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Lung lymphocytes in bleomycin-induced pulmonary disease
J P Karpel1, T K Aldrich, S Mitsudo
1Department of Medicine, Montefiore Medical Center, North Central Bronx Hospital Center, Albert Einstein College of Medicine, Bronx, New York 10467.
Lung
|January 1, 1989
Summary
Cell-mediated immunity plays a role in bleomycin-induced lung injury. Stimulated T lymphocytes, specifically from bronchoalveolar lavage, show increased activity in bleomycin-treated rabbits, indicating their involvement in lung inflammation.
Area of Science:
- Immunology
- Pulmonary Medicine
- Toxicology
Background:
- The precise role of cell-mediated immunity in bleomycin-induced lung injury remains unclear.
- Bleomycin is a chemotherapeutic agent known to cause pulmonary fibrosis.
Purpose of the Study:
- To investigate the functional activity of T lymphocytes in bleomycin-induced lung injury.
- To assess T lymphocyte proliferation and cytotoxicity in response to bleomycin exposure.
Main Methods:
- Rabbits were treated with bleomycin, and lung tissue, bronchoalveolar lavage (BAL) fluid, and blood were collected.
- T lymphocyte function was evaluated using cell proliferation and concanavalin-A-dependent cell-mediated cytotoxicity (CDCMC) assays.
- Interleukin-2 (IL-2) was used to stimulate lymphocyte activity.
Main Results:
- Histological examination revealed mononuclear cell infiltrates in the lungs of bleomycin-treated rabbits.
- Elevated percentages of lymphocytes and neutrophils were observed in BAL fluid from treated animals.
- IL-2 stimulated BAL lymphocytes from bleomycin-treated rabbits exhibited a significantly greater proliferative response and CDCMC activity compared to controls.
Conclusions:
- Stimulated T lymphocytes are present in the lungs of rabbits 4 days after bleomycin exposure.
- These findings suggest that cell-mediated immunity contributes to bleomycin-induced lung injury.