title: Snail represses the splicing regulator epithelial splicing regulatory protein 1 to promote epithelial-mesenchymal transition.
abstract: Epithelial-mesenchymal transition (EMT), a tightly regulated process that is critical for development, is frequently re-activated during cancer metastasis and recurrence. We reported previously that CD44 isoform switching is critical for EMT and showed that the splicing factor ESRP1 inhibits CD44 isoform switching during EMT. However, the mechanism by which ESRP1 is regulated during EMT has not been fully understood. Here we show that the transcription repressor Snail binds to E-boxes in the ESRP1 promoter, causing repression of the ESRP1 gene. Biochemically, we define the mechanism by which ESRP1 regulates CD44 alternative splicing: ESRP1 binds to the intronic region flanking a CD44 variable exon and causes increased variable exon inclusion. We further show that ectopically expressing ESRP1 inhibits Snail-induced EMT, suggesting that down-regulation of ESRP1 is required for function by Snail in EMT. Together, these data reveal how the transcription factor Snail mediates EMT through regulation of a splicing factor.
authors.affiliation: Division of Hematology and Oncology, Department of Medicine, Robert H. Lurie Comprehensive Cancer Center, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.
authors.forename: Lauren M
authors.initials: LM
authors.lastname: Reinke
authors.forename: Yilin
authors.initials: Y
authors.lastname: Xu
authors.forename: Chonghui
authors.initials: C
authors.lastname: Cheng
mesh_terms: D017398:Alternative Splicing / Q000502:physiology*; D000818:Animals; D045744:Cell Line, Tumor; D004285:Dogs; D058750:Epithelial-Mesenchymal Transition / Q000502:physiology*; D005091:Exons / Q000502:physiology; D057809:HEK293 Cells; D006801:Humans; D018960:Hyaluronan Receptors / Q000096:biosynthesis* / Q000235:genetics; D020033:Protein Isoforms / Q000096:biosynthesis / Q000235:genetics; D016601:RNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: C497483:CD44 protein, human; C539364:ESRP1 protein, human; D018960:Hyaluronan Receptors; D020033:Protein Isoforms; D016601:RNA-Binding Proteins; D012097:Repressor Proteins