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Am. J. Respir. Cell Mol. Biol., Vol 11, No. 5, 11 1994, 531-539.

A protective role for T lymphocytes in asbestos-induced pulmonary inflammation and collagen deposition

E Corsini, MI Luster, J Mahler, WA Craig, ME Blazka and GJ Rosenthal
Environmental Immunology and Neurobiology Section, National Institute of Environmental Health Sciences, Research Triange Park, North Carolina.

Several lines of evidence have suggested that specific (i.e., lymphocyte) immunity plays a role in chemical-induced pulmonary diseases, including asbestosis. To evaluate the influence of cell- mediated immunity in pulmonary inflammation and fibrosis evoked by asbestos fibers, we compared the effects of asbestos in immunodeficient mice (Balb/c nu/nu and severe combined immunodeficient [C3H-SCID]), immunologically normal mice of the same genetic background, and immunodeficient mice reconstituted with syngeneic T lymphocytes. Increases in lavaged cell numbers occurred in asbestos-treated immunodeficient mice compared with asbestos-treated immunocompetent or immunodeficient mice that received T lymphocytes. Differential analysis of the collected cells in treated mice demonstrated a predominantly neutrophilic infiltrate that correlated with increased levels of leukotriene B4 and prostaglandin E2. There were no significant differences between immunocompetent and athymic asbestos-treated mice in bronchoalveolar lavaged total protein. However, asbestos-treated SCID mice revealed a significant increase in protein content and lactate dehydrogenase activity compared with asbestos-treated normal mice, which did not occur in T lymphocyte-reconstituted SCID mice. Fibronectin levels were elevated in asbestos-exposed athymic mice when compared with air-exposed athymic mice or asbestos-exposed immunocompetent mice. Both asbestos-treated athymic and SCID mice showed a significant increase in total lung hydroxyproline when compared with asbestos-treated immunocompetent mice. Lung hydroxyproline was also reduced in asbestos-exposed SCID mice after T lymphocyte reconstitution and, conversely, increased in T cell-depleted Balb/c mice.(ABSTRACT TRUNCATED AT 250 WORDS)


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