Related Experiment Videos
[Cytokine gene expression in interstitial lung diseases]
K Konishi1, T Nakadate, K Sugawara
1Third Department of Internal Medicine, Iwate Medical University.
Nihon Kyobu Shikkan Gakkai Zasshi
|August 1, 1992
Summary
Macrophages in pulmonary fibrosis express key cytokines. Transforming growth factor-alpha (TGF-α) and tumor necrosis factor-alpha (TNF-α) mRNA were detected in patients and animal models, suggesting their role in lung fibrosis.
Area of Science:
- Immunology
- Pulmonary Medicine
- Molecular Biology
Background:
- Macrophages play a critical role in the pathogenesis of pulmonary fibrosis.
- Cytokines produced by macrophages are implicated in fibrotic processes.
- Transforming growth factor-alpha (TGF-α) is known to stimulate fibroblast and endothelial cell proliferation.
Purpose of the Study:
- To investigate the gene expression of TGF-α and TNF-α in alveolar macrophages from patients with idiopathic pulmonary fibrosis (IPF) and in a rat model of bleomycin-induced alveolitis.
- To determine the potential role of these cytokines in the development of lung fibrosis.
Main Methods:
- Alveolar macrophages were obtained by bronchoalveolar lavage (BAL) from IPF patients and healthy volunteers.
- A rat model of bleomycin-induced alveolitis was used.
- Total RNA was extracted, and gene expression of TGF-α and TNF-α mRNA was analyzed using Northern analysis.
Main Results:
- TGF-α mRNA was undetectable in alveolar macrophages from healthy volunteers but significantly detected in those from IPF patients.
- TNF-α mRNA was significantly expressed in alveolar macrophages from bleomycin-treated rats.
- Both TGF-α and TNF-α exhibit fibroblast proliferative activity.
Conclusions:
- Alveolar macrophages from IPF patients and bleomycin-induced alveolitis models express TGF-α and TNF-α, respectively.
- These cytokines may play a significant role in the pathogenesis of pulmonary fibrosis.
- Targeting these macrophage-derived cytokines could be a therapeutic strategy for lung fibrosis.