神經(jīng)細(xì)胞來源Microparticles在顱腦創(chuàng)傷相關(guān)凝血功能障礙發(fā)生中的機(jī)制研究
[Abstract]:OBJECTIVE: There is no definite mechanism and effective treatment for traumatic brain injury (TBI) related coagulation dysfunction in the world. In this study, we will establish a medium-sized TBI mouse model to observe the content of brain-derived microparticles (BDMP) in circulating blood and the coagulation function. In order to clarify the material basis of TBI-related coagulation dysfunction, to clarify the mechanism of TBI-related coagulation dysfunction, and to explore the prevention and treatment of TBI-induced coagulation dysfunction. The new method has become a new direction for studying the mechanism of TBI related coagulation dysfunction.
Methods: 1) To establish a medium-sized TBI mice model and detect the changes of BDMP content and coagulation function in circulating blood of TBI mice by flow cytometry and activating factor X coagulation time test; 2) To prepare BDMP by step centrifugation of brain tissue homogenate in vitro; 3) To identify the morphology of BDMP by transmission electron microscopy, flow cytometry and Western Blot method. 4) The coagulation-promoting effect of BDMP was detected in vitro by coagulation time test and thrombin production test with activator X. 5) The coagulation-promoting effect of BDMP was detected in vivo by coagulation time test with activator X, plasma fibrinogen level and pathological PTAH staining after injecting BDMP into the tail vein of mice. Flow cytometry and scanning electron microscopy were used to observe the binding of BDMP to platelets; 7) Flow cytometry was used to detect the activation of BDMP on platelets; 8) Transwell chamber system was used to detect the ability of BDMP to penetrate HUVEC cells mediated by platelets; 9) Flow cytometry and activating factor X coagulation time test were used to detect Lactadheri. The scavenging effect of N protein on BDMP.
Results: 1) BDMP expression in circulating blood of TBI mice increased at first and then decreased, and reached its peak at 3 hours after TBI. The platelet poor plasma (PPP) of mice at 3 hours after TBI significantly shortened the coagulation time, and BDMP expression was the highest in PPP. The results of flow cytometry and Western Blot showed that BDMP expressed a lot of specific markers of neurons and glia cells, but not platelets, red blood cells. Leukocyte and endothelial cell markers. Phosphatidylserine (PS) and tissue factor on BDMP can promote coagulation in vitro. At last, BDMP was injected into normal mice. The coagulation time of PPP in mice was prolonged, plasma fibrinogen was decreased, and cellulose deposition was observed by flow cytometry and scanning electron microscopy. In turn, activated platelets can mediate BDMP penetration through activated HUVEC cells; 4) Lactadherin can bind to BDMP. The procoagulant action of BDMP was weakened after binding.
CONCLUSION: 1) BDMP with procoagulant activity was detected in circulating blood of TBI mice, which may be the material basis of TBI-related coagulation dysfunction; 2) BDMP with high purity was successfully prepared by stepwise centrifugation of brain tissue homogenate in vitro, providing sufficient raw materials for subsequent in vitro experiments; 3) BDMP can activate blood. Platelets, and activated platelets can help BDMP penetrate BBB, which partly explains the mechanism of TBI-related coagulation dysfunction; 4) BDMP can bind to Lactadherin protein and inhibit the coagulation-promoting activity of BDMP. The clearance mechanism of BDMP provides a new idea for the treatment of TBI with coagulation dysfunction.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:R651.15
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