Journal
JOURNAL OF STEROID BIOCHEMISTRY AND MOLECULAR BIOLOGY
Volume 116, Issue 1-2, Pages 86-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsbmb.2009.05.007
Keywords
Dexamethasone; TAZ; Mesenchymal stem cells; Osteoblastic differentiation
Funding
- National Foundation for Fostering Talents of Basic Science (NFFTBS) [J0730856]
- Science and Technology Department of Zhejiang Province [2007C33025]
- Scientific Research Fund of Taizhou Hospital of Wenzhou Medical College
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Transcriptional coactivator with PDZ-binding motif (TAZ), a beta-catenin-like molecule, drives mesenchymal stem cell (MSC) to differentiate into osteoblast lineage through co-activation of Runx2-dependent gene transcription and repression of peroxisome proliferator-activated receptor gamma (PPAR gamma)-dependent gene transcription. Dexamethasone (DEX), a synthetic and widely used glucocorticoid, affects osteogenesis. However, the signaling pathway by which DEX affects osteoblastic differentiation remains obscure. In this study, we found that DEX at the concentration of 10(-8) M enhanced calcium deposition, TAZ, bone morphogenetic protein 2 (BMP-2) and alkaline phosphatase (ALP) expression during osteoblastic differentiation. RU486, an antagonist of glucocorticoid receptor, blocked the improvement of TAZ expression while MSCs were treated with 10(-8) M DEX. Moreover, higher concentration (10(-7) M) of DEX robustly suppressed TAZ and ALP expression in MSCs. These findings suggest that TAZ is not only involved in the signal pathway of BMP-2-induced osteoblastic differentiation, but also involved in the signaling pathway of DEX-induced osteoblastic differentiation, supporting the notion that TAZ is a convergence point of two signaling pathways, BMP-2 signaling pathway and Wnt-beta-catenin signaling pathway. (C) 2009 Elsevier Ltd. All rights reserved.
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