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Changes in thyroid function after short-term ozone exposure in rats

G K Clemons, J F Garcia

    Journal of Environmental Pathology and Toxicology
    |August 1, 1980
    PubMed
    Summary
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    Ozone exposure significantly suppressed pituitary-thyroid function in male rats, reducing key hormones. This suggests an adaptive response to ozone, potentially aiding tolerance development.

    Area of Science:

    • Environmental toxicology
    • Endocrinology
    • Respiratory medicine

    Background:

    • Ozone is a major air pollutant with known respiratory effects.
    • The impact of ozone on the endocrine system, particularly the pituitary-thyroid axis, is not fully understood.

    Purpose of the Study:

    • To investigate the effects of acute ozone exposure on the pituitary-thyroid axis and prolactin levels in male rats.
    • To explore the potential adaptive mechanisms involved in ozone tolerance.

    Main Methods:

    • Male rats were exposed to 1 ppm ozone for 24 hours.
    • Circulating levels of thyrotropin hormone (TSH), thyroid hormones (T4, T3), and prolactin (PRL) were measured.
    • Pituitary hormone content and in vitro release were assessed.
    • Thyroid weight was determined.

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    Main Results:

    • Ozone exposure significantly reduced circulating TSH, T4, T3, and protein-bound iodine (PBI).
    • Circulating PRL levels were elevated, and pituitary PRL content increased.
    • Pituitary TSH content increased, with enhanced in vitro TSH release.
    • Thyroid weight significantly increased post-exposure.

    Conclusions:

    • Ozone exposure profoundly depresses the pituitary-thyroid axis, possibly as an adaptive mechanism.
    • Elevated prolactin may be linked to reduced hypothalamic inhibition.
    • These hormonal alterations suggest a role in developing ozone tolerance.