PMID:18281035

Citation	Yoshida, T, Kitaura, H, Hagio, Y, Sato, T, Iguchi-Ariga, SM and Ariga, H (2008) Negative regulation of the Wnt signal by MM-1 through inhibiting expression of the wnt4 gene. Exp. Cell Res. 314:1217-28
Abstract	We have reported that a novel c-Myc-binding protein, MM-1, repressed the E-box-dependent transcription activity of c-Myc through TIF1beta/KAP1, a transcriptional corepressor, and that the c-fms gene was a target gene involved in this pathway. We have also reported that a mutation of A157R in MM-1, which is often observed in patients with leukemia or lymphoma, abrogated all of the repressive activities of MM-1 toward c-Myc, indicating that MM-1 is a novel tumor suppressor. In this study, to further identify target genes of MM-1, DNA microarray analysis was carried out by comparing expression levels of genes in MM-1 knockdown and parental cells, and the wnt4 gene, a member of the Wnt-beta-catenin pathway, was identified as a target gene of MM-1. Increased expression level of the wnt4 gene, accumulation and translocation of beta-catenin to the cytoplasm and nucleus, and upregulation of TCF/Lef-1, a target protein of the Wnt-beta-catenin pathway, were found in MM-1 knockdown cells. Reporter assays using various deletion constructs of the wnt4 gene promoter showed that MM-1 recognized the region spanning -286 to -229 from a transcription start site, and MM-1 complex was found to bind to this region by chromatin immunoprecipitation and gel mobility shift assays. Furthermore, it was found that Egr-1 and MM-1 were bound to this region and that both proteins mutually down-regulate promoter activity of the wnt4 gene. Since the c-myc gene is the target gene of the Wnt-beta-catenin pathway, these findings suggest that MM-1 inhibits c-Myc by a dual mechanism.
Links	PubMed Online version:10.1016/j.yexcr.2008.01.002
Keywords	Base Sequence; Cell Line; Early Growth Response Protein 1/metabolism; Gene Expression Regulation; Humans; Lymphoid Enhancer-Binding Factor 1/metabolism; Molecular Sequence Data; Promoter Regions, Genetic/genetics; Protein Binding; Repressor Proteins/metabolism; Signal Transduction; Wnt Proteins/genetics; Wnt Proteins/metabolism; Wnt4 Protein; beta Catenin/metabolism
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
MOUSE:EGR1	enables	GO:0000976: transcription regulatory region sequence-specific DNA binding	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
HUMAN:PFD5	involved_in	GO:0045892: negative regulation of transcription, DNA-templated	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:PFD5	involved_in	GO:0090090: negative regulation of canonical Wnt signaling pathway	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
MOUSE:EGR1	enables	GO:0044212: transcription regulatory region DNA binding	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
MOUSE:EGR1	involved_in	GO:0090090: negative regulation of canonical Wnt signaling pathway	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete

References

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