攜帶VEGF和Ang1基因的BMSCs對缺血缺氧誘導新生鼠PVL模型的干預研究
[Abstract]:Objective: To study the protective effect of VEGF and Ang1 double gene (BMSCs) on the NU in the PVL model mice. Method: This study is divided into two parts. The first part: the establishment of the PVL model and the change of the level of VEGF and Ang1 in the brain tissue of the neonatal rats were randomly divided into two groups: model group and sham-operation group,30 in the model group and 20 in the sham operation group. In the model group, PVL new mouse model was constructed by ligation of one-sided common carotid artery and in a low-oxygen environment (6% O2 + 94% N2) for 6 hours. After 24 hours,48 hours,72 hours and 7 days after the establishment of the model, the two groups of mice were sacrificed to take brain tissue,4% paraformaldehyde was fixed, HE staining and immunohistochemical staining were performed to determine whether the model was successful, and the level of VEGF and Ang1 in brain tissue was detected by RT-PCR. To understand the relationship between the pathological changes of the brain and the brain. The second part: BMSCs carrying the VEGF and the Ang1 gene were randomly divided into BMSCs-VEGF, BMSC sang1, BMSCs-A + V, BMSCs and model saline control group 5 with the intervention of the BMSCs carrying the VEGF and the Ang1 gene in the ischemia-hypoxia-induced PVL mouse model. In addition,20 newborn mice of the same day were selected to be divided into the air control group only after the common carotid artery was separated. in each group, the corresponding intervention factors were injected into the lateral ventricle of the lateral ventricle of the three-dimensional positioning device within 24 hours after the model, respectively, and the two groups of mice were sacrificed at 24 hours,48 hours,72 hours and 7 days after the intervention, and the two groups of mice were sacrificed to obtain the brain tissue, and the HE staining was performed after the fixation of 4% paraformaldehyde, The pathological changes of brain tissue, the expression of VEGF and Ang1 were observed by immunohistochemical staining and the expression of VEGF and Ang1 was studied by immunohistochemistry, and the level of VEGF and Ang1 mRNA was detected by RT-PCR. Results: The first part: The PVL model of the new mouse was made by the method of single-sided common carotid artery ligation combined with the hypoxia-induced method, the body weight of the model group was slow, the hair was rough and unsmooth, the general specimen of the brain tissue was found in the softening range to form the capsule cavity, The pathological changes of the brain tissue of the PVL model animals were confirmed by HE staining. RT-PCR showed that the expression of VEGF and Ang1 in the brain after the post-operation of the model group was gradually increased, and the level of VEGF and Ang1 mRNA was higher in the 48-hour group than in the sham-operated group. The expression of VEGF and Ang1 in both groups increased with time, but the mean optical density of the model group was significantly higher than that of the sham-operated group (P0.05). The second part:1, BMSCs-V + A group and BMSCs-Ang1 group mice body weight increased after the anesthesia recovery, the pathological examination confirmed that the model rat brain injury was less than that of the other groups, the body weight of the BMSCs and the BMSC sVEGF group is slower, the body weight of the BMSCs and the BMSC sVEGF group is slower, the body weight of the BMSCs and the BMSC sVEGF group is not statistically different (P0.05), and the pathological improvement of the brain tissue is not obvious, The mean optical density of the BMSCs-V + A group and the BMSCs-VEGF group increased, but the average optical density of the BMSCs-V + A group, the BMSCs-Ang1 group and the BMSCs group Ang1 and MBP increased, Compared with the model control group, the expression of VEGF mRNA in BMSCs-V + A group and BMSCs-V + A group was significantly higher than that of the control group (P0.05). The expression of VEGF mRNA in BMSCs-V + A group and BMSCs-V + A group was significantly higher than that of the control group (P0.05), and the Ang1 mRNA levels in BMSCs-V + A and BMSCs-Ang1 group were significantly increased. The difference between the control group and the control group was significant (P0.05). Conclusion:1. The expression of VEGF and Ang1 in the brain tissue of the model group can be increased in the early stage of the injury by using the method of ischemia-hypoxia induction. It is a new way for the effective intervention of PVL to promote the myelopathy of the nerve fibers and to reduce the brain damage of the PVL.
【學位授予單位】:大連醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:R742
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