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From the Departments of Dermatology* and Hemato-oncology and Respiratory Medicine,
Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan; and the Department of Immunology,
Duke University Medical Center, Durham, North Carolina
The development of bleomycin-induced lung injury, a model of pulmonary fibrosis, results from inflammatory cell infiltration, a process highly regulated by the expression of multiple adhesion molecules. At present, the identity and role of the adhesion molecules involved in the fibrotic process are unknown. Therefore, bleomycin-induced pulmonary fibrosis was examined in mice lacking L-selectin (L-selectin-/-) expression, intercellular adhesion molecule-1 (ICAM-1) expression, or both. After 16 days of intratracheal bleomycin challenge, collagen deposition was inhibited in both L-selectin-/- and ICAM-1-/- mice when compared with wild-type littermates. Interestingly, collagen deposition was virtually eliminated in L-selectin/ICAM-1-/- mice relative to either the L-selectin-/- or ICAM-1-/- mice. Decreased pulmonary fibrosis was associated with reduced accumulation of leukocytes, including neutrophils and lymphocytes. Decreased mRNA expression of proinflammatory cytokines and transforming growth factor (TGF)-ß1 paralleled the inhibition of collagen deposition. The present study indicates that L-selectin and ICAM-1 play a critical role in pulmonary fibrosis by mediating the accumulation of leukocytes, which regulate the production of proinflammatory cytokines and TGF-ß1. This suggests that these adhesion molecules are potential therapeutic targets for inhibiting human pulmonary fibrosis.
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