[Studies on the T-cell subset in lung tissue and BALF from patients with interstitial pneumonia]
1Second Department of Medicine, Okayama University Medical School.
Insights
Analyzing T-cell subsets in bronchoalveolar lavage fluid (BALF) and lung tissue from patients with interstitial pneumonia reveals a strong correlation. These findings suggest BALF analysis can effectively monitor lung tissue changes in diffuse pulmonary diseases.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cell Biology
Context:
- Bronchoalveolar lavage fluid (BALF) analysis is crucial for understanding cellular kinetics in diffuse pulmonary diseases.
- Increased lymphocyte percentages in BALF are observed in various interstitial pneumonias.
- T-cell subset analysis in BALF and lung tissue provides insights into interstitial lung diseases.
Purpose:
- To compare CD4/CD8 T-cell ratios in BALF and lung tissues of patients with hypersensitivity pneumonitis (HP), sarcoidosis (Sar), idiopathic interstitial pneumonia (IIP), and rheumatoid arthritis with interstitial pneumonia (RA+IP).
- To determine if BALF cellular component changes reflect alterations in lung tissues.
Summary:
- The study analyzed T-cell subsets (CD4/CD8 ratios) in BALF and lung tissues from patients with HP, Sar, IIP, and RA+IP.
- Mean CD4/CD8 ratios in BALF were 0.36 (HP), 3.1 (Sar), 1.07 (IIP), and 2.59 (RA+IP).
- Mean CD4/CD8 ratios in lung tissues were 0.52 (HP), 2.59 (Sar), 1.11 (IIP), and 2.25 (RA+IP), showing a positive correlation with BALF ratios.
Impact:
- Demonstrates a positive correlation between CD4/CD8 ratios in BALF and lung tissues across different interstitial pneumonias.
- Suggests that BALF analysis can serve as a reliable indicator of cellular changes within lung tissues.
- Highlights the potential of BALF T-cell subset analysis for diagnosing and monitoring interstitial lung diseases.
Abstract:
The cellular components in bronchoalveolar lavage fluids (BALF) have been analyzed to obtain information on cellular kinetics in lung tissues of patients with diffuse pulmonary diseases. While various cells, alveolar macrophages, lymphocytes, and granulocytes appear in BALF, an increase in the percentage of lymphocytes has been noted in a variety of interstitial pneumonia. The T-cell subset of lymphocytes in BALF and biopsied lung tissues was, therefore, examined in patients with hypersensitivity pneumonitis (HP), sarcoidosis (Sar), idiopathic interstitial pneumonia (IIP) and rheumatoid arthritis with interstitial pneumonia (RA+IP) to compare the ratios of CD4/CD8 in BALF and lung tissues. The T-cell subset in BALF was analyzed by flow cytometry and the T-cell subset in lung tissues was detected with fresh frozen and thin-sliced specimens using an avidine-biotin complex (ABC) kit (Vecta Co. Ltd). The mean CD4/CD8 ratio in BALF was 0.36 in HP, 3.1 in Sar, 1.07 in IIP and 2.59 in RA+IP, while the mean CD4/CD8 ratio in lung tissues was 0.52 in HP, 2.59 in Sar, 1.11 in IIP and 2.25 in RA+IP, respectively. The ratios of CD4/CD8 in BALF and lung tissues from patients with these various interstitial pneumonia showed a positive correlation indicating that the changes of cellular components in BALF would reflect the changes in the lung tissues. Furthermore, CD4/CD8 ratios of lymphocytes infiltrating the alveolar portion and granuloma in lung tissues of HP were analyzed separately, because the CD4/CD8 ratios varied considerably from part to part of the lung tissues.(ABSTRACT TRUNCATED AT 250 WORDS)
