Inhibition of Human Dental Pulp Stem Cell Differentiation by Notch Signaling

• Published in: Journal of dental research Vol. 87; no. 3; pp. 250 - 255
• Main Authors: Zhang, C., Chang, J., Sonoyama, W., Shi, S., Wang, C.-Y.
• Format: Journal Article
• Language: English
• Published: United States SAGE Publications 01.03.2008; SAGE PUBLICATIONS, INC
• Subjects: Alkaline Phosphatase - analysis; Animals; Anthraquinones; Blotting, Western; Calcification, Physiologic - physiology; Calcium - analysis; Calcium-Binding Proteins - physiology; Cell Differentiation - physiology; Cell Transplantation; Cells, Cultured; Coloring Agents; Dental Pulp - cytology; Dentistry; Extracellular Matrix Proteins - analysis; Humans; Intercellular Signaling Peptides and Proteins - physiology; Jagged-1 Protein; Membrane Proteins - physiology; Mesenchymal Stromal Cells - physiology; Mice; Mice, Nude; Odontoblasts - physiology; Phosphoproteins - analysis; Receptor, Notch1 - physiology; Reverse Transcriptase Polymerase Chain Reaction; Serrate-Jagged Proteins; Sialoglycoproteins - analysis; Signal Transduction - physiology; Stem Cells - cytology; Stem Cells - physiology; tooth development; odontoblasts; differentiation; dental pulp stem cells; Notch
• ISSN: 0022-0345; 1544-0591
• DOI: 10.1177/154405910808700312

Notch signaling plays a critical role in development and cell fate specification. Notch receptors and ligands have been found to be expressed in dental epithelium or mesenchyme in the developing tooth, suggesting that Notch signaling may regulate odontogenesis. Post-natal human dental pulp stem cells (DPSCs) isolated from the dental pulp have characteristics of mesenchymal stem cells and can differentiate into odontoblasts. In this study, we examined whether Notch signaling regulated the odontoblastic differentiation of DPSCs. We found that over-expression of the Notch ligand, Jagged-1, activated the Notch signaling pathway in DPSCs. Jagged-1 inhibited the odontoblastic differentiation of DPSCs in vitro. Jagged-1-expressing DPSCs could not form mineralized tissues in vivo. Moreover, over-expression of the constitutively activated Notch1 intracellular domain (Notch-ICD) also inhibited odontoblastic differentiation of DPSCs. Taken together, our results demonstrate that Notch signaling can inhibit the odontoblastic differentiation of DPSCs.