Journal
RESPIRATORY RESEARCH
Volume 12, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/1465-9921-12-131
Keywords
cluster of differentiation 69; lung inflammation; pulmonary fibrosis; bleomycin
Categories
Funding
- Ministry of Education, Science, Sports and Culture of Japan [21390172]
- Ministry of Health, Labour and Welfare, Japan
- Grants-in-Aid for Scientific Research [21390172, 23659240, 22790452, 23659280, 21390147] Funding Source: KAKEN
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Background: Cluster of differentiation 69 (CD69), an early activation marker antigen on T and B cells, is also expressed on activated macrophages and neutrophils, suggesting that CD69 may play a role in inflammatory diseases. To determine the effect of CD69 deficiency on bleomycin(BLM)-induced lung injury, we evaluated the inflammatory response following intratracheal BLM administration and the subsequent fibrotic changes in wild type (WT) and CD69 deficient (CD69(-/-)) mice. Methods: The mice received a single dose of 3 mg/kg body weight of BLM and were sacrificed at 7 or 14 days post-instillation (dpi). Lung inflammation in the acute phase (7 dpi) was investigated by differential cell counts and cytokine array analyses of bronchoalveolar lavage fluid. In addition, lung fibrotic changes were evaluated at 14 dpi by histopathology and collagen assays. We also used reverse transcription polymerase chain reaction to measure the mRNA expression level of transforming growth factor beta 1 (TGF-beta 1) in the lungs of BLM-treated mice. Results: CD69(-/-) mice exhibited less lung damage than WT mice, as shown by reductions in the following indices: (1) loss of body weight, (2) wet/dry ratio of lung, (3) cytokine levels in BALF, (4) histological evidence of lung injury, (5) lung collagen deposition, and (6) TGF-beta 1 mRNA expression in the lung. Conclusion: The present study clearly demonstrates that CD69 plays an important role in the progression of lung injury induced by BLM.
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