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Experimental thyroid autoimmunity in the dog.

D M Haines, W J Penhale

    Veterinary Immunology and Immunopathology
    |July 1, 1985
    PubMed
    Summary
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    Thyroid autoimmunity in dogs can lead to fluctuating autoantibody levels and histopathological damage. High autoantibody titers may indicate thyroid damage, but lower levels may not correlate with functional changes.

    Area of Science:

    • Veterinary Immunology
    • Endocrinology

    Background:

    • Thyroid autoimmunity is a significant concern in canine health.
    • Understanding the relationship between autoantibodies and thyroid pathology is crucial.

    Purpose of the Study:

    • To investigate the development of thyroid autoimmunity in dogs.
    • To correlate autoantibody levels with histopathological changes and thyroid function.

    Main Methods:

    • Induction of thyroid autoimmunity in 6 dogs using thyroid extract and adjuvants.
    • Sequential monitoring of thyroxine levels, autoantibodies (ELISA), and thyroid biopsies for 150 days.

    Main Results:

    • All dogs developed fluctuating thyroid autoantibodies.
    • Four dogs showed histopathological thyroid damage (lymphocytic thyroiditis or granulomatous reaction) during periods of maximal autoantibody titers.

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  • Thyroxine levels decreased in 5 dogs, but only one showed a correlation between low thyroxine and biopsy findings.

    • Conclusions:

    • High levels of thyroid autoantibodies in dogs may suggest underlying histopathological thyroid damage.
    • Lower autoantibody levels may exist without evident histological damage or altered thyroid function.