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- W2025670550 abstract "Interleukin-33 (IL-33) is a novel member of the IL-1 cytokine family. It has been shown to elicit a Th2-like cytokine response in immunocompetent cells through binding and activation of the T1/ST2 receptor. IL-33 has recently been associated with immune responses to helminthic intestinal infections, airway inflammation and arthritis in animal models. We now report IL-33 to be produced by colonic epithelial cells in humans and it is highly upregulated in ulcerative colitis (UC). Little mRNA expression was found in control subjects (N = 9), whereas patients with UC in remission (N = 7) and active UC (N = 9) had a 3-fold (p < 0.006) and 13-fold (p < 0.0002) increased expression, respectively. On the protein level, IL-33 in its uncleaved form was overexpressed in active UC compared to controls (p < 0.006) and inactive UC (p < 0.03). Immunohistochemistry of IL-33 confirmed expression in active UC in colonic epithelial cells, whereas no detectable epithelial expression was seen in control specimens. Caspase 1, which is known to activate IL-33, was expressed in colonocytes, albeit at just detectable levels when the activated p20 caspase 1 was measured. Since IL-33 recently has been shown to be biologically active in its pro-form, and cleavage seems to inactivate IL-33, IL-33 is suggested to be active in UC. We found no IL-33 expression in Caco2 cells, regardless of stimulation by pro-inflammatory cytokines. In contrast to the IL-33 expression data, we could not show any difference in the production of another member of the IL-1 cytokine family, IL-1β. This is the first study to describe that IL-33 is upregulated in UC. If IL-33 is driving a Th2-like cytokine response in UC, inhibition of the IL-33 T1/ST2 receptor pathway could be a future therapeutic option in UC." @default.
- W2025670550 created "2016-06-24" @default.
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- W2025670550 date "2010-01-01" @default.
- W2025670550 modified "2023-09-26" @default.
- W2025670550 title "IL-33 is upregulated in colonocytes of ulcerative colitis" @default.
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- W2025670550 doi "https://doi.org/10.1016/j.imlet.2009.11.001" @default.
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