共查询到19条相似文献,搜索用时 102 毫秒
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目的 探讨饮水铅暴露对大鼠大脑皮质、 小脑、 海马组织中脱嘌呤脱嘧啶核酸内切酶 1(APE1)表达的影响及其与氧化应激的关系。方法 40 只刚断乳雄性 SD 大鼠按体质量随机区组法均分为 5 组, 对照组自由饮用去离子水, 4 个铅暴露组分别饮用 100、 200、 400 和 800 mg/L 醋酸铅溶液, 连续染毒 60 d 后, 取大脑皮质、 小脑和海马组织, 测定各组的超氧化物歧化酶 (SOD) 活力、 过氧化氢 (H2O2) 水平和丙二醛 (MDA) 含量, 蛋白印迹法检测 APE1 蛋白在各组织中的表达。结果 铅暴露后, 大脑皮质、 小脑、 海马中 APE1 蛋白表达水平均低于对照组, 且随染铅剂量的升高呈逐渐下降趋势(P<0.05); 随着染铅剂量的升高, 大脑皮质、 小脑和海马中的 SOD 活力基本呈下降趋势; 而 H2O2及 MDA 含量随染铅剂量的升高基本呈逐渐升高趋势, 大脑皮质、 小脑和海马组织的 APE1 蛋白表达水平与其 SOD 活力呈正相关(r 分别为 0.619、 0.380、 0.375, P < 0.05) ,而与 H2O2水平和 MDA 含量呈负相关(r 分别为-0.472、 -0.535、 -0.436, -0.514、 -0.486、 -0.316, P < 0.05)。结论 饮水铅暴露可导致大鼠脑组织 APE1 蛋白表达水平改变,且此种改变与铅所致的氧化应激有关。 相似文献
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目的 探讨X线修复交叉互补基因1 (XRCC1)与接受含铂方案化疗的晚期非小细胞肺癌(NSCLC)患者的近期疗效的关系.方法 经病理确诊的晚期NSCLC患者62例,接受含铂方案化疗至少2个周期后评价疗效.采用TaqMan探针FQ-PCR法和直接测序法对患者外周血XRCC1第399位密码子进行多态性分析,分析各基因型与晚期NSCLC患者近期疗效及不良反应的的相关性.结果 XRCC1 399至少携带一个Gln等位基因携带者的疗效不如Arg等位基因携带者(14.81%vs.42.86%)(P<0.05).XRCC1不同基因型与化疗不良反应无明显相关性.结论 XRCC1 399多态性与NSCLC患者对铂类药物化疗的敏感性相关. 相似文献
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【摘要】目的 探讨XRCC1基因Arg194Trp、Arg399Gln单核苷酸多态性(SNP)与外生型宫颈鳞状细胞癌放疗敏感性的关系。方法 采用错配扩增聚合酶链式反应(MAMA-PCR)方法检测73例外生型宫颈鳞状细胞癌患者血液标本的XRCC1 Arg194Trp、Arg399Gln两个SNP的基因型频率分布,进一步分析其与宫颈癌放疗敏感性的关系。结果 XRCC1基因Arg194Trp、Arg399Gln基因型完全缓解组和部分缓解组分布情况均无统计学差异(P>0.05)。结论XRCC1基因Arg194Trp、Arg399Gln SNP与外生型宫颈鳞状细胞癌放疗敏感性无相关性。 相似文献
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目的:探讨 X 射线交错互补修复基因1(XRCC1)多态性与晚期非小细胞肺癌(NSCLC)患者对铂类药物化疗敏感性的关系。方法检索PubMed、中国知网、维普等数据库,收集有关晚期NSCLC患者的XRCC1基因399及194位点基因多态性与铂类化疗敏感性关系的文献。以化疗后客观疗效作为评估指标,采用Revman 5.1软件对纳入文献进行异质性检验,计算合并后的优势比(OR)及其95%可信区间(CI),并进行敏感性分析及发表偏倚评估。结果共计13篇文献入选,包括1490例晚期NSCLC患者。与野生基因型相比,XRCC1基因399及194位点至少携带1个突变基因的NSCLC患者对铂类化疗敏感性增加。此外,中国地区XRCC1基因399位点至少携带1个突变基因的NSCLC患者对铂类化疗敏感性亦高于野生基因型。结论 XRCC1基因399及194位点基因多态性影响NSCLC患者对铂类化疗的敏感性;进行基因型检测有利于NSCLC患者的个体化治疗。 相似文献
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目的 运用载体介导的RNA干扰技术靶向抑制人X线修复交叉互补基因1(XRCC1)在支气管上皮细胞中的表达,为研究人XRCC1蛋白在环境化学污染物所致DNA损伤修复中的功能和机制作准备.方法 利用分子克隆技术构建含pU6启动子的XRCC1 RNA干扰特异性绿色荧光蛋白C1载体重组子"pEGFP-C1-U6-dsRNA";以脂质体法将载体重组子转染人支气管上皮细胞,同时以空白细胞和空载体转染细胞作对照;在经G418筛选后,以荧光显微成像技术观察细胞的转染效果,以蛋白印迹法分析转染后细胞中的XRCC1蛋白表达情况.结果 在转染重组子的细胞中,XRCC1蛋白的表达明显下调,仅相当于正常细胞的38.2%.结论 人支气管上皮细胞人X线修复交叉互补基因1的靶向抑制成功. 相似文献
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《中国新药与临床杂志》2019,(11)
目的探讨X线修复交错互补基因1 (XRCC1) rs25487基因多态性对接受铂类药物联合方案化疗的非小细胞肺癌(NSCLC)患者预后的影响。方法回顾性分析2014年1月至2018年9月在徐州医科大学附属医院行含铂类联合化疗方案治疗的NSCLC患者248例,收集患者的临床基本信息。采用PCRRFLP法进行基因分型,分析XRCC1 rs25487的基因型和等位基因分布差异,观察各基因型对铂类药物的疗效差异。采用Log-Rank检验、 Kaplan-Meier生存曲线和Cox风险回归模型评估各基因型患者间的预后差异。结果与GG型患者相比,AG和AA型患者近期疗效改善明显(P=0.041),但远期疗效无显著差异(P>0.05)。与携带等位基因G患者相比,携带等位基因A患者中位无进展生存期和中位总生存期显著缩短(均P=0.019);携带等位基因A患者疾病进展风险增加(HR=1.567, 95%CI:1.070~2.294, P=0.021),死亡风险增加(HR=1.572, 95%CI:1.067~2.317, P=0.022)。结论 XRCC1 rs25487位点多态性是江苏苏北地区汉族NSCLC患者预后不佳的重要因素,等位基因A是引起预后不佳的风险因子。 相似文献
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目的 探讨大肠癌乳腺癌易感蛋白1(BRCA-1)、核苷酸切除修复交叉互补基因1信使核糖核酸(ERCC1mRNA)的表达水平对铂类化疗预后的影响.方法 58例大肠癌患者,均采用FOLFOX化疗方案治疗.对患者手术标本进行BRCA-1、ERCC1mRNA表达水平检测.分析大肠癌组织中BRCA-1、ERCC1mRNA表达情况... 相似文献
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目的观察白藜芦醇能否通过抑制诱导型一氧化氮合成酶(iNOS)mRNA及血红素加氧酶-1(HO-1)mRNA的表达对慢性帕金森病(PD)6-羟基多巴胺(6-OHDA)模型大鼠产生保护效应。方法经筛选无旋转行为的SD大鼠60只,随机选20只分为假手术组及正常给药组(白藜芦醇20 mg.kg-1.d-1);应用6-OHDA纹状体内注射制作PD模型大鼠40只,随机分为模型组和白藜芦醇10、20和40 mg.kg-1.d-1组,每日灌胃给药1次,连续10 wk。电镜下观察黑质神经元超微结构的改变,real-time PCR法检测大鼠黑质部iNOS mRNA及HO-1 mRNA的表达。结果电镜结果显示白藜芦醇治疗组能改善6-OHDA导致的大鼠黑质多巴胺能神经元超微结构的损伤。与模型组比较,白藜芦醇治疗组iNOS mRNA、HO-1 mRNA的表达均明显降低(P<0.01)。结论白藜芦醇对慢性帕金森病6-OHDA模型大鼠具有保护作用,其机制与抑制iNOS mRNA和HO-1 mRNA的表达有关。 相似文献
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For many years after its discovery, hydrogen peroxide (H2O2) was viewed as a toxic molecule to human tissues; however, in light of recent findings, it is being recognized as an ubiquitous endogenous molecule of life as its biological role has been better elucidated. Indeed, increasing evidence suggests that H2O2 may act as a second messenger with a pro-survival role in several physiological processes. In addition, our group has recently demonstrated neuroprotective effects of H2O2 on in vitro and in vivo ischaemic models through a catalase (CAT) enzyme-mediated mechanism. Therefore, the present review summarizes experimental data supporting a neuroprotective potential of H2O2 in ischaemic stroke that has been principally achieved by means of pharmacological and genetic strategies that modify either the activity or the expression of the superoxide dismutase (SOD), glutathione peroxidase (GPx) and CAT enzymes, which are key regulators of H2O2 metabolism. It also critically discusses a translational impact concerning the role played by H2O2 in ischaemic stroke. Based on these data, we hope that further research will be done in order to better understand the mechanisms underlying H2O2 functions and to promote successful H2O2 signalling based therapy in ischaemic stroke. 相似文献
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Kiran Kumar Bokara Iesha Blaylock Stacy Brown Denise Rajanna Bettaiya Sharada Rajanna Prabhakara Rao Yallapragada 《Journal of applied toxicology : JAT》2009,29(5):452-458
This study is intended to determine the effect of lead acetate on glutathione and its associated enzymes of rat brain. Wistar male rats were treated with lead acetate (500 ppm) through drinking water for a period of 8 weeks and parallel controls were maintained. They were sacrificed at the first, fourth and eighth week to isolate whole brains, which were separated into cerebellum, hippocampus, frontal cortex and brain stem. The data indicate enhanced (P < 0.05) glutathione peroxidase (G‐Px) activity at most of the intervals for cerebellum, frontal cortex and brain stem, suggesting conversion of GSH to GSSG, while the hippocampus showed decreased levels. In contrast, glutathione reductase (GR) decreased significantly (P < 0.05) in cerebellum, frontal cortex and brain stem at all intervals except the fourth week in frontal cortex and brain stem. Hippocampus exhibited a gradual and significant (P < 0.05) increase in GR activity. Glutathione‐S‐transferase (GSTase) activity increased with exposure time in all four brain tissues, showing protection against lead acetate toxicity. The GSH and GSSG levels correlated well with the activities of GPx, GR and GSTase in all four regions of the brain. Overall the results indicate that lead acetate affects glutathione‐related enzymes differentially and these changes can be attributed to differences in tissue susceptibility. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Timofeyev MA Shatilina ZM Kolesnichenko AV Kolesnichenko VV Steinberg CE 《Environmental toxicology》2006,21(2):104-110
Aquatic organisms are exposed to a variety of natural chemical stressors such as humic substances. The aim of this study was to investigate the mode of action of natural organic matter (NOM, roughly 80% of which is humic substances) on two freshwater amphipods from Lake Baikal, Eulimnogammarus verrucosus (Gerstf.) and Eulimnogammarus cyaneus (Dyb.), in order to assess the potential oxidative stress of NOM impact. Chosen as oxidative stress markers were lipid peroxidation and cell internal hydrogen peroxide level as well as peroxidase, catalase, and glutathione S-transferase activities. Exposure of amphipods to NOM caused a significant increase in lipid peroxidation but a concomitant decrease in hydrogen peroxide concentration, and peroxidase and (to a lesser degree) glutathione S-transferase activities. An interim increase of catalase activity was observed. A possible reason for the decrease in major antioxidant enzyme activity is exhaustion of the reservoir of reduced substrates in the first stage of the antioxidant defense reaction. Despite the inhibition of major antioxidant enzymes, the studied amphipods were able to successfully resist the NOM oxidative impact and, at low NOM concentrations, to combat lipid peroxidation processes. 相似文献
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没药甾酮对H2O2损伤PC12细胞的保护作用 总被引:3,自引:0,他引:3
探讨没药甾酮(guggulsterone)对氧化应激损伤PC12细胞的保护作用。以过氧化氢(hydrogen peroxide,H2O2)损伤PC12细胞为氧化应激损伤模型, 维生素E为对照, 采用四甲基偶氮唑蓝[3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyl-tetrazolium bromide,MTT]法检测细胞增殖状况; 试剂盒检测乳酸脱氢酶(lactate dehydrogenase,LDH)及一氧化氮(nitric oxide,NO)的释放; DCFH法和Fura 2-AM法检测细胞内活性氧(reactive oxygen species,ROS)和Ca2+的含量; 碘化丙啶(propidium iodide,PI)染色流式细胞术(flow cytometry,FCM)检测细胞凋亡; 罗丹明123(rhodamine 123,Rh 123)染色FCM检测细胞线粒体膜电位(mitochondrial membrane protential,MMP)。结果表明, 没药甾酮(0.1~10 μmol·L-1)可使200 μmol·L-1 H2O2作用24 h后的PC12细胞生长抑制率下降; 细胞外LDH和NO, 细胞内ROS和Ca2+含量降低; 明显抑制200 μmol·L-1 H2O2作用12 h后诱导的PC12细胞凋亡和线粒体膜电位降低作用,没药甾酮(0.1~10 μmol·L-1)使细胞凋亡率由24.3%下降至18.4%、 15.9%、 11.8%。实验结果表明, 没药甾酮对氧化应激损伤PC12细胞具有保护作用, 其机制可能为降低细胞内ROS含量, 进而抑制LDH和NO释放, 降低细胞内Ca2+含量, 升高线粒体膜电位,减少细胞凋亡。 相似文献
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卡维地洛对过氧化氢致血管内皮细胞氧化应激损伤的保护作用 总被引:8,自引:3,他引:8
目的观察卡维地洛(carved ilol)对过氧化氢(hydrogenperoxide,H2O2)致内皮细胞损伤及表面粘附分子表达的影响。方法采用H2O2作为外源性自由基生成系统,模拟内皮细胞的脂质过氧化损伤,建立离体培养的ECV-304细胞氧化应激损伤模型,观察卡维地洛对H2O2致内皮细胞损伤及表面粘附分子表达的影响。结果卡维地洛各浓度组均明显改善H2O2(1.0×10-6mol.L-1)所致ECV-304细胞形态学损伤,提高细胞生存率,降低LDH释放,并可使细胞内及细胞培养液中MDA含量降低,SOD活性升高,亦可下调ICAM-1蛋白及细胞内ICAM-1mRNA表达水平,上述作用随药物浓度增加呈增强趋势。结论卡维地洛可保护内皮细胞结构和功能的完整性,提高内皮细胞抗氧化能力,并从转录水平抑制脂质过氧化诱导的粘附分子表达增加,降低单核-内皮细胞粘附,有利于减少动脉粥样硬化的始动环节和早期事件的发生。 相似文献
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目的 评价子痫前期患者与正常孕妇的脂质过氧化和抗氧化状态的变化.方法 68例女性,年龄23~35岁,分为3组.A组23例为血压正常孕妇,孕期28~39周.B组26例为子痫前期孕妇,孕期28~39周.C组19例为血压正常的健康未孕女性.所有女性均检测血浆丙二醛(MDA)水平来评价机体的脂质过氧化、血浆抗氧化酶超氧化物歧化酶(SOD)、谷胱甘肽过氧化酶、过氧化氢酶以及抗氧化物还原型谷胱甘肽(GSH)和维生素C的水平.结果 B组脂质过氧化水平明显增高.与C组相比A组和B组GSH水平均明显降低而SOD水平均明显升高(P<0.01).与C组相比,A组血浆过氧化氢酶、谷胱甘肽过氧化酶等抗氧化酶水平明显降低(P<0.01).作为抗氧化物的维生素C的水平,与A组和C组比较B组明显升高(P<0.01).结论 机体的先天性抗氧化系统可以对抗子痫前期诱发的氧化应激反应. 相似文献
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Suaib Luqman Shubhangi Kaushik Suchita Srivastava Ritesh Kumar D.U. Bawankule Anirban Pal 《Pharmaceutical biology》2013,51(6):483-490
Plants are universally recognized as a vital part of the world’s natural heritage and up to 80% of the population rely on plants for their primary healthcare. Varieties of medicinal plants are recognized as a source of natural antioxidants that can protect from oxidative stress, thus playing an important role in chemoprevention of diseases. In the present investigation, 22 extracts from different parts of eight medicinal plants (Punica granatum Linn. (Punicaceae), Caesalpinia bonducella Flem. (Fabaceae), Hibiscus subdariffa Linn. [(Malvaceae), Moringa oleifera Lam. (Moringaceae), Garcinia indica Linn. (Clusiaceae), Emblica officinalis Gaertn. (Euphorbiaceae), Momordica charantia Linn. (Cucurbitaceae), and Matricaria chamomilla Linn. (Asteraceae)] were screened for their protection against oxidative stress in erythrocytes induced by hydrogen peroxide (2?mM) and tert-butyl hydroperoxide (0.01?mM). The effect was also compared with known antioxidants and flavonoids. Subjecting erythrocytes to oxidative stress by incubation with hydrogen peroxide and tert-butyl hydroperoxide caused a significant alteration in reduced glutathione (GSH) and malondialdehyde (MDA) concentration compared to the control. Our results show that medicinal plant extracts protect erythrocytes from hydrogen peroxide and tert-butyl hydroperoxide induced oxidative stress; known antioxidant (vitamin C, E, and β-carotene) and flavonoid (quercetin) also showed a similar protective effect. Our observations may, in part, suggest the use of the spent/waste parts of medicinal plants. This could be an economically viable source of natural and potent antioxidants effective against complications arising from oxidative stress. The results may also improve the ethanopharmacological knowledge of medicinal plants. 相似文献
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Davide Ferrigo Valentina Scarpino Francesca Vanara Roberto Causin Alessandro Raiola Massimo Blandino 《Toxins》2021,13(9)
Fusarium proliferatum and Fusarium subglutinans are common pathogens of maize which are known to produce mycotoxins, including moniliformin (MON) and fumonisins (FBs). Fungal secondary metabolism and response to oxidative stress are interlaced, where hydrogen peroxide (H2O2) plays a pivotal role in the modulation of mycotoxin production. The objective of this study is to examine the effect of H2O2-induced oxidative stress on fungal growth, as well as MON and FBs production, in different isolates of these fungi. When these isolates were cultured in the presence of 1, 2, 5, and 10 mM H2O2, the fungal biomass of F. subglutinans isolates showed a strong sensitivity to increasing oxidative conditions (27–58% reduction), whereas F. proliferatum isolates were not affected or even slightly improved (45% increase). H2O2 treatment at the lower concentration of 1 mM caused an almost total disappearance of MON and a strong reduction of FBs content in the two fungal species and isolates tested. The catalase activity, surveyed due to its crucial role as an H2O2 scavenger, showed no significant changes at 1 mM H2O2 treatment, thus indicating a lack of correlation with MON and FB changes. H2O2 treatment was also able to reduce MON and FB content in certified maize material, and the same behavior was observed in the presence and absence of these fungi, highlighting a direct effect of H2O2 on the stability of these mycotoxins. Taken together, these data provide insights into the role of H2O2 which, when increased under stress conditions, could affect the vegetative response and mycotoxin production (and degradation) of these fungi. 相似文献