Chen Wan-Hong, Cai Shi-Xiong, Wu Xiao-Rong
Department of Outpatient Stomatology, Quanzhou First Hospital Affiliated to Fujian Medical University. Quanzhou 362000, Fujian Province,China. E-mail:
Shanghai Kou Qiang Yi Xue. 2019 Dec;28(6):610-615.
To investigate the mechanism of endothelial progenitor cells(EPCs) bone remodeling during orthodontic tooth movement.
Experimental tooth movement model was established. EPCs were isolated, cultured, and labeled with 10 μmol/L Brdu and injected into rats through tail vein to observe the distribution in periodontal tissue. VEGF was added to EPCs culture medium, cell proliferation ability was measured by MTT assay, cell adhesion was observed under microscope. Transwell assay was used to observe cell migration ability, and VEGF immunohistochemical staining sections of model rats at different time points were made. The expression of VEGF in periodontal tissues at different time points was defected. All data were imputed into SPSS 20.0 software package for statistical analysis.
A rat model of tooth movement was successfully established. EPCs were isolated from cardiac blood. Some spindle-shaped EPCs were observed under microscope and injected into model rats using Brdu-labeled EPCs. With the increase of time, the intensity of fluorescence gradually increased. In the 3d specimen, the fluorescence intensity reached the strongest. The gap between the first and second molars in the experimental group was lower than that in the control group at each time point, with significant difference(P<0.05). The results of VEGF immunohistochemical staining showed that both the tension side and the pressure side of the experimental group were significantly higher than the control group(P<0.05). The expression of VEGF in both osteoblasts and osteoclasts reached a maximum at 14 days. EPCs proliferation and adhesion experiments demonstrated that VEGF promoted proliferation of EPCs and enhanced their adhesion. Transwell experiments showed that VEGF promoted chemotaxis of EPCs.VEGF regulated the biological effects of EPCs.
EPCs can be accumulated in periodontal tissues and participate in periodontal bone remodeling. After EPCs chemotizing to periodontal tissues, they participate in the remodeling of periodontal tissues through mutual regulation of VEGF and other factors, and promote periodontal tissue repair and bone remodeling.
