title: Interstitial pneumonitis during murine cytomegalovirus infection and graft-versus-host reaction. Characterization of bronchoalveolar lavage cells.
abstract: Acute murine cytomegalovirus (MCMV) infection alters the course of graft-vs-host (GVH) disease involving major histocompatibility (MHC) antigens and induces interstitial pneumonitis. F1 (B10 x B10.BR) mice given 20 x 10(6) B10.BR spleen cells and MCMV (1 x 10(5) plaque-forming units [PFU]) develop severe, diffuse pneumonitis not seen with either MCMV or GVH alone. As one index of the host immune processes operating in the lungs during MCMV/GVH pneumonitis, we examined the types of cells recovered from the lung by bronchoalveolar lavage (BAL) during pneumonitis. During MCMV/GVH pneumonitis, the total cells recovered significantly increased, due primarily to an influx of Thy 1.2 lymphocytes. Characterization of cells using multiparameter flow cytometric analysis revealed that greater than 80% of all BAL cells were Thy 1.2-positive lymphocytes of donor origin. In addition, donor Thy 1.2-positive cells were of both the L3T4+ (43% of BAL cells) and Lyt 2+ (38% of BAL cells) phenotype. Thus, MCMV infection during GVH to MHC antigens induces interstitial pneumonitis, characterized by an influx of T lymphocytes (both helper and suppressor/cytotoxic) from the donor. The antigenic specificity of these cells is not known.
mesh_terms: D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D003586:Cytomegalovirus Infections / Q000150:complications*; D000939:Epitopes; D005260:Female; D005434:Flow Cytometry; D006086:Graft vs Host Disease / Q000150:complications*; D006680:HLA Antigens; D008214:Lymphocytes / Q000032:analysis; D051379:Mice; D008815:Mice, Inbred Strains; D010641:Phenotype; D011658:Pulmonary Fibrosis / Q000209:etiology* / Q000276:immunology; D013154:Spleen / Q000637:transplantation*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014184:Transplantation, Homologous / Q000009:adverse effects
chemical_list: D000939:Epitopes; D006680:HLA Antigens