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- Title
Integration of phosphatidylinositol 3-kinase, Akt kinase, and Smad signaling pathway in BMP-2-induced osterix expression.
- Authors
Mandal, Chandi Charan; Drissi, Hicham; Choudhury, Goutam Ghosh; Ghosh-Choudhury, Nandini
- Abstract
Osterix (Osx), a BMP-2-regulated transcription factor, controls expression of genes essential for osteoblast differentiation. Using progressive deletion of the Osx promoter, we characterized a Smad binding element (SBE) between -552 and -839 bp from its transcription start site. Electrophoretic mobility shift assay and chromatin immunoprecipitation assay showed binding and in vivo recruitment of Smads 1 and 5 to the Osx SBE. Inactivation of PI 3-kinase by the pharmacologic inhibitor Ly294002 or by dominant negative (DN) enzyme significantly blocked BMP-2-induced Osx protein and mRNA expression and Osx transcription. Finally, both DN PI 3-kinase and DN Akt significantly attenuated Smad 5-dependent transcription of Osx, demonstrating the first evidence for a concerted action of PI 3-kinase/Akt signaling with BMP-specific Smads for expression of Osx.
- Subjects
TRANSCRIPTION factors; MESSENGER RNA; GENE expression; CHROMATIN; PROTEINS
- Publication
Calcified Tissue International, 2010, Vol 87, Issue 6, p533
- ISSN
0171-967X
- Publication type
journal article
- DOI
10.1007/s00223-010-9419-3