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Adrenocortical function in rats chronically exposed to high altitude.

L C Ou, S M Tenney

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |December 1, 1979
    PubMed
    Summary

    Rats exposed to high altitude showed enlarged pituitary and adrenal glands, with significantly increased corticosterone levels. However, their adrenal glands maintained normal responsiveness to ACTH stimulation.

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    Area of Science:

    • Endocrinology
    • Altitude Physiology
    • Stress Response

    Background:

    • High altitude exposure is known to trigger physiological adaptations.
    • The hypothalamic-pituitary-adrenal (HPA) axis plays a crucial role in stress response and adaptation.

    Purpose of the Study:

    • To investigate the effects of chronic simulated high altitude on the rat pituitary and adrenal glands.
    • To assess changes in corticosterone production and adrenal responsiveness to ACTH.

    Main Methods:

    • Rats were exposed to simulated altitude (5,486 m) for 3 months.
    • Plasma corticosterone levels were measured.
    • In vitro corticosterone production by adrenal glands was assessed.
    • Adrenal responsiveness to ACTH was evaluated.

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    Main Results:

    • Simulated high altitude led to significant hypertrophy of pituitary and adrenal glands.
    • Plasma corticosterone levels increased more than threefold compared to sea-level controls.
    • In vitro adrenal corticosterone production rates were enhanced, but ACTH responsiveness remained normal.

    Conclusions:

    • Chronic simulated high altitude induces HPA axis alterations in rats, characterized by gland hypertrophy and increased basal corticosterone production.
    • The adrenal glands adapt to high altitude by increasing production capacity, not by altering sensitivity to ACTH.