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NK cell activity in pulmonary tuberculosis.

T Yoneda, M Kasai, J Ishibashi

    British Journal of Diseases of the Chest
    |April 1, 1983
    PubMed
    Summary
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    Natural killer (NK) cell activity is significantly elevated in patients with active pulmonary tuberculosis compared to healthy individuals. This immune response suggests a role for NK cells in tuberculosis defense mechanisms.

    Area of Science:

    • Immunology
    • Infectious Diseases
    • Cellular Biology

    Background:

    • Natural killer (NK) cells are crucial components of the innate immune system, involved in immune surveillance against pathogens and cancer.
    • Pulmonary tuberculosis (TB), caused by Mycobacterium tuberculosis, remains a significant global health challenge, necessitating a deeper understanding of host immune responses.
    • Dysregulation of immune cell activity, including NK cells, is often observed in active infectious diseases.

    Purpose of the Study:

    • To investigate and compare natural killer (NK) cell activity in patients with active pulmonary tuberculosis versus healthy controls.
    • To explore potential correlations between NK cell activity levels and the clinical status of pulmonary tuberculosis, including disease progression and treatment response.

    Main Methods:

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  • The study involved 38 patients diagnosed with active pulmonary tuberculosis and 54 sex- and age-matched healthy controls.
  • Natural killer (NK) cell activity was quantified and compared between the patient cohort and the control group.
  • Patients with tuberculosis were further categorized based on the excretion status of tubercle bacilli to analyze NK cell activity in different disease stages.

    • Main Results:

    • Mean NK cell activity was significantly higher in patients with active pulmonary tuberculosis (58.7 +/- 26.4%) compared to healthy controls (17.4 +/- 12.2%) (P < 0.001).
    • Among tuberculosis patients, mean NK cell activity was 43.2 +/- 20.7% in newly diagnosed cases, 59.4 +/- 30.3% in advanced disease, and 71.9 +/- 25.9% in successfully treated patients.
    • A trend towards increased NK cell activity was observed with disease progression, although the highest activity was noted in successfully treated patients.

    Conclusions:

    • Active pulmonary tuberculosis is associated with significantly enhanced natural killer (NK) cell activity.
    • NK cell activity may play a role in the immune defense against tuberculosis, potentially influencing disease outcomes.
    • Further research is warranted to elucidate the precise mechanisms and clinical implications of altered NK cell function in tuberculosis.