FMIP controls the adipocyte lineage commitment of C2C12 cells by downmodulation of C/EBP alpha.

2.50
Hdl Handle:
http://hdl.handle.net/10541/71337
Title:
FMIP controls the adipocyte lineage commitment of C2C12 cells by downmodulation of C/EBP alpha.
Authors:
Mancini, Annalisa; El Bounkari, Omar; Norrenbrock, A-F; Scherr, M; Schaefer, D; Eder, M; Banham, A H; Pulford, K; Lyne, L; Whetton, Anthony D; Tamura, Teruko
Abstract:
Fms interacting protein (FMIP) is a substrate for Fms tyrosine kinase, and a nuclear/cytoplasm shuttling protein with a leucine zipper. As the phosphorylation of FMIP is observed in insulin-stimulated preadipocytes, we examined the role of FMIP in adipocyte differentiation, using the mesenchymal multipotent stem cells, C2C12 cells, that can differentiate into adipocytes, muscle cells and osteoblasts. Ectopic expression of FMIP in C2C12 impairs the adipocyte differentiation induced by treatment with insulin, dexamethasone and 3-isobutyl-1-methylxanthine. These cells exhibit muscle phenotype with multinuclear morphology. Furthermore, knockdown of endogenous FMIP expression by small interfering RNA improves adipocytic lineage commitment of C2C12 cells, while impairing muscle differentiation. Upon stimulation with insulin, CCAAT/enhancer binding protein (C/EBP)beta, but not C/EBPalpha, is upregulated in cells expressing ectopic FMIP, whereas in FMIP knockdown cells, C/EBPalpha is constitutively expressed. Ectopic expression of C/EBPalpha counteracts the effects of FMIP, whereas C/EBPalpha knockdown partially mimics the effects of FMIP in this system. Northern blot analysis and reverse transcriptase-polymerase chain reaction study reveal that ectopic FMIP-expressing cells do not contain the polyadenylated C/EBPalpha mRNA, but contain the C/EBPalpha pre-mRNA, suggesting that FMIP plays a role in RNA processing and/or export. Indeed, a member of the THO complex that plays a role in mRNA export, THOC1, is co-precipitated with FMIP. The data we have acquired on FMIP suggest that it is a target for tyrosine kinase receptors that potentiate mRNA export.
Affiliation:
Institut fuer Biochemie, Medizinische Hochschule Hannover, Hannover, Germany.
Citation:
FMIP controls the adipocyte lineage commitment of C2C12 cells by downmodulation of C/EBP alpha. 2007, 26 (7):1020-7 Oncogene
Journal:
Oncogene
Issue Date:
15-Feb-2007
URI:
http://hdl.handle.net/10541/71337
DOI:
10.1038/sj.onc.1209853
PubMed ID:
16909111
Type:
Article
Language:
en
ISSN:
0950-9232
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorMancini, Annalisa-
dc.contributor.authorEl Bounkari, Omar-
dc.contributor.authorNorrenbrock, A-F-
dc.contributor.authorScherr, M-
dc.contributor.authorSchaefer, D-
dc.contributor.authorEder, M-
dc.contributor.authorBanham, A H-
dc.contributor.authorPulford, K-
dc.contributor.authorLyne, L-
dc.contributor.authorWhetton, Anthony D-
dc.contributor.authorTamura, Teruko-
dc.date.accessioned2009-06-23T15:47:15Z-
dc.date.available2009-06-23T15:47:15Z-
dc.date.issued2007-02-15-
dc.identifier.citationFMIP controls the adipocyte lineage commitment of C2C12 cells by downmodulation of C/EBP alpha. 2007, 26 (7):1020-7 Oncogeneen
dc.identifier.issn0950-9232-
dc.identifier.pmid16909111-
dc.identifier.doi10.1038/sj.onc.1209853-
dc.identifier.urihttp://hdl.handle.net/10541/71337-
dc.description.abstractFms interacting protein (FMIP) is a substrate for Fms tyrosine kinase, and a nuclear/cytoplasm shuttling protein with a leucine zipper. As the phosphorylation of FMIP is observed in insulin-stimulated preadipocytes, we examined the role of FMIP in adipocyte differentiation, using the mesenchymal multipotent stem cells, C2C12 cells, that can differentiate into adipocytes, muscle cells and osteoblasts. Ectopic expression of FMIP in C2C12 impairs the adipocyte differentiation induced by treatment with insulin, dexamethasone and 3-isobutyl-1-methylxanthine. These cells exhibit muscle phenotype with multinuclear morphology. Furthermore, knockdown of endogenous FMIP expression by small interfering RNA improves adipocytic lineage commitment of C2C12 cells, while impairing muscle differentiation. Upon stimulation with insulin, CCAAT/enhancer binding protein (C/EBP)beta, but not C/EBPalpha, is upregulated in cells expressing ectopic FMIP, whereas in FMIP knockdown cells, C/EBPalpha is constitutively expressed. Ectopic expression of C/EBPalpha counteracts the effects of FMIP, whereas C/EBPalpha knockdown partially mimics the effects of FMIP in this system. Northern blot analysis and reverse transcriptase-polymerase chain reaction study reveal that ectopic FMIP-expressing cells do not contain the polyadenylated C/EBPalpha mRNA, but contain the C/EBPalpha pre-mRNA, suggesting that FMIP plays a role in RNA processing and/or export. Indeed, a member of the THO complex that plays a role in mRNA export, THOC1, is co-precipitated with FMIP. The data we have acquired on FMIP suggest that it is a target for tyrosine kinase receptors that potentiate mRNA export.en
dc.language.isoenen
dc.subject.meshAdipocytes-
dc.subject.meshAnimals-
dc.subject.meshCCAAT-Enhancer-Binding Protein-alpha-
dc.subject.meshCell Differentiation-
dc.subject.meshCell Line-
dc.subject.meshCell Lineage-
dc.subject.meshDown-Regulation-
dc.subject.meshHumans-
dc.subject.meshIntracellular Signaling Peptides and Proteins-
dc.subject.meshMice-
dc.subject.meshMuscle Cells-
dc.subject.meshPhenotype-
dc.subject.meshRNA Precursors-
dc.subject.meshRNA, Small Interfering-
dc.titleFMIP controls the adipocyte lineage commitment of C2C12 cells by downmodulation of C/EBP alpha.en
dc.typeArticleen
dc.contributor.departmentInstitut fuer Biochemie, Medizinische Hochschule Hannover, Hannover, Germany.en
dc.identifier.journalOncogeneen

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