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Alteration of alveolar macrophage chemotaxis, cell adhesion, and cell adhesion molecules following ozone exposure of rats
Author(s) -
Bhalla Deepak K.
Publication year - 1996
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/(sici)1097-4652(199612)169:3<429::aid-jcp3>3.0.co;2-q
Subject(s) - chemotaxis , cell adhesion molecule , cell adhesion , integrin alpha m , microbiology and biotechnology , macrophage , motility , adhesion , bronchoalveolar lavage , chemistry , immunology , flow cytometry , biology , cell , in vitro , lung , biochemistry , medicine , receptor , organic chemistry
Ozone (O 3 ) exposure of humans and animals induces an inflammatory response in the lung, which is associated with macrophage stimulation, release of chemotactic agents, and recruitment of polymorphonuclear leukocytes (PMNs). This study was designed to investigate the functional aspects of the macrophages that impact inflammatory processes in the lung. Macrophages recovered by bronchoalveolar lavage (BAL) from rats exposed to purified air or 0.8 ppm O 3 were studied for their chemotactic activity, adhesive interactions with alveolar epithelial cells in culture, surface morphology, and surface expression of cell adhesion molecules. The macrophages isolated from O 3 ‐exposed rats exhibited a greater motility in response to a chemotactic stimulus than the macrophages isolated from rats exposed to purified air. The macrophages from O 3 ‐exposed animals also displayed greater adhesion when placed in culture with epithelial cells isolated from adult rat lung (ARL‐14) than the macrophages from control rats. Both chemotactic motility and cell adhesion stimulated by O 3 exposure were attenuated when the macrophages were incubated in the presence of monoclonal antibodies to leukocyte adhesion molecules, CD11b, or epithelial cell adhesion molecules, ICAM‐1. Flow cytometry revealed a modest increase in the surface expression of CD11b but no change in ICAM‐1 expression in macrophages from O 3 ‐exposed rats when compared to those from the air‐exposed controls. The results demonstrate an alteration of macrophage functions following O 3 exposure and suggest the dependence of these functions on the biologic characteristics, rather than the absolute expression, of the cell adhesion molecules. © 1996 Wiley‐Liss, Inc.