Mastermind-like 1 Is a specific coactivator of beta-catenin transcription activation and is essential for colon carcinoma cell survival.
Misregulation of the Wnt signaling pathway has been linked to many human cancers including colon carcinoma and melanoma. The primary mediator of the oncogenic effects of the Wnt signaling pathway is beta-catenin. Accumulation of nuclear beta-catenin and transcription activation of lymphoid enhancer factor 1 (LEF1)/T-cell factor (TCF) target genes underlie the oncogenic activity. However, the mechanism of beta-catenin-mediated transcriptional activation remains poorly understood. In this study, we identified Mastermind-like 1 (Maml1), which is thought to be a specific coactivator for the Notch pathway, as a coactivator for beta-catenin. We found that Maml1 participates in the Wnt signaling by modulating the beta-catenin/TCF activity. We show in vivo that Maml1 is recruited by beta-catenin on the cyclin D1 and c-Myc promoters. Importantly, we show that Maml1 functions in the Wnt/beta-catenin pathway independently of Notch signaling. Finally, we show that the knockdown of Mastermind-like family proteins in colonic carcinoma cells results in cell death by affecting beta-catenin-induced expression of cyclin D1 and c-Myc. This is the first demonstration of a role for the Mastermind-like family in another signaling pathway and that the knockdown of Mastermind-like family function leads to tumor cell death.
Alves-Guerra
Marie-Clotilde
MC
Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania 19104, USA.
Ronchini
Chiara
C
Capobianco
Anthony J
AJ
D000818:Animals; D003110:Colonic Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D019938:Cyclin D1 / Q000096:biosynthesis / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D019940:Genes, bcl-1; D006367:HeLa Cells; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D051880:Receptors, Notch / Q000378:metabolism; D051820:TCF Transcription Factors / Q000096:biosynthesis / Q000235:genetics*; D015534:Trans-Activators; D014157:Transcription Factors; D015533:Transcriptional Activation; D014162:Transfection; D051153:Wnt Proteins / Q000378:metabolism; D051176:beta Catenin / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism
D004268:DNA-Binding Proteins; C430872:MAML1 protein, human; C489427:MYC protein, human; D009687:Nuclear Proteins; D016271:Proto-Oncogene Proteins c-myc; D051880:Receptors, Notch; D051820:TCF Transcription Factors; D015534:Trans-Activators; D014157:Transcription Factors; D051153:Wnt Proteins; D051176:beta Catenin; D019938:Cyclin D1