發(fā)散式?jīng)_擊波對骨髓間充質(zhì)干細(xì)胞體內(nèi)成軟骨分化影響
[Abstract]:Objective: extracorporeal shock wave can not only increase the expression of vascular endothelial growth factor, increase myocardial perfusion and improve left ventricular remodeling, so as to improve the symptoms of patients with ischemic heart disease and treat ischemic heart disease. Moreover, bone cells can transform mechanical signals into biochemical signals and transmit them to osteoclasts and osteoblasts, which can cause bone reconstruction and treat fracture healing or nonunion, which indicates that shock wave can promote tissue regeneration. However, there are few studies on the effect of shock wave on the differentiation of bone marrow mesenchymal stem cells. In this study, bone marrow mesenchymal stem cells (BMSCs) were stimulated with divergent shock waves with different energy to observe the effect of chondrogenesis, and to explore the effect of shock wave on the differentiation of bone marrow mesenchymal stem cells (BMSCs) in vivo. Methods: bone marrow mesenchymal stem cells were isolated from bone marrow and cultured to P3 generation. The morphology of mesenchymal stem cells was observed by inverted microscope. The expression of surface related antigen and the ability of inducing osteogenic adipogenic differentiation were identified as bone marrow mesenchymal stem cells by flow cytometry. In order to explore the chondrogenic differentiation of stem cells regulated by shock wave, we used subcutaneous cell implantation model in nude mice and cartilage injury in knee joint in New Zealand white rabbits. At first, the nude mice were divided into four groups: control group (implanted with calcium alginate to the subcutaneous of nude mice), stem cell group (implanted with calcium alginate wrapped in stem cells), low energy shock wave group (2.0 barge 200 times 10 Hz shock wave) after stimulation of stem cells. The high energy shock wave group (3.0 bar. after 200 times 10 Hz shock wave stimulated stem cells, encapsulated in calcium alginate into nude mice subcutaneously). The samples were examined for histology 3 and 12 months after planting. Then New Zealand white rabbits were divided into 4 groups to establish the articular cartilage injury model. The cells or scaffolds were transplanted into the cartilage injury zone according to the groups. The same steps of grouping and cell processing were performed in nude mice. The samples were examined by histology 3 months after transplantation. Results: in the experiment of subcutaneous cell implantation in nude mice, the samples of the two shock wave groups were larger than those of the other two groups, and the contents of collagen and proteoglycan were more than those of the other two groups. The effect of shock wave under the pressure of 3. Bar was the best. In the rabbit knee joint cartilage repair experiment, there were more cartilage repair tissues, more collagen and proteoglycan content, more orderly cell arrangement and more close links with surrounding tissues in the two shock wave groups. The shock wave of 3. Bar is the best. Conclusion 1. Divergent shock wave has the effect of promoting the differentiation of bone marrow mesenchymal stem cells into chondrocytes in vivo. The promotion of chondrogenesis by shock wave is related to energy, and the pressure is 3. In 0bar, the effect of shock wave on cartilage differentiation was better than that of 2. 0bar.
【學(xué)位授予單位】:中國人民解放軍醫(yī)學(xué)院
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R68
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