title: Inhibition of Wnt signaling by ICAT, a novel beta-catenin-interacting protein.
abstract: Wnt signaling has an important role in both embryonic development and tumorigenesis. beta-Catenin, a key component of the Wnt signaling pathway, interacts with the TCF/LEF family of transcription factors and activates transcription of Wnt target genes. Here, we identify a novel beta-catenin-interacting protein, ICAT, that was found to inhibit the interaction of beta-catenin with TCF-4 and represses beta-catenin-TCF-4-mediated transactivation. Furthermore, ICAT inhibited Xenopus axis formation by interfering with Wnt signaling. These results suggest that ICAT negatively regulates Wnt signaling via inhibition of the interaction between beta-catenin and TCF and is integral in development and cell proliferation.
authors.affiliation: Laboratory of Molecular and Genetic Information, Institute for Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tago
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Nishita
authors.forename: J
authors.initials: J
authors.lastname: Hyodo
authors.forename: S
authors.initials: S
authors.lastname: Nagai
authors.forename: Y
authors.initials: Y
authors.lastname: Murata
authors.forename: S
authors.initials: S
authors.lastname: Adachi
authors.forename: S
authors.initials: S
authors.lastname: Ohwada
authors.forename: Y
authors.initials: Y
authors.lastname: Morishita
authors.forename: H
authors.initials: H
authors.lastname: Shibuya
authors.forename: T
authors.initials: T
authors.lastname: Akiyama
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000818:Animals; D019521:Body Patterning / Q000187:drug effects; D018797:Cell Cycle Proteins; D002455:Cell Division; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D015723:Gene Library; D005799:Genes, Dominant; D051956:Goosecoid Protein; D018398:Homeodomain Proteins / Q000378:metabolism; D006801:Humans; D015151:Immunoblotting; D047908:Intracellular Signaling Peptides and Proteins; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D009124:Muscle Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D016296:Mutagenesis; D011233:Precipitin Tests; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors*; D012097:Repressor Proteins; D015398:Signal Transduction; D051820:TCF Transcription Factors; D015534:Trans-Activators; D058118:Transcription Factor 7-Like 2 Protein; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection; D014407:Tumor Cells, Cultured; D020798:Two-Hybrid System Techniques; D051153:Wnt Proteins; D014981:Xenopus / Q000196:embryology; D029867:Xenopus Proteins; D029961:Zebrafish Proteins; D051176:beta Catenin
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C495266:CTNNB1 protein, Xenopus; C495270:CTNNB1 protein, human; C495267:CTNNB1 protein, mouse; C411982:CTNNBIP1 protein, human; D018797:Cell Cycle Proteins; C498785:Ctnnbip1 protein, mouse; D003598:Cytoskeletal Proteins; C497992:GSC protein, human; D051956:Goosecoid Protein; C497993:Gsc protein, mouse; D018398:Homeodomain Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009124:Muscle Proteins; D011518:Proto-Oncogene Proteins; D012097:Repressor Proteins; D051820:TCF Transcription Factors; C544894:TCF7L2 protein, human; C544895:Tcf7l2 protein, mouse; D015534:Trans-Activators; D058118:Transcription Factor 7-Like 2 Protein; D014157:Transcription Factors; D051153:Wnt Proteins; D029867:Xenopus Proteins; D029961:Zebrafish Proteins; D051176:beta Catenin; C544896:tcf7l2 protein, Xenopus; D008156:Luciferases