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  • Title: Analysis of intracellular cytokines in CD4+ and CD8+ lung and blood T cells in sarcoidosis.
    Author: Wahlström J, Katchar K, Wigzell H, Olerup O, Eklund A, Grunewald J.
    Journal: Am J Respir Crit Care Med; 2001 Jan; 163(1):115-21. PubMed ID: 11208635.
    Abstract:
    In pulmonary sarcoidosis, activated T cells accumulate in the lungs. We hypothesized that the balance between the T-helper type 1 (Th1) cytokines (interferon [IFN]-gamma and interleukin [IL]-2) and Th2 cytokines such as IL-4, IL-5, and IL-10 might explain differences in clinical outcome in pulmonary sarcoidosis, such as why patients of human leukocyte antigen (HLA) type DR17 have a much better prognosis than those of other HLA types. Peripheral blood lymphocytes (PBL) and lymphocytes obtained by bronchoalveolar lavage (BAL) from HLA-typed sarcoidosis patients, as well as PBL from healthy controls, were stimulated in vitro, fixed, and permeabilized with saponin. Thereafter, cells were stained with fluorescence- labeled antibodies specific for intracellular cytokines (IL-2, IL-4, IFN-gamma, and tumor necrosis factor (TNF)-alpha and cell surface markers CD4 and CD8, and were subjected to flow-cytometric analysis. In bronchoalveolar lavage fluid (BALF), there were significantly greater frequencies of T cells positive for IFN-gamma and TNF-alpha than there were among PBL, and significantly fewer cells positive for IL-4, in both the CD4+ and CD8+ subsets. HLA-DR17-positive patients showed a tendency toward a less pronounced Th1 response that may be related to their good prognosis. Sarcoidosis patients had higher frequencies of cells positive for IFN-gamma, IL-4, and IL-2 in their blood than did healthy controls, a finding that may reflect the systemic nature of sarcoidosis. A clear Th1 cytokine profile of CD4+ as well as of CD8+ T cells was demonstrated in BALF from sarcoidosis patients. This was most pronounced for CD8+ cells, which may therefore make an important contribution to the inflammatory process in the lungs in pulmonary sarcoidosis.
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