Osterix Induces Osteogenic Gene Expression but Not Differentiation in Primary Human Fetal Mesenchymal Stem Cells.
From: Experimental Fetal Medicine Group, Institute of Reproductive and Developmental Biology, Imperial College London, UK. h.kurata@imperial.ac.uk
Tissue engineering
- Publish Date: Jul 2007
- ISSN: 1076-3279
- Volume: 13
- Issue: 7
- Pages: 1513-23
- Medium: Print
- Language: English
- Citation (JAMA): Kurata Hitoshi, Guillot Pascale V, Chan Jerry, et al. Osterix Induces Osteogenic Gene Expression but Not Differentiation in Primary Human Fetal Mesenchymal Stem Cells.. Tissue Eng. Jul 2007;13:1513-23
Abstract
The transcription factor osterix (Osx) is a key regulator of osteoblast differentiation and induces bone formation in embryonic but not adult stem cells. We investigated the effect of up-regulating Osx on an intermediate stem cell type, first trimester fetal mesenchymal stem cells (MSCs), which are more expandable than adult MSCs. Human fetal (hf ) MSCs were transduced with a lentiviral vector encoding human Osx. In undifferentiating MSCs cultures, forced expression of Osx stimulated osteopontin and alkaline phosphatase expression. However, Osx did not up-regulate osteocalcin, a late marker of osteoblast differentiation or result in extracellular calcium crystals, indicating that Osx does not directly mediate terminal differentiation in primary hfMSCs. To understand the downstream effects of Osx expression in primary hfMSCs, we next investigated the regulatory relationship between Osx, and the transcription factors Dlx5, Runx2, and Msx2. Osx induced Dlx5 but did not affect Runx2 and Msx2, whereas stealth ribonucleic acid interference of Osx inhibited Dlx5 without affecting expression of Runx2 and Msx2. In conclusion, Osx regulates osteogenic gene expression in hfMSCs but is insufficient to induce terminal osteogenic differentiation.
Mesh Headings (Keywords): Cell Differentiation, Cells, Cultured, Fetal Stem Cells, Gene Expression Regulation, Humans, Mesenchymal Stem Cells, Osteogenesis, Transcription Factors, Transgenes
Check for Full Text / PubMed Unique Identifier (PMID): 17518720
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