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Wnt Ligands Secreted by Subepithelial Mesenchymal Cells Are Essential for the Survival of Intestinal Stem Cells and Gut Homeostasis
Institute of Molecular Life Sciences, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland.
Institute of Molecular Life Sciences, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland.
Department of Molecular Cell Biology, Wolfson Building 623, Weizmann Institute of Science, Rehovot 76100, Israel.
Institute of Molecular Life Sciences, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland.
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2016 (English)In: Cell reports, ISSN 2211-1247, E-ISSN 2211-1247, Vol. 15, no 5, p. 911-918, article id S2211-1247(16)30394-1Article in journal (Refereed) Published
Abstract [en]

Targeting of Wnt signaling represents a promising anti-cancer therapy. However, the consequences of systemically attenuating the Wnt pathway in an adult organism are unknown. Here, we globally prevent Wnt secretion by genetically ablating Wntless. We find that preventing Wnt signaling in the entire body causes mortality due to impaired intestinal homeostasis. This is caused by the loss of intestinal stem cells. Reconstitution of Wnt/β-catenin signaling via delivery of external Wnt ligands prolongs the survival of intestinal stem cells and reveals the essential role of extra-epithelial Wnt ligands for the renewal of the intestinal epithelium. Wnt2b is a key extra-epithelial Wnt ligand capable of promoting Wnt/β-catenin signaling and intestinal homeostasis. Wnt2b is secreted by subepithelial mesenchymal cells that co-express either Gli1 or Acta2. Subepithelial mesenchymal cells expressing high levels of Wnt2b are predominantly Gli1 positive.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 15, no 5, p. 911-918, article id S2211-1247(16)30394-1
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Cell and Molecular Biology
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URN: urn:nbn:se:liu:diva-150034DOI: 10.1016/j.celrep.2016.03.088ISI: 000376164600001PubMedID: 27117411Scopus ID: 2-s2.0-84963955072OAI: oai:DiVA.org:liu-150034DiVA, id: diva2:1237272
Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-08-30Bibliographically approved

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