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• W2105684004 abstract "Bone formation is a developmental process requiring the differentiation of mesenchymal stem cells into osteoblasts. It is established that Runx2 tightly regulates osteoblast differentiation and bone formation. Fos-related antigen Fra-1 is an essential factor for bone formation. Current evidence does not support a relationship between Fra-1 and Runx2 in osteogenesis. Here, we explored the possibility that Runx2 regulates Fra-1 expression during osteogenic differentiation of C2C12 myogenic progenitor cells. Expression of Fra-1 was induced rapidly after activation of Runx2 in a Tet-on stable C2C12 cell-line (C2C12/Runx2(Dox) sub-line). Transient transfection assay showed that Runx2 activates Fra-1 promoter-reporter activity, suggesting that Fra-1 may be a direct target of Runx2. To determine the minimal region of the Fra-1 promoter that was activated by Runx2, a series of Fra-1 promoter deletion constructs were made. By transient transfection assay, we defined the minimal region to the proximal 342 bp (-84 to +258). Two potential Runx2-binding sites (at positions +139 and +208) were predicted within this region. Mutation of the Runx2 motif at position +208 significantly decreased Fra-1 promoter activity compared to wild type, whereas mutation of Runx2 at position +139 had no effect. Electrophoretic mobility shift assay (EMSA) demonstrated the existence of one atypical Runx2-binding element at position +208, and chromatin immunoprecipitation (ChIP) assay revealed that Runx2 bound to the native Fra-1 promoter in vivo via this site. Finally, forced expression of Fra-1 resulted in upregulation of alkaline phosphatase (ALP), a marker of early osteoblast differentiation. Together, these results indicate that Fra-1 is a direct target of Runx2 during osteogenic differentiation of C2C12 myogenic progenitor cells." @default.
• W2105684004 created "2016-06-24" @default.
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• W2105684004 date "2013-01-01" @default.
• W2105684004 modified "2023-10-15" @default.
• W2105684004 title "Osteogenic differentiation of C2C12 myogenic progenitor cells requires the Fos-related antigen Fra-1 – A novel target of Runx2" @default.
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• W2105684004 doi "https://doi.org/10.1016/j.bbrc.2012.11.033" @default.
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