下颌骨骨折愈合过程中血管内皮生长因子及其受体的表达

目的研究血管内皮生长因子(VEGF)及其受体Flt1在下颌骨骨折愈合中的表达规律。方法采用新西兰大耳白兔25只,随机分为术后48h和1、3、5、8周5个时相组,每组5只,以健侧为对照,制作左侧下颌骨体部骨折模型,利用原位杂交、免疫组织化学方法检测VEGF及其受体Flt1在骨折端的表达情况。结果在伤后48h~8周VEGF mRNA及VEGF在骨折部位被多种细胞表达,其表达强度随时间变化而变化,以1~3周为表达的高峰期。在伤后48h~8周的骨折端不同细胞内检测到VEGF的受体Flt1,1~3周为表达高峰期。结论VEGF及其Flt1受体表达贯穿于骨折愈合的始终,VEGF可能在骨折愈合过程中起重要作用。

Vascular endothelial growth factor and its receptor expression in mandibular fracture healing

Objective:To study the expression of vascular endothelial growth factor(VEGF) and its receptor Flt1 in the process of mandibular fracture healing.Methods:The fracture models were made in the middle of the left mandible of 25 rabbits,then the specimens from the fracture site were taken 48 hours and 1,3,5 and 8 weeks after operation respectively. The expression of VEGF and Flt1 was detected by immunohistochemistry and in situ hybridization.Results:VEGF mRNA, VEGF and Flt1 were detected in many kinds of cells in the fracture site from 48 hours to 8 weeks after fracture, and high expression of VEGF and Flt1 were detected from 1 to 3 weeks after facture.Conclusions:VEGF and Flt1 are expressed through the process of fracture healing, VEGF may play important role in the process of blood vessel rebuilding after fracture.