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Related Experiment Videos

Altered epithelial lining fluid parameters in old normal individuals.

A B Thompson1, S G Scholer, D M Daughton

  • 1University of Nebraska Medical Center, Omaha 68198-5300.

Journal of Gerontology
|September 1, 1992
PubMed
Summary
This summary is machine-generated.

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Aging lungs show increased neutrophils and IgG in bronchoalveolar lavage fluid, potentially impacting defenses against pneumonia in older adults. This study examined age-related lung changes.

Area of Science:

  • Immunology
  • Gerontology
  • Pulmonology

Background:

  • Pneumonia is a significant cause of illness and death in the elderly.
  • Immunosenescence, or age-related immune system decline, is thought to increase susceptibility to infections like pneumonia.
  • The study investigates age-related alterations on lung epithelial surfaces.

Purpose of the Study:

  • To investigate age-related changes in the lung's epithelial surfaces.
  • To analyze bronchoalveolar lavage (BAL) fluid in different age groups.
  • To assess local host defense mechanisms in the aging lung.

Main Methods:

  • Bronchoscopy and bronchoalveolar lavage (BAL) were performed on young, middle-aged, and old healthy, non-smoking subjects.
  • BAL fluid was collected from bronchial and distal lung samples.

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  • Lavage fluid cellularity, IgA, IgG, and albumin levels were measured using ELISA.

    • Main Results:

    • Lower lavage fluid returns were observed in the elderly group, correlating with spirometry results.
    • Significantly elevated neutrophils were found in bronchial samples from older subjects.
    • Elevated IgG levels were detected in both bronchial and distal samples from the elderly, while IgA and albumin levels did not differ consistently.

    Conclusions:

    • Aging is associated with specific changes in bronchoalveolar lavage fluid composition.
    • Increased neutrophils and IgG in the aging lung may indicate altered local host defenses.
    • These findings contribute to understanding the increased susceptibility to pneumonia in older individuals.