PMID:15778706

Citation	van Es, JH, Jay, P, Gregorieff, A, van Gijn, ME, Jonkheer, S, Hatzis, P, Thiele, A, van den Born, M, Begthel, H, Brabletz, T, Taketo, MM and Clevers, H (2005) Wnt signalling induces maturation of Paneth cells in intestinal crypts. Nat. Cell Biol. 7:381-6
Abstract	Wnt signalling, which is transduced through beta-catenin/TCF4, maintains the undifferentiated state of intestinal crypt progenitor cells. Mutational activation of the pathway initiates the adenomacarcinoma sequence. Whereas all other differentiated epithelial cells migrate from the crypt onto the villus, Paneth cells home towards the source of Wnt signals--that is, the crypt bottom. Here, we show that expression of a Paneth gene programme is critically dependent on TCF4 in embryonic intestine. Moreover, conditional deletion of the Wnt receptor Frizzled-5 abrogates expression of these genes in Paneth cells in the adult intestine. Conversely, adenomas in Apc-mutant mice and colorectal cancers in humans inappropriately express these Paneth-cell genes. These observations imply that Wnt signals in the crypt can separately drive a stem-cell/progenitor gene programme and a Paneth-cell maturation programme. In intestinal cancer, both gene programmes are activated simultaneously.
Links	PubMed Online version:10.1038/ncb1240
Keywords	Animals; Chromatin/immunology; Gene Expression Regulation/physiology; Humans; Immunohistochemistry; In Situ Hybridization; Intercellular Signaling Peptides and Proteins/genetics; Intercellular Signaling Peptides and Proteins/physiology; Intestine, Small/cytology; Intestine, Small/embryology; Intestine, Small/ultrastructure; Mice; Mice, Knockout; Oligonucleotide Array Sequence Analysis/methods; Paneth Cells/cytology; Paneth Cells/physiology; Paneth Cells/ultrastructure; Signal Transduction/physiology; Wnt Proteins
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