title: ETO/MTG8 is an inhibitor of C/EBPbeta activity and a regulator of early adipogenesis.
abstract: The putative transcriptional corepressor ETO/MTG8 has been extensively studied due to its involvement in a chromosomal translocation causing the t(8;21) form of acute myeloid leukemia. Despite this, the role of ETO in normal physiology has remained obscure. Here we show that ETO is highly expressed in preadipocytes and acts as an inhibitor of C/EBPbeta during early adipogenesis, contributing to its characteristically delayed activation. ETO prevents both the transcriptional activation of the C/EBPalpha promoter by C/EBPbeta and its concurrent accumulation in centromeric sites during early adipogenesis. ETO expression rapidly reduces after the initiation of adipogenesis, and this is essential to the normal induction of adipogenic gene expression. These findings define, for the first time, a molecular role for ETO in normal physiology as an inhibitor of C/EBPbeta and a novel regulator of early adipogenesis.
authors.affiliation: Department of Clinical Biochemistry, University of Cambridge, Box 232, Level 4, Addenbrooke's Hospital, Hills Rd., Cambridge CB2 2QR, United Kingdom.
authors.forename: Justin J
authors.initials: JJ
authors.lastname: Rochford
authors.forename: Robert K
authors.initials: RK
authors.lastname: Semple
authors.forename: Matthias
authors.initials: M
authors.lastname: Laudes
authors.forename: Keith B
authors.initials: KB
authors.lastname: Boyle
authors.forename: Constantinos
authors.initials: C
authors.lastname: Christodoulides
authors.forename: Claire
authors.initials: C
authors.lastname: Mulligan
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Lelliott
authors.forename: Sven
authors.initials: S
authors.lastname: Schinner
authors.forename: Dirk
authors.initials: D
authors.lastname: Hadaschik
authors.forename: Meera
authors.initials: M
authors.lastname: Mahadevan
authors.forename: Jaswinder K
authors.initials: JK
authors.lastname: Sethi
authors.forename: Antonio
authors.initials: A
authors.lastname: Vidal-Puig
authors.forename: Stephen
authors.initials: S
authors.lastname: O'Rahilly
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000378:metabolism; D000273:Adipose Tissue / Q000254:growth & development* / Q000378:metabolism*; D000818:Animals; D022782:CCAAT-Enhancer-Binding Protein-beta / Q000037:antagonists & inhibitors*; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D006801:Humans; D050356:Lipid Metabolism; D051379:Mice; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D000075142:RUNX1 Translocation Partner 1 Protein; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014162:Transfection
chemical_list: D022782:CCAAT-Enhancer-Binding Protein-beta; D004268:DNA-Binding Proteins; C493598:MTG8 protein, mouse; D011518:Proto-Oncogene Proteins; D000075142:RUNX1 Translocation Partner 1 Protein; C082222:RUNX1T1 protein, human; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors