gluconeogenic, and glycogenolic actions were observed in glucocorticoid-pretreated hamsters.
    • Glucocorticoid treatment increased blood and liver carbohydrate levels during hypothermia, mimicking hibernating animals.

    Conclusions:

    • Glucocorticoids are critical for effective thermogenesis and survival during cold exposure and hypothermia.
    • These hormones enhance metabolic flexibility and carbohydrate availability, crucial for arousal and adaptation to cold environments.

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