998 resultados para 33-318


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The barrier surfaces of the skin, lung, and intestine are constantly exposed to environmental stimuli that can result in inflammation and tissue damage. Interleukin (IL)-33-dependent group 2 innate lymphoid cells (ILC2s) are enriched at barrier surfaces and have been implicated in promoting inflammation; however, the mechanisms underlying the tissue-protective roles of IL-33 or ILC2s at surfaces such as the intestine remain poorly defined. Here we demonstrate that, following activation with IL-33, expression of the growth factor amphiregulin (AREG) is a dominant functional signature of gut-associated ILC2s. In the context of a murine model of intestinal damage and inflammation, the frequency and number of AREG-expressing ILC2s increases following intestinal injury and genetic disruption of the endogenous AREG-epidermal growth factor receptor (EGFR) pathway exacerbated disease. Administration of exogenous AREG limited intestinal inflammation and decreased disease severity in both lymphocyte-sufficient and lymphocyte-deficient mice, revealing a previously unrecognized innate immune mechanism of intestinal tissue protection. Furthermore, treatment with IL-33 or transfer of ILC2s ameliorated intestinal disease severity in an AREG-dependent manner. Collectively, these data reveal a critical feedback loop in which cytokine cues from damaged epithelia activate innate immune cells to express growth factors essential for ILC-dependent restoration of epithelial barrier function and maintenance of tissue homeostasis.

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Welsch (Projektbearbeiter): Verurteilung des ehemaligen Versicherungsagenten Padovani (in Umwandlung einer zuvor ausgesprochenen Todesstrafe) zu zwölfjähriger Festungshaft wegen Aufruhrs

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Welsch (Projektbearbeiter): Verurteilung des Handelsagenten Ravaux (Raveaux?), des Buchbinders Schöninger sowie des ehemaligen preußischen Leutnants von Alvensleben (in Umwandlung der zuvor ausgesprochenen Todesstrafe) zu dreijähriger bzw. (im Falle von Alvenslebens) einjähriger Festungshaft wegen bewaffneten Widerstands gegen das Militär

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Welsch (Projektbearbeiter): Starke ungarische Verbände zwischen Gyöngyös und Hatvan; Gefechte bei Tápió-Bicske und Hatvan

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Colorectal cancer (CRC) develops through a multistep process and is modulated by inflammation. However, the inflammatory pathways that support intestinal tumors at different stages remain incompletely understood. Interleukin (IL)-33 signaling plays a role in intestinal inflammation, yet its contribution to the pathogenesis of CRC is unknown. Using immunohistochemistry on 713 resected human CRC specimens, we show here that IL-33 and its receptor ST2 are expressed in low-grade and early-stage human CRCs, and to a lesser extent in higher-grade and more advanced-stage tumors. In a mouse model of CRC, ST2-deficiency protects from tumor development. Moreover, bone marrow (BM) chimera studies indicate that engagement of the IL-33/ST2 pathway on both the radio-resistant and radio-sensitive compartment is essential for CRC development. Mechanistically, activation of IL-33/ST2 signaling compromises the integrity of the intestinal barrier and triggers the production of pro-tumorigenic IL-6 by immune cells. Together, this data reveals a tumor-promoting role of IL-33/ST2 signaling in CRC.

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Siegfried Ucko

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Trägerband: Inc. oct. 361; Vorbesitzer: Dominikanerkloster Frankfurt am Main