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Related Experiment Videos

Altered cellular immune function in the atelectatic lung.

D M Nguyen1, D S Mulder, H Shennib

  • 1McGill University Lung Transplant Program, Montreal, Quebec, Canada.

The Annals of Thoracic Surgery
|January 1, 1991
PubMed
Summary
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Pulmonary atelectasis impairs local lung immune cells, increasing infection risk. However, it boosts cytotoxic lymphocytes in the blood, suggesting a complex immune response to lung collapse.

Area of Science:

  • Immunology
  • Pulmonary Medicine
  • Cellular Biology

Background:

  • Pulmonary atelectasis is a common condition that can lead to lung infections.
  • Previous research indicates atelectasis impairs alveolar macrophage antibacterial function.
  • The impact of atelectasis on lymphocyte cytotoxic function within the lung remains less understood.

Purpose of the Study:

  • To investigate the effect of atelectasis on the cytotoxic function of lymphocytes in the bronchoalveolar space.
  • To compare the function of lymphocytes from atelectatic lung segments with those from unaffected contralateral lung segments and peripheral blood.

Main Methods:

  • Studied natural killer (NK) and lectin-dependent cell-mediated cytotoxicity (LDCC) in lymphocytes.
  • Collected samples via bronchoalveolar lavage from atelectatic and normal lung lobes in 8 dogs.

Related Experiment Videos

  • Analyzed peripheral blood lymphocytes concurrently.

    • Main Results:

    • Atelectasis significantly reduced NK and LDCC activity in bronchoalveolar lavage lymphocytes (to 62.7% and 61.5% of control, respectively).
    • Lymphocyte cytotoxic function in unaffected contralateral lung lobes remained comparable to control values.
    • Peripheral blood lymphocyte NK and LDCC activities increased significantly (to 166.7% and 154.7% of control, respectively) in dogs with atelectasis.

    Conclusions:

    • Atelectasis impairs local bronchoalveolar lymphocyte cytotoxic function, potentially increasing susceptibility to infection.
    • The findings confirm the presence and role of cytotoxic lymphocytes in the bronchoalveolar compartment.
    • The contrasting effects on local lung versus systemic lymphocytes highlight a complex immune response to atelectasis.