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Related Experiment Videos

Polymorphonuclear leucocyte function in hypothyroidism.

N R Farid, G Woodford, B Au

    Hormone Research
    |January 1, 1976
    PubMed
    Summary
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    Hypothyroidism impairs polymorphonuclear leucocytes' dye reduction, a key immune function. This nitroblue-tetrazolium (NBT) test abnormality in thyroid patients was reversed with thyroxine treatment, indicating immune system recovery.

    Area of Science:

    • Immunology
    • Endocrinology
    • Cellular Biology

    Background:

    • Hypothyroidism is a condition characterized by insufficient thyroid hormone production.
    • Polymorphonuclear leucocytes (PMNs) play a crucial role in the innate immune system.
    • The nitroblue-tetrazolium (NBT) test is a functional assay assessing the oxidative burst activity of phagocytes.

    Purpose of the Study:

    • To investigate the functional capacity of polymorphonuclear leucocytes (PMNs) in patients with hypothyroidism.
    • To evaluate the impact of hypothyroidism on the nitroblue-tetrazolium (NBT) test results.
    • To determine if thyroxine replacement therapy can correct any observed NBT test abnormalities.

    Main Methods:

    • Quantitative nitroblue-tetrazolium (NBT) test was performed on polymorphonuclear leucocytes (PMNs) from hypothyroid patients and euthyroid controls.

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  • Phagocytic and bactericidal activity against staphylococci was assessed in the PMNs.
  • NBT test was repeated after treatment with thyroxine in hypothyroid patients.

    • Main Results:

    • Polymorphonuclear leucocytes (PMNs) from hypothyroid patients exhibited reduced nitroblue-tetrazolium (NBT) dye reduction compared to euthyroid individuals.
    • The phagocytic and bactericidal capabilities of these PMNs remained unaffected by hypothyroidism.
    • Thyroxine treatment successfully normalized the NBT test results in the hypothyroid patients.

    Conclusions:

    • Hypothyroidism is associated with an impaired oxidative burst capacity in polymorphonuclear leucocytes (PMNs), as indicated by the NBT test.
    • This functional defect in PMNs does not compromise their ability to ingest or kill staphylococci.
    • Thyroxine replacement therapy effectively restores the normal NBT test performance, suggesting a direct role of thyroid hormones in regulating PMN oxidative metabolism.