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Intercellular adhesion molecule-1 and L-selectin regulate bleomycin-induced lung fibrosis
Yasuhito Hamaguchi1, Yoriko Nishizawa, Masahide Yasui
1Department of Dermatology, Kanazawa University Graduate School of Medical Science, Ishikawa, Japan.
The American Journal of Pathology
|November 5, 2002
Summary
This study reveals that L-selectin and ICAM-1 are crucial for pulmonary fibrosis development by enabling inflammatory cell infiltration. Inhibiting these adhesion molecules significantly reduces lung fibrosis and collagen deposition.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cell Biology
Background:
- Pulmonary fibrosis, such as bleomycin-induced lung injury, involves inflammatory cell infiltration.
- The specific adhesion molecules regulating this fibrotic process are not well understood.
Purpose of the Study:
- To investigate the roles of L-selectin and intercellular adhesion molecule-1 (ICAM-1) in bleomycin-induced pulmonary fibrosis.
- To determine if targeting these adhesion molecules can mitigate fibrotic development.
Main Methods:
- Utilized genetically modified mice lacking L-selectin, ICAM-1, or both.
- Administered intratracheal bleomycin to induce lung injury and fibrosis.
- Quantified collagen deposition, leukocyte infiltration, and gene expression of cytokines and TGF-beta1.
Main Results:
- L-selectin(-/-) and ICAM-1(-/-) mice showed reduced collagen deposition compared to wild-type.
- Combined deficiency of L-selectin and ICAM-1 nearly eliminated collagen deposition.
- Fibrosis reduction correlated with decreased leukocyte accumulation and lower mRNA levels of proinflammatory cytokines and TGF-beta1.
Conclusions:
- L-selectin and ICAM-1 are critical mediators of leukocyte accumulation in pulmonary fibrosis.
- These adhesion molecules regulate the production of key fibrotic factors like TGF-beta1.
- Targeting L-selectin and ICAM-1 presents a potential therapeutic strategy for pulmonary fibrosis.