4.4 Article

EphrinB2 signaling enhances osteogenic/odontogenic differentiation of human dental pulp stem cells

Journal

ARCHIVES OF ORAL BIOLOGY
Volume 87, Issue -, Pages 62-71

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.archoralbio.2017.12.014

Keywords

Dentin; Odontoblasts; Osteoblasts; Tooth; Tyrosine phosphate receptors; Regeneration

Funding

  1. National Natural Science Foundation of China [81470735]
  2. General Research Fund (GRF) grant from the Research Grants Council of Hong Kong [HKU17126914]

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Objective: To investigate the role of the EphrinB2 signaling pathway in the osteogenesis/odontogenesis of human dental pulp stem cells (DPSCs). Design: The endogenous expression levels of EphrinB2 and its cognate receptors EphB2 and EphB4 in DPSCs were analyzed by qRT-PCR and Western blotting after 7, 14 and 21 days of osteogenic/odontogenic induction culture. Additionally, the phosphorylation of EphrinB2, EphB4 and ERK1/2 proteins at early time-points following osteogenic induction, were also investigated by Western blots. Subsequently, we investigated whether supplementation of recombinant EphrinB2-Fc within the induction milieu can enhance the osteogenic/odontogenic differentiation of DPSCs. Results: Endogenous gene and protein expression levels of EphrinB2, EphB2 and EphB4 were upregulated in induced versus non-induced DPSCs, over 21 days of osteogenic/odontogenic induction. Western blots showed increase in phosphorylated EphrinB2, EphB4 and ERK1/2 proteins at early time-points following osteogenic induction. Preliminary investigation of a concentration range (0, 0.5, 1 and 2 mu g/ml) of recombinant EphrinB2-Fc within osteogenic induction media, showed that 0.5 mu g/ml was optimal for enhancing the osteogenic/odontogenic differentiation of DPSCs over a culture duration of 14 days. Subsequently, more comprehensive qRT-PCR analysis with 0.5 mu g/ml EphrinB2-Fc revealed significant upregulation of several key osteogenic marker genes in treated versus untreated DPSCs after 21 days of osteogenic/odontogenic induction. By 7 days of osteogenic induction, DPSCs treated with 0.5 mu g/ml EphrinB2-Fc exhibited significantly more calcium mineralization (Alizarin red S staining) and alkaline phosphatase activity than the untreated control. Conclusions: EphrinB2 signaling plays a key role in the osteogenic/odontogenic differentiation of DPSCs.

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