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作 者:区景松[1] 欧志君[2] 黄达德[1] 罗兆榴[1] 邓卫兵[1] 陈文广[1]
机构地区:[1]广州医学院附属广州市第一人民医院,广州市临床医学研究所心胸外科,广东广州510180 [2]广州医学院附属广州市第一人民医院,广州市临床医学研究所老年病科心血管专科,广东广州510180
出 处:《中国病理生理杂志》2009年第5期844-847,共4页Chinese Journal of Pathophysiology
基 金:科技部973资助项目(No.2009CB522100);广东省自然科学基金资助项目(No.8151006001000007);教育部留学回国人员专项基金资助项目(No.2005);广东省医药卫生科研基金资助项目(No.A2005302);广州市属高校科技计划医学类重点资助项目(No.1039)
摘 要:目的:探讨内皮衍生微粒(EMP)诱导内皮功能失调的机制和氧自由基(O2.-)在EMP诱导内皮功能失调中所起的作用。方法:从人血纤维蛋白溶酶原激活抑制剂-1刺激的人脐静脉内皮细胞中提取EMP,(1)采用牛主动脉内皮细胞(BAEC)做细胞培养,分成3组。第1组不做预处理,第2组EMP(1×108/L),第3组EMP(1×108/L)+L-nitroarginiemethylester(L-NAME,1mmol/L),预处理BAEC30min后,用超氧化物歧化酶(SOD)可抑制的铁细胞色素C还原法,测量O.2-的产生情况。(2)从小鼠中分离面动脉,分成4组。第1组不做预处理,第2组EMP(1×108/L),第3组EMP(1×108/L)+SOD(2×105U/L),第4组EMP(1×108/L)+聚乙烯羟乙酸盐超氧化物歧化酶(PEG-SOD,2×105U/L)预处理血管10min后做乙酰胆碱(ACH)诱导下的内皮依赖血管舒张功能试验。结果:(1)EMP明显增加BAECO.2-产生,L-NAME可以抑制50%EMP导致的O.2-产生增加。(2)EMP明显损伤ACH诱导的血管舒张功能,SOD处理未能清除EMP对血管舒张功能的损伤,PEG-SOD可部分恢复EMP处理后的血管舒张功能。结论:EMP诱导血管内皮功能失调至少部分是通过诱导细胞内产生的O2.-所致,为将来寻找包括清除O.2-在内的综合治疗方法提供理论依据。AIM: To investigate the mechanism of endothelium - derived microparticles (EMP) - induced endothelial dysfunction and the role of superoxide anion ( O2 ) in EMP - induced endothelial dysfunction. METHODS : EMP were isolated from human umbilical vein endothelial cells stimulated with plasminogen activated inhibitor - 1. ( 1 ) Cultured bovine aortic endothelial cells (BAEC) were divided into 3 groups and pretreated with nothing in group 1, EMP (1×10^8/ L) in group 2, EMP ( 1 × 10^8/L) + L - nitroarginiemethylester ( L - NAME, 1 mmol/L) in group 3 for 30 min and A23187 (5 μmol/L) stimulated O2 generation was determined by superoxide dismutase (SOD) -inhibitable ferricytochrome C reduction. (2) Facialis arteries (60 -150 microns) were isolated from C57BL/6 mice and divided into 4 groups. The vessels were pretreated with nothing in group 1, EMP (1 × 10^8/L) in group 2, EMP (1 × 10^5/L) + SOD (2 ×10^5 U/L) in group 3, EMP (1 ×10^8/L) + polyethylene glycolated- SOD (PEG- SOD, 2 ×10^5 U/L) in group 4 for 10 min and acetylcholine (ACH) - induced vasodilation was measured. RESULTS: ( 1 ) EMP significantly increased O2^- generation in BAEC culture, which was prevented about 50% by pretreating the BAEC with L - NAME. (2) EMP significantly impaired ACH - induced vasodilation. SOD could not restore EMP - impaired ACH - induced vasodilation and PEG - SOD showed partial restoration of vasodilation. CONCLUSION: These data indicate that at least some EMP - induced endothelial dysfunction occurs by inducing intracellular O2^- generation. It may provide a theoretical evidences in finding a multiple treatment including removal of O2^- in the future.
分 类 号:R331.3[医药卫生—人体生理学]
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