Chinese Journal of Tissue Engineering Research ›› 2019, Vol. 23 ›› Issue (26): 4148-4153.doi: 10.3969/j.issn.2095-4344.1355

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Changes of vascular endothelial growth factor after repair of pig mandibular defects by nano-hydroxyapatite/collagen composite

Li Dongmei1, Liu Xinhui2, Li Qingxing1 
  

  1. 1Department of Stomatology, the First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China; 2Department of Orthopedics, Nanjing Jiangning Hospital, Nanjing 211100, Jiangsu Province, China
  • Received:2019-03-12
  • Contact: Li Qingxing, Department of Stomatology, the First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China
  • About author:Li Dongmei, Associate chief physician, Department of Stomatology, the First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China
  • Supported by:

    the Medical Science Research Guidance Program of Hebei Province, No. 08069 (to LDM)

Abstract:

BACKGROUND: Nano-hydroxyapatite/collagen composites can promote the repair of mandibular defects, but the mechanism is still unclear.
OBJECTIVE: To investigate the effect of nano-hydroxyapatite/collagen composites on vascular endothelial growth factors in mandibular defects of domestic pigs.
METHODS: Sixty domestic pigs (provided by the Laboratory Animal Center of the First Hospital of Hebei Medical University, China) were randomized into three groups (n=20/group): sham group (no intervention), control group (model of mandibular defect with 10 mm×5 mm×1 mm), and observation group (model of mandibular defect with 10 mm×5 mm×1 mm, and implantation of nano-hydroxyapatite/collagen composite material). At 12 weeks after surgery, the mandibular defect areas were removed for hematoxylin-eosin staining, immunohistochemistry and X-ray examination. The study was approved by the Animal Ethics Committee of the First Hospital of Hebei Medical University.
RESULTS AND CONCLUSION: Hematoxylin-eosin staining showed that some materials in the central part of the material in the observation group were degraded, and a large number of metabolically active cells were dispersed in the material cavity, which was surrounded by numerous trabecular bones. The defect area in the control group was covered by fibrous granulation tissue without obvious osteogenesis. The tissues in the mandibular part of sham group arranged regularly. The area of newly born bone in the observation group was significantly larger than that in the control group (P < 0.05). X-ray examination revealed that there was obvious defect in the control group, and the defect area in the observation group was significantly smaller than that in the control group. Immunohistochemistry results indicated that the expression level of vascular endothelial growth factor in the observation group was significantly higher than that in the control group (P < 0.05). In summary, nano-hydroxyapatite/collagen composite can promote the healing of pig mandibular defect, and increase vascular endothelial growth factor level.

Key words: nano-hydroxyapatite/collagen composite, mandibular defect, vascular endothelial growth factor, new trabecular bone area, histological observation, bone defects, angiogenesis, immunohistochemistry

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