[Clinical and immunological study of airway disease in collagen vascular disease].

We studied the clinical and immunological characteristics of patients with bronchiolar diseases associated with collagen vascular disease (15 patients with rheumatoid arthritis and 1 primary Sjögren's syndrome). Histological examinations showed that 9 patients had follicular bronchiolitis and 7 had bronchiolitis obliterans. Follicular bronchiolitis was characterized by hyperplasia of bronchus-associated lymphoid tissue, and immunohistochemical studies revealed that the pattern of distribution of T cells and B cells in bronchus-associated lymphoid tissue from patients with follicular bronchiolitis was similar to that in diffuse panbronchiolitis, which may be used as a representative model of chronic respiratory infection. In addition, bacterial cultures of sputum samples were positive in 44% of patients with follicular bronchiolitis and in 71% of patients with bronchiolitis obliterans. These results suggest that antigen stimulation is involved in the development of bronchiolar diseases associated with collagen vascular disease.