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To study the pattern of lymphokines in bleomycin-induced lung injury, T cells were isolated from lung interstitial tissue (LIL), peribronchial lymphatic tissue (PBLT), and bronchoalveolar lavage (BAL) fluid of bleomycin-"sensitive" C57Bl/6 and bleomycin-"resistant" BALB/c mice at 3, 6, and 14 days following intratracheal instillation of bleomycin or saline. After 48 hours in culture, conditioned media were collected and assayed with specific enzyme-linked immunosorbent assay (ELISA) for interferon (IFN)-gamma, interleukin (IL)-2, IL-4 and IL-5. In bleomycin-treated C57B1/6 mice, IFN-gamma production was increased up to 20-fold at 3 and 6 days in LIL, and at 3 days in PBLT lymphocytes. IL-4 production was slightly decreased in LIL and PBLT lymphocytes at 14 days. IL-2 and IL-5 were not changed by bleomycin. In BALB/c mice, IFN-gamma production was increased 5-fold at 14 days, and IL-2 production at 6 days, in LIL but not PBLT. IL-4 and IL-5 were not significantly changed. The increase in IFN-gamma may play a role in the pathogenesis of bleomycin-induced lung injury. Differences in the cytokine pattern between the strains of mice may contribute to the variable strain susceptibility in bleomycin-induced lung injury.
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