The platelet derived growth factor BB promotes osteogenic differentiation of periodontal ligament stem cells via the Wnt/β-catenin signaling pathway

Objective: To determine the role of platelet derived growth factor BB in the regulation of cell cycle, migration and differentiation of stem cells. Design: The gene was overexpressed in periodontal ligament stem cells using lentiviral vectors. Normal stem cells and empty lentiviral vectors-transfected were used as controls. Real time-PCR, western blotting, Cell Counting Kit-8 assay, flow cytometry, cell scratch test, Alkaline phosphatase activity assay, cell cycle analyses were conducted to assess the biological properties of stem cells. In addition, the effect of platelet derived growth factor BB on the Wnt/beta-catenin signaling pathway were assessed by western blotting and immunofluorescent staining. Results: The gene was successfully overexpressed in periodontal ligament stem cells. The Cell Counting Kit-8, scratch test and cell cycle experiments proved that platelet derived growth factor BB promoted stem cells proliferation, migration and cell cycle progression. The Real time-PCR results showed that the Osterix (OSX) and Bone Morphogenetic Protein 2 (BMP2) genes in the overexpression group were significantly higher than those in the control group, but the Peroxisome Proliferators-activated Receptors (PPAR gamma) and Glycogen Synthase Kinase-3 beta (GSK-3 beta) gene were lower than that in the control group. Western blotting results also indicated that the Collagen Type 1 (COL-1), BMP2, Wnt1 and beta-catenin proteins were increased in the overexpression group. In addition, the expression level of beta-catenin protein in the cell nuclei was higher than that in the control group. Conclusions: In conclusion, overexpression of platelet derived growth factor BB promoted cell proliferation, migration, cell cycle progression and decreased adipogenic differentiation. Furthermore, platelet derived growth factor BB regulated osteogenic differentiation of stem cells through the Wnt/beta-catenin signaling pathway.