| Impaired cell cycle regulation of the osteoblast-related heterodimeric transcription factor Runx2-Cbfbeta in osteosarcoma cells. | |
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MedLine Citation:
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PMID: 19739101 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Bone formation and osteoblast differentiation require the functional expression of the Runx2/Cbfbeta heterodimeric transcription factor complex. Runx2 is also a suppressor of proliferation in osteoblasts by attenuating cell cycle progression in G(1). Runx2 levels are modulated during the cell cycle, which are maximal in G(1) and minimal beyond the G(1)/S phase transition (S, G(2), and M phases). It is not known whether Cbfbeta gene expression is cell cycle controlled in preosteoblasts nor how Runx2 or Cbfbeta are regulated during the cell cycle in bone cancer cells. We investigated Runx2 and Cbfbeta gene expression during cell cycle progression in MC3T3-E1 osteoblasts, as well as ROS17/2.8 and SaOS-2 osteosarcoma cells. Runx2 protein levels are reduced as expected in MC3T3-E1 cells arrested in late G(1) (by mimosine) or M phase (by nocodazole), but not in cell cycle arrested osteosarcoma cells. Cbfbeta protein levels are cell cycle independent in both osteoblasts and osteosarcoma cells. In synchronized MC3T3-E1 osteoblasts progressing from late G1 or mitosis, Runx2 levels but not Cbfbeta levels are cell cycle regulated. However, both factors are constitutively elevated throughout the cell cycle in osteosarcoma cells. Proteasome inhibition by MG132 stabilizes Runx2 protein levels in late G(1) and S in MC3T3-E1 cells, but not in ROS17/2.8 and SaOS-2 osteosarcoma cells. Thus, proteasomal degradation of Runx2 is deregulated in osteosarcoma cells. We propose that cell cycle control of Runx2 gene expression is impaired in osteosarcomas and that this deregulation may contribute to the pathogenesis of osteosarcoma. |
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Authors:
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Inga A San Martin; Nelson Varela; Marcia Gaete; Karina Villegas; Mariana Osorio; Julio C Tapia; Marcelo Antonelli; Edna E Mancilla; Barry P Pereira; Saminathan S Nathan; Jane B Lian; Janet L Stein; Gary S Stein; Andre J van Wijnen; Mario Galindo |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cellular physiology Volume: 221 ISSN: 1097-4652 ISO Abbreviation: J. Cell. Physiol. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-10-01 Completed Date: 2009-11-13 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 0050222 Medline TA: J Cell Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 560-71 Citation Subset: IM |
Affiliation:
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Faculty of Medicine, Institute of Biomedical Sciences ICBM, University of Chile, Santiago, Chile. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cell Cycle / physiology* Cell Line Cell Line, Tumor Core Binding Factor Alpha 1 Subunit / genetics, metabolism* Core Binding Factor beta Subunit / genetics, metabolism* Cysteine Proteinase Inhibitors G1 Phase / physiology Gene Expression / genetics Gene Expression Regulation, Neoplastic / physiology* Humans Leupeptins / pharmacology Mice Mitosis / physiology Osteoblasts / cytology, metabolism Osteosarcoma / metabolism*, pathology Proteasome Endopeptidase Complex / antagonists & inhibitors, metabolism Rats Ubiquitination / drug effects |
| Grant Support | |
ID/Acronym/Agency:
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AR49069/AR/NIAMS NIH HHS; CA082834/CA/NCI NIH HHS; P01 CA082834-09/CA/NCI NIH HHS; P01 CA082834-090007/CA/NCI NIH HHS; P01 CA082834-11/CA/NCI NIH HHS; R01 AR049069-05/AR/NIAMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Core Binding Factor Alpha 1 Subunit; 0/Core Binding Factor beta Subunit; 0/Cysteine Proteinase Inhibitors; 0/Leupeptins; 133407-82-6/benzyloxycarbonylleucyl-leucyl-leucine aldehyde; EC 3.4.25.1/Proteasome Endopeptidase Complex |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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