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首页> 外文期刊>Cell biology international. >Dynamic determination of Ox-LDL-induced oxidativeitrosative stress in single macrophage by using fluorescent probes.
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Dynamic determination of Ox-LDL-induced oxidativeitrosative stress in single macrophage by using fluorescent probes.

机译:使用荧光探针动态测定Ox-LDL诱导的单个巨噬细胞中的氧化/亚硝基应激。

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Increased oxidativeitrosative stress, resulting from generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS) appears to play an important role in the inflammatory responses to atherosclerosis. By using MitoTracker Orange CM-H(2)TMRos, CM-H(2)DCFDA (DCF-DA), Dihydrorhodamine 123 (DHR123), DAF-FM, Dihydroethidium (DHE) and JC-1 alone or in all combinations of red and green probes, the present study was designed to monitor the ROS and RNS generation in acute exposure of single monocyte U937-derived macrophage to oxidized low density lipoprotein (Ox-LDL). Acute Ox-LDL (100 microg/ml) treatment increased time-dependently production of intracellular nitric oxide (NO), superoxide (O2*-), hydrogen peroxide (H(2)O(2)) and peroxynitrite (ONOO(-)), and decreased mitochondrial membrane potential (Deltapsi) in single cell. Pretreatment of aminoguanidine (an inhibitor of inducible nitric oxide synthase (iNOS), 10 microM) and vitamin C (an antioxidant agent, 100 microM) for 2h, reduced significantly the Ox-LDL-induced increase of NO and O2*-, and vitamin C completely inhibited increase of intracellular NO and O2*-. In contrast to aminoguanidine, Vitamin C pretreatment significantly prevented Ox-LDL-induced overproduction of NO and O2*- (P<0.01), indicating that antioxidant may be more effective in therapeutic application than iNOS inhibitor in dysfunction of ROS/RNS. By demonstrating a complex imbalance of ROS/RNS via fluorescent probes in acute exposure of single cell to Ox-LDL, oxidativeitrosative stress might be more detected in the early atherosclerotic lesions.
机译:活性氧(ROS)和活性氮(RNS)的产生导致氧化/亚硝化应激的增加似乎在对动脉粥样硬化的炎症反应中起重要作用。通过单独使用MitoTracker Orange CM-H(2)TMRos,CM-H(2)DCFDA(DCF-DA),二氢罗丹明123(DHR123),DAF-FM,二氢乙啶(DHE)和JC-1或以红色的所有组合使用和绿色探针,本研究旨在监测在单核细胞U937衍生的巨噬细胞对氧化低密度脂蛋白(Ox-LDL)的急性暴露中ROS和RNS的产生。急性Ox-LDL(100微克/毫升)处理增加了细胞内一氧化氮(NO),超氧化物(O2 *-),过氧化氢(H(2)O(2))和过氧亚硝酸盐(ONOO(-)的时间依赖性生产),并降低单细胞中的线粒体膜电位(Deltapsi)。氨基胍(一种诱导型一氧化氮合酶(iNOS)的抑制剂,10 microM)和维生素C(一种抗氧化剂,100 microM)的预处理2h,显着降低了Ox-LDL诱导的NO和O2 *-和维生素的增加C完全抑制细胞内NO和O2 *-的增加。与氨基胍相反,维生素C预处理显着阻止了Ox-LDL诱导的NO和O2 *-过量生成(P <0.01),表明抗氧化剂在治疗应用方面可能比iNOS抑制剂在ROS / RNS功能障碍中更有效。通过在单个细胞急性暴露于Ox-LDL中通过荧光探针证明ROS / RNS的复杂失衡,可能在早期的动脉粥样硬化病变中检测到更多的氧化/亚硝基应激。

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