血小板微粒促进血管新生的作用和机制研究
[Abstract]:Background Angiogenesis plays an important role in the whole life process, which is closely related to embryonic development, wound healing, atherosclerotic plaque instability, tumor development and other physiological and pathological processes. Vasculogenesis, angiogenesis, and arteriogenesis. Angiogenesis is the expansion of vascular plexus by activation, proliferation and migration of vascular endothelial cells on the basis of existing blood vessels. Vascular endothelial cells participate in the formation of basic vascular network besides the formation of vascular endothelial cells. Platelets are important cellular components involved in angiopathy. Platelets are activated rapidly when they reach the injured endothelium and release a large number of platelet microvesicles (PMVs). PMVs are a group of 0.1-diameter platelets. In recent years, studies have shown that PMVs can also enhance the proliferation, migration and lumen formation of endothelial cells and induce endothelial progenitor cells by carrying a variety of angiogenic factors (VEGF, PDGF, bFGF, etc.). Our previous study found that PMVs produced by staphylococcal superantigen-like protein 5 (SSL5) activation could promote the expression of inflammatory factors (IL-1 beta, TNF alpha, MCP-1 and MMP-9) in monocytes and induce inflammation. The alteration of cell secretion profile may be another new mechanism of its involvement in angiogenesis, aiming at providing new experimental evidence for a more comprehensive understanding of platelet function and laying a foundation for the prevention and treatment of angiogenesis-related diseases. Content 1. Preparation of thrombin receptor activator 6 (thrombin receptor activator) in vitro HUVECs were cultured in human umbilical vein endothelial cells (HUVECs), desktop solution was used as blank control (Con), supernatant during the preparation of PMVs was used as solvent control (Sup), and matrix colloidal formation test was used to detect the effect of PMVs on HUV. The effect of PMVs on HUVECs-related angiogenesis factors (HIF-1a, VEGF-A, VEGF-A) was detected by real-time quantitative PCR with the supernatant of PMVs preparation as solvent control. Effects of FGF-2, IL-8, MMPs)m RNA expression, Western Blot assay for MMPs protein expression and gelatin zymogram assay for MMPs activity. Inhibitors interfered with MMPs activity and neutralizing antibodies against CD40L, CD40 and P-selectin interfered with the binding of CD40L/CD40 and P-selectin/PSGL-1 between PMVs and HUVECs to study their tubing ability to HUVECs. The angiogenesis of PMVs was studied in vivo by subcutaneous injection of matrix glue in 6-8 weeks old male C57BL/6J mice. Results 1. PMVs had significant angiogenesis effect in vitro. (1) Compared with Con and Sup, PMVs could significantly enhance the tubule formation ability of HUVECs in a dose-dependent manner; (2) PMVs could significantly promote the angiogenesis of HUVECs compared with Con. The proliferation of HUVECs was similar to that of Sup in dose-dependent manner; (3) PMVs promoted the migration of HUVECs in a dose-dependent manner compared with Con and Sup; (2) PMVs promoted angiogenesis in vitro. (1) PMVs had no effect on the expression of HUVECs angiogenesis-related factors (HIF-1a, VEGF-A, FGF-2, MMP-7, TIMP-1) m RNA; however, PMVs did not affect the expression of HUVECs in a dose-dependent manner. Inhibiting IL-8 mRNA expression in a dose-dependent manner; (2) PMVs significantly increased the expression and secretion of MMP-2/9 in HUVECs compared with Con and Sup, and enhanced the activity of MMP-2/9 in a dose-dependent manner; (3) GM6001, a total inhibitor of MMPs, could significantly inhibit PMVs-mediated and migration-promoting effects on HUVECs; (4) MMP-2 specific inhibitors inhibited PMVs-mediated and migration-promoting effects. The interaction between CD40L-CD40 and P-selectin-PSGL-1 was not involved in the angiogenesis of PMVs. 3. The role of PMVs in promoting angiogenesis in vivo and its related mechanisms (1) PMVs had significant angiogenesis-promoting effect in vivo; (2) GM6001, a total inhibitor of MMPs, could significantly inhibit the angiogenesis of PMVs in vivo. In addition, the effect of MMP-2 specific inhibitors was significantly better than that of MMP-9 specific inhibitors. Conclusion PMVs have significant angiogenic effects in vitro and in vivo. At the same time, the proliferation-promoting effect of PMVs is similar to that of Sup, but the migration-inducing ability of PMVs is more significant and dose-dependent. By promoting the expression of MMP-2/9 in endothelial cells, up-regulating its activity, degrading extracellular matrix, enhancing the migration ability of endothelial cells, and ultimately promoting angiogenesis, MMP-2 may play a greater role. This study elaborated a new mechanism of PMVs involved in angiogenesis, in order to better understand and understand the function of platelets. It lays the foundation for prevention and treatment of angiogenesis related diseases.
【学位授予单位】:第三军医大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:R54
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