下颌骨骨折愈合过程中整合素β_1mRNA表达的实验研究

目的:探讨下颌骨骨折愈合过程中整合素B1mRNA时空表达的变化。方法:用地高辛标记的整合素B1mRNA 的寡核苷酸探针,采用组织切片原位杂交技术,观察下颌骨骨折愈合过程中整合素B1mRNA的时空表达变化。结果:骨折愈合过程中,整合素B1mRNA在骨组织细胞,特别是成骨细胞中广泛表达;阳性染色出现于细胞浆和细胞核中;骨组织中的整合素B1mRNA在骨折7 d后表达增强,14至30 d最强,60至90 d时基本接近正常。结论:下颌骨骨折的愈合过程中,骨组织细胞中整合素B1mRNA表达增强,提示整合素B1对骨折的愈合过程具有重要作用。

A Study on mRNA Expression Levels of Integrin

OBJECTIVE: The aim of this study was to investigate the spatial and temporal mRNA expression changes of integrin beta 1 during the healing process of mandibular fractures. METHODS: The in situ hybridization was performed using digoxigenin-labeled integrin beta 1 mRNA oligonucleotide probe. During the healing process of mandibular fractures, the staining pattern of beta 1 mRNA was examined both spatially and time-dependently. RESULTS: Integrin beta 1 was widely present in the cells of the fractured bone, especially in osteoblasts. The positive staining was observed in the cytoplasm and nucleolus of osteoblasts. After 7 days of fracture, the expression level of integrin beta 1 increased. The peak appeared between the 14th and the 30th day, and almost recovered to normal between the 60th and 90th day. CONCLUSION: During the healing process of mandibular fracture, the expression level of integrin beta 1 in bone, especially in osteoblasts rose. It is suggested that integrin beta 1 may play an important role in the fracture healing process.