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- W1954853176 abstract "The pro-inflammatory cytokines IL-6 and TNF-alpha have been implicated in the pathogenesis of otitis media with effusion (OME). A disease where goblet cells proliferate in a modified respiratory epithelium, leading to the accumulation of a mucin-rich effusion in the middle ear cleft. The MUC5AC and MUC5B mucin gene products have been identified as components of these effusions. To determine the effect of IL-6 and TNF-alpha on MUC5AC and MUC5B secretion we have used HT29-MTX goblet cells, which secrete both types of mucins. MUC5AC and MUC5B mucin secretion was measured by an enzyme-linked immunosorbent assay (ELISA) using a specific monoclonal antibody NCL-HGM-45M1 and polyclonal antiserum TEPA, respectively. Time response (0-72 hours) and dose response (1.5-150 ng/ml) studies were carried out. IL-6 and TNF-alpha stimulated MUC5AC and MUC5B mucin secretion in a time dependent manner, both in pre-confluent and post-confluent cells. IL-6 (15 ng/ml and 20 ng/ml) produced a low and prolonged stimulation of mucin secretion that persisted for 72 hours, with peak response at 24 hours after induction. The IL-6-mediated mucin secretion at 24 hours was concentration-dependent, with a maximal effect at 15 ng/ml. TNF-alpha (20 ng/ml) induced rapid stimulation of mucin secretion within the first 24 hours, with peak response at 7 hours after induction. IL-6 and TNF-alpha exposure significantly increased MUC5AC secretion, but not MUC5B secretion. Maximal levels of cytokine-induced mucin secretion were detected in pre-confluent cells that showed one and a half- and two-fold increases in MUC5AC secretion after IL-6 and TNF-alpha stimulation, respectively, in comparison with post-confluent cells. The results presented here suggest that IL-6 and TNF-alpha generate a differential up-regulation of mucin secretion and thus contribute to the expression of mucin genes in inflammatory responses." @default.
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- W1954853176 date "2001-03-01" @default.
- W1954853176 modified "2023-09-23" @default.
- W1954853176 title "Up-regulation of mucin secretion in HT29-MTX cells by the pro-inflammatory cytokines tumor necrosis factor-alpha and interleukin-6." @default.
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