Abstract
Alveolitis of sarcoidosis is characterized by activated alveolar macrophages (AMs) and T cells. The mediators interleukin-1 (IL-1) and interleukin 6 (IL-6) released by AMs represent essential factors for the progression of the T cells in the cell cycle. The role of IL-1 in pulmonary sarcoidosis has previously been studied; however, the relevance of other mediators (i.e. IL-6) has not yet been evaluated. We measured the spontaneous and lipopolysaccharide (LPS)-induced release of IL-6 and tumor necrosis factor a (TNFα) by bronchoalveolar lavage cells (BAL) and peripheral blood mononuclear cells (PBMNC) in 6 control subjects (group A) and in 15 patients with sarcoidosis, 10 with active (group B), 5 with inactive disease (group C). IL-6 as well as TNFα were spontaneously released by BAL cells of the active group in significantly greater amounts compared to both other groups; IL-6: A, 165.5 pg/ml/24 hr/106 cells (range, 0–604), B, 946 (0–2467), C, 16.6 (0–83); TNFα: A, 162 pg/ml/24 hr/106 cells (0–523), B, 803 (100–17352), C, 100 (0–379). In all groups autologous PBMNC proved to be quiescent, releasing only baseline levels of the cytokines tested. After stimulation with LPS all these cells released great quantities of IL-6 and TNFα. In active disease a positive correlation between IL-6 and TNFα release was observed (r = 0.77, p < 0.02). The present study documents that in active sarcoidosis the spontaneous release of IL-6 by BAL cells parallels the spontaneous release of TNFα. IL-6 is capable of initiating the proliferation and activation of T cells in the lung.
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Homolka, J., Müller-Quernheim, J. Increased interleukin 6 production by bronchoalveolar lavage cells in patients with active sarcoidosis. Lung 171, 173–183 (1993). https://doi.org/10.1007/BF00183946
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DOI: https://doi.org/10.1007/BF00183946