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IL33 Is a Stomach Alarmin That Initiates a Skewed Th2 Response to Injury and Infection. | LitMetric

IL33 Is a Stomach Alarmin That Initiates a Skewed Th2 Response to Injury and Infection.

Cell Mol Gastroenterol Hepatol

Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia; Department of Paediatrics, Royal Children's Hospital, University of Melbourne, Parkville, Victoria, Australia.

Published: March 2015

AI Article Synopsis

Article Abstract

Background & Aims: Interleukin (IL)33 is a recently described alarmin that is highly expressed in the gastric mucosa and potently activates Th2 immunity. It may play a pivotal role during infection. Here, we delineate the role of IL33 in the normal gastric mucosa and in response to gastropathy.

Methods: IL33 expression was evaluated in mice and human biopsy specimens infected with and in mice after dosing with aspirin. IL33 expression was localized in the gastric mucosa using immunofluorescence. Mice were given 1 or 7 daily doses of recombinant IL33 (1 μg/dose), and the stomach and the spleen responses were quantified morphologically, by flow cytometry and using quantitative reverse-transcription polymerase chain reaction and immunoblotting.

Results: In mice, the IL33 protein was localized to the nucleus of a subpopulation of surface mucus cells, and co-localized with the surface mucus cell markers Ulex Europaeus 1 (UEA1), and Mucin 5AC (Muc5AC). A small proportion of IL33-positive epithelial cells also were Ki-67 positive. IL33 and its receptor Interleukin 1 receptor-like 1 (ST2) were increased 4-fold after acute (1-day) infection, however, this increase was not apparent after 7 days and IL33 expression was reduced 2-fold after 2 months. Similarly, human biopsy specimens positive for had a reduced IL33 expression. Chronic IL33 treatment in mice caused systemic activation of innate lymphoid cell 2 and polarization of macrophages to the M2 phenotype. In the stomach, IL33-treated mice developed transmural inflammation and mucous metaplasia that was mediated by Th2/signal transducer and activator of transcription 3 signaling. Rag-1 mice, lacking mature lymphocytes, were protected from IL33-induced gastric pathology.

Conclusions: IL33 is highly expressed in the gastric mucosa and promotes the activation of T helper 2-cytokine-expressing cells. The loss of IL33 expression after prolonged infection may be permissive for the T helper 1-biased immune response observed during infection and subsequent precancerous progression.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5301136PMC
http://dx.doi.org/10.1016/j.jcmgh.2014.12.003DOI Listing

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