title: Difference in the phenotypes of bronchoalveolar lavage lymphocytes in patients with summer-type hypersensitivity pneumonitis, farmer's lung, ventilation pneumonitis, and bird fancier's lung: report of a nationwide epidemiologic study in Japan.
abstract: We performed a nationwide epidemiologic study of hypersensitivity pneumonitis (HP) in Japan by questionnaire and found that 835 cases of HP were recognized during the 1980s; 74.4% were summer-type HP, 8.1% farmer's lung, 4.3% ventilation pneumonitis, 4.1% bird fancier's lung, 2.3% other types, such as chemical worker's lung, and 6.8% of unknown causative agent. It was found that the CD4/CD8 ratios of bronchoalveolar lavage (BAL) lymphocytes were significantly different with the type of disease. The ratio was 0.6 +/- 0.1 (mean +/- SEM) in summer-type HP (N = 271), 4.4 +/- 0.7 in farmer's lung (N = 22), 1.6 +/- 0.3 in ventilation pneumonitis (N = 19), and 2.0 +/- 0.5 in bird fancier's lung (N = 19). In farmer's lung, the CD4/CD8 ratio in smokers was 6.2 +/- 1.9 (N = 6) in contrast with 3.4 +/- 0.7 for nonsmokers (N = 16) (p less than 0.05). It has been generally considered that the phenotypes of BAL lymphocytes in patients with HP are predominately CD8 cells. Our present results, however, indicate that the phenotypes of BAL lymphocytes vary with the type of HP, probably depending on factors such as causative agent, smoking, or staging of the disease.
authors.affiliation: First Department of Internal Medicine, Kumamoto University Medical School, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ando
authors.forename: K
authors.initials: K
authors.lastname: Konishi
authors.forename: R
authors.initials: R
authors.lastname: Yoneda
authors.forename: M
authors.initials: M
authors.lastname: Tamura
mesh_terms: D000367:Age Factors; D000542:Alveolitis, Extrinsic Allergic / Q000453:epidemiology* / Q000276:immunology; D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D001716:Bird Fancier's Lung / Q000453:epidemiology* / Q000276:immunology; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology* / Q000276:immunology; D015704:CD4 Antigens / Q000032:analysis; D016827:CD8 Antigens; D005203:Farmer's Lung / Q000453:epidemiology* / Q000276:immunology; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008214:Lymphocytes / Q000276:immunology*; D010641:Phenotype; D015995:Prevalence; D012621:Seasons; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D015704:CD4 Antigens; D016827:CD8 Antigens