Role of adenosine in airway inflammation in an allergic mouse model of asthma

• Published in: International immunopharmacology Vol. 6; no. 1; pp. 36 - 45
• Main Authors: Fan, Ming, Jamal Mustafa, S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2006; Elsevier
• Subjects: Adenosine; Adenosine - pharmacology; Adenosine - physiology; Animals; Asthma; Asthma - etiology; Asthma - immunology; Asthma - physiopathology; beta-N-Acetylhexosaminidases - metabolism; Biological and medical sciences; Bronchoalveolar lavage fluid; Bronchoalveolar Lavage Fluid - cytology; Bronchoalveolar Lavage Fluid - immunology; Chemokine CCL11; Chemokines, CC - metabolism; Chronic obstructive pulmonary disease, asthma; Disease Models, Animal; Eosinophil Peroxidase - metabolism; Immunization; Inflammation - etiology; Inflammation - immunology; Inflammation - physiopathology; Inflammation Mediators - metabolism; Inflammatory cell markers; Inflammatory cells; Male; Mast Cells - enzymology; Mast Cells - immunology; Medical sciences; Mice; Mice, Inbred BALB C; Neutrophils - enzymology; Neutrophils - immunology; Peroxidase - metabolism; Pharmacology. Drug treatments; Pneumology; Pollen - immunology; Respiratory System - drug effects; Respiratory System - immunology; Respiratory System - physiopathology; Theophylline; Bronchoalveolar lavage fluid; Adenosine; Inflammatory cell markers; Inflammatory cells; Theophylline; Asthma; Allergy; Animal model; Purine nucleoside; Toxicity; Biological marker; Antiasthma agent; Respiratory system; Respiratory analeptic; Respiratory tract; Bronchoalveolar lavage; Bronchus disease; Xanthine derivatives; Obstructive pulmonary disease; Immunopathology; Lung disease; Respiratory disease; Bronchodilator; Rodentia; Inflammation; Vertebrata; Mammalia; Mouse; Inflammatory cell
• ISSN: 1567-5769; 1878-1705
• DOI: 10.1016/j.intimp.2005.07.008

In the present study, we examined dynamic changes in cellular profile of bronchoalveolar lavage (BAL) fluid after adenosine challenge in ragweed sensitized and challenged mice. Mice systemically sensitized and airway challenged with ragweed showed marked airway inflammation manifesting increased eosinophils, lymphocytes, neutrophils and activated macrophages in BAL. Adenosine challenge further enhanced influx of inflammatory cells into BAL, notably neutrophils from 1 to 72 h and eosinophils from 1 to 48 h time-points ( p < 0.05), which sharply rose at 6-h time-point following adenosine challenge. Greater infiltration of lymphocytes into BAL was observed at 1 and 72 h and macrophages from 6 to 72 h ( p < 0.05) after adenosine challenge. Accordingly, markers of eosinophils, neutrophils and mast cells were analyzed at 6-h time-point after adenosine challenge. Adenosine challenge significantly increased the levels of eosinophil peroxidase, neutrophil myeloperoxidase and β-hexosaminidase in BAL. There were more significant effects of adenosine challenge on the degranulation of mast cells in the lung than that in blood. The chemoattractant, eotaxin, was detected in BAL, which increased after adenosine challenge. Theophylline, a non-specific adenosine receptor antagonist, prevented adenosine-enhanced infiltration of inflammatory cells and their respective markers. Our findings suggest that adenosine plays an important role in airway inflammation in an allergic mouse model.