KLF4對小鼠成骨細胞成骨分化及基質分泌的影響
[Abstract]:Periodontitis is one of the common diseases threatening human oral health, and is a chronic and destructive disease mediated by bacteria and metabolites in periodontal support tissues. The main clinical manifestations of periodontitis are absorption and destruction of alveolar bone, and pathological changes show that the deficiency of bone regeneration is caused by imbalance of bone resorption and bone resorption. Because the prevalence of periodontitis is high, it is closely related to the health of the whole body, the current clinical treatment way is mainly symptomatic treatment, the continuous development of periodontitis is controlled, and no effective treatment measures are available for the bone defect caused by periodontitis, Therefore, deeply exploring the mechanism of bone formation plays an extremely important role in the prevention and treatment of periodontitis. Bone balance is a dynamic process, and the balance between bone resorption caused by osteoblasts and bone resorption caused by osteoclasts is the key to maintaining the homeostasis of bone metabolism. A large number of studies have shown that if bone formation is less than bone resorption, bone diseases such as osteoporosis, periodontal disease, osteoarthritis, rheumatic arthritis, and the like are caused; conversely, bone-hardening disease is caused. Among them, osteoblasts are one of the leading factors of bone metabolism balance, and their activity can be regulated by a variety of factors. Therefore, the study of molecular mechanism of bone formation is of clinical significance to improve the curative effect of repairing the defect caused by bone disease. More and more studies have focused on the occurrence, proliferation and differentiation of osteoblasts, indicating the importance of osteoblasts to bone regeneration in bone-related diseases. Based on the above analysis, this study intends to investigate the effects of KLF4 on osteoblast proliferation and differentiation related genes through the isolation and culture of osteoblasts and the identification and culture of experimental cells, and to investigate the effect of KLF4 on the early bone differentiation of osteoblasts by observing the effect of KLF4 on the proliferation and differentiation of osteoblasts. Finally, the effect of KLF4 on the bone balance in osteoblast differentiation was studied, and the role of KLF4 in osteoblast differentiation was defined, and further theoretical basis was put forward for clinical diagnosis and treatment of periodontal disease. Method: 1. Bone primary cells were obtained from the skull tablets of newborn mice by a segmented enzymatic digestion method. The morphology of the cells was observed under a microscope. ALP staining and scarlet staining were performed after 9 days and 21 days respectively after being cultured for 9 days and 21 days, respectively. The expression of KLF4 in osteoblasts was detected by immunofluorescence; the recombinant adenovirus vector (Ad-KLF4) carrying KLF4 was successfully constructed. The cell green fluorescence was observed under fluorescence microscope after Ad-KLF4 transfected with multiple infection (MOI), and transfection efficiency was detected. Osteoblasts were randomly divided into control group (non-transfected group), KLF4 group (Ad-KLF4 transfection) and GFP group (Ad-GFP transfection). After the best MOI infection, cell proliferation and real-time PCR were detected as bone-related gene alkaline phosphatase (ALP), bone sialoprotein (BSP). Expression of core protein binding factor 2 (RUNX2). The expression of KLF4, MMP2 and COL1 was detected by western-blot. After treatment of osteoblasts with siRNA KLF4 or Ad-KLF4, the effects of MMP2 and COL1 protein and gene expression were observed through wester-blot and Real-time PCR in the early differentiation of osteoblasts and osteoblasts (0d, 2d, 4d). In this experiment, the cell morphology was polygonal in the skull tablet of newborn mice by the enzyme digestion method. In the ALP staining, a large amount of sand-like blue-stained positive particles were observed in the cytoplasm of the cells, and the red-stained red-stained clusters of red cells in the cytoplasm of the cells were observed. Through the observation of cell morphology and the identification of staining, it is shown that the culture of primary cells can be separated by segmented enzymatic digestion, which will lay the foundation for the further progress of this experiment. The recombinant adenovirus vector (Ad-KLF4) carrying the KLF4 gene was successfully constructed by PCR amplification and gene sequencing. After treatment with MOI (100 PFU/ ml), the level of KLF4 protein and mRNA increased significantly in KLF4 group, and the rate of osteoblast proliferation increased significantly. With the prolongation of osteoblast differentiation time, the expression of KLF4 increased continuously with the decrease of MMP2 expression and the increase of COL1 expression. After the infection of KLF4 siRNA of 40NM, the expression of KLF4 gene and protein decreased obviously, while the expression of MMP2 increased and the expression of COL1 decreased. After the infection of Ad-KLF4 infected with MOI = 100 PFU/ ml, the expression level of KLF4 increased significantly, while the expression of MMP2 was down-regulated, and the gene and protein level of COL1 continued to decrease. Conclusion: 1. In this experiment, the bone primary cells were successfully obtained by the method of segmented enzyme digestion, and the second generation cells were good in growth state and good in activity, which could meet the follow-up experimental requirements. The proliferation rate of osteoblasts was increased after the transfection of osteoblasts with Ad-KLF4, and the ALP, BSP and RUNX2 levels of the bone-differentiated genes were down-regulated. Final inhibition of bone formation. 3. In bone balance, KLF4 can regulate the expression of MMP2 in osteoblasts and regulate the secretion of matrix during bone formation, thus affecting bone formation.
【學位授予單位】:第三軍醫(yī)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R781.4
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