氧化应激和Rac1/2对静脉壁的影响及在创伤性深静脉血栓形成中的作用

摘要

BACKGROUND: The molecular mechanism and core regulatory network of deep vein thrombosis are not fully clarified yet.OBJECTIVE: To explore the roles of oxidative stress and Rac1/2 in rat deep vein thrombosis.METHODS: Deep vein thrombosis model in SD rats was established by a champing method femoral veins clamping combinedwith fixation of the lower extremity with plaster. The incidence and serious degree of thrombus were observed by dissecting ratfemoral vein at different time points (2.5 and 25 hours after modeling). The model rats were divided into pre-thrombogenesisgroup (2.5 hours after modeling), thrombogenesis group (25 hours after modeling) and non-thrombogenesis group (25 hours aftermodeling). Then total RNA and protein were extracted from the femoral venous wall tissues.RESULTS AND CONCLUSION: Colorimetry results showed that compared with the non-thrombogenesis group, theconcentration of malondiadehyde in rat femoral vein wall tissues of the thrombogenesis group was the highest (P < 0.05), followedby that of the pre-thrombogenesis group (P < 0.05). The concentrations of total superoxide dismutase and glutathione reductasein the thrombogenesis group were the lowest, followed by those in the pre-thrombogenesis group (P < 0.05). The results of genechip hybridization analysis and real-time PCR showed that compared with the non-thrombogenesis group, the expressions ofRac1 and Rac2 in rat femoral vein wall tissues of thrombogenesis group increased the most, followed by that of thepre-thrombogenesis group (P < 0.05). These findings indicate that the up-regulation of malondialdehyde and Rac1/2 as well asthe activity decrease of total superoxide dismutase and glutathione reductase may lead to the formation of deep venousthrombosis.%背景:深静脉血栓形成的分子机制及核心调控网络目前仍未完全阐明.目的:观察氧化应激和Rac1/2 在大鼠创伤性深静脉血栓形成中的作用.方法:将SD 大鼠采用股静脉钳夹联合下肢石膏制动构建大鼠深静脉血栓模型.不同时间点(造模后2.5 h 和25 h)解剖股静脉观测血栓的发生率及严重程度.再将模型大鼠分为:血栓形成前组(造模后2.5 h)、血栓形成组(创伤后25 h)、血栓未形成组(造模后25 h).获取股静脉壁组织,提取总蛋白质和总RNA.结果与结论:比色法检测结果显示,相比血栓未形成组,血栓形成组大鼠股静脉组织中丙二醛的含量最高(P < 0.05),血栓形成前组次之(P < 0.05);而总超氧化物岐化酶、谷胱甘肽还原酶的活性在血栓形成组最低,血栓形成前组次之(P < 0.05).基因芯片分析及real-time PCR 结果发现,相比血栓未形成组,血栓形成组大鼠股静脉组织中Rac1 和Rac2 的表达最高(P < 0.05),血栓形成前组次之(P < 0.05).结果证实,局部静脉血管壁组织中丙二醛,Rac1/2 表达上调,总超氧化物岐化酶和谷胱甘肽还原酶活性降低,可能导致创伤性深静脉血栓的形成.