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Background:Inflammatory cytokines have been reported to play important roles in the pathogenesis ofinterstitial lung diseases. However, their individual roles in idiopathic interstitial pneumonitis (IIP) and inthe other types of interstitial pneumonitis (IP), including collagen vascular disease associated interstitialpneumonitis (CVD-IP), remain unknown. In this study, we measured the bronchoalveolar lavage (BAL)fluid levels of several cytokines in patients with IIP and CVD-IP.Methods:Cell subpopulations in BAL fluid were counted, and BAL fluid levels of interleukin( IL)-2, -6,-7, -8, -17, interferon (IFN)-g , tumor necrosis factor (TNF)-a , and transforming growth factor (TGF)-b 1 were measured using a bead suspension array or an enzyme-linked immunosorbent assay( ELISA) kitin 16 patients (8 men, 8 women;mean age, 60.0±9.9 years) with idiopathic nonspecific interstitial pneumonitis(NSIP), 5 patients (3 men, 2 women;mean age, 69.0±4.8 years) with idiopathic usual interstitialpneumonitis (UIP), 5 patients (3 men, 2 woman;mean age, 66.3±5.5 years) with rheumatoid arthritis inCVD-IP (RA), and 5 patients (3 man, 2 women;mean age, 52.3±14.5 years) with dermatomyositis inCVD-IP( DM), and 13 patients( 3 men, 10 women;mean age, 51.8±17.2 years) with sarcoidosis.Results:BAL cell subpopulations had high amounts of lymphocytes in NSIP and sarcoidosis, and neutrophilsin RA. Levels of IL-7 were significantly (P |
