降糖复方含药血清对氧化损伤内皮细胞的保护作用

目的：研究降糖复方含药血清对H2O2诱导的血管内皮细胞氧化损伤的保护作用。方法：采用H2O2诱导人脐静脉血管内皮细胞（ECV304）氧化损伤模型,观察细胞形态学变化并测定细胞活力、丙二醛（MDA）、超氧化物歧化酶（SOD）的含量,NO含量以及内皮素（ET-1）含量。结果：降糖复方含药血清可明显改善氧化损伤的ECV304细胞形态学变化,提高细胞存活率,降低MDA含量、提高SOD活力、增加NO释放、减少ET-1释放。结论：降糖复方含药血清能对抗H2O2对血管内皮细胞的氧化损伤,起到保护血管内皮细胞的作用。     

淫羊藿苷对血管紧张素Ⅱ诱导人脐静脉内皮细胞损伤的保护作用

探讨淫羊藿苷对血管紧张素Ⅱ（AngⅡ）诱导损伤人脐静脉内皮细胞株（ECV-304）的影响。培养内皮细胞，淫羊藿苷作用24h后，采用AngII诱导制备内皮细胞损伤模型，测定细胞存活率（MTT法）、培养液中乳酸脱氢酶（LDH）释放量、NO值、清除超氧阴离子自由基（O2^-）和羟自由基（·OH）的能力，测定胞内超氧化物歧化酶（SOD）活性、T-NOS、iNOS以及eNOS的含量。与AngⅡ单独处理组相比，淫羊藿苷能明显提高细胞存活率，提高SOD、T-NOS和cNOS活力，提高NO含量，增强清除O2^-和·OH的能力，降低LDH和iNOS的量。结果表明淫羊藿苷对AngⅡ损伤的内皮细胞有一定的保护作用。     

白藜芦醇苷对羟自由基所致大鼠脑线粒体氧化损伤的保护作用

目的　研究白藜芦醇苷对氧自由基所致大鼠脑线粒体损伤的保护作用 ,探讨白藜芦醇苷治疗心脑血管疾病的机制。方法　利用Fe2 + +VitC系统产生·OH ,诱导大鼠脑线粒体损伤 ;测定线粒体肿胀度、膜流动性、膜磷脂含量以显示线粒体膜功能 ,测定ATPase ,细胞色素C氧化酶活性以显示线粒体能量代谢能力 ,测定超氧化物歧化酶 (SOD)、丙二醛(MDA)以显示线粒体抗氧化能力。结果　·OH造成线粒体显著损伤 ,白藜芦醇苷 (终浓度 10 0、2 0 0、4 0 0mg·L-1)明显抑制膜磷脂降解、线粒体肿胀 ,增加膜流动性 ,改善线粒体能量代谢状态 ,增强抗氧化能力。结论　白藜芦醇苷对氧自由基所致大鼠脑线粒体损伤有明显保护作用 ,其机制与清除自由基、抑制脂质过氧化有关     

白藜芦醇和紫檀芪体外抗肿瘤转移作用

目的比较白藜芦醇和紫檀芪体外抗肿瘤转移作用。方法白藜芦醇和紫檀芪5～50μmol·L-1分别与小鼠黑色素瘤细胞B16F1和内皮细胞ECV304作用48 h,再分别用磺基罗丹明B染色法测定细胞增殖率。白藜芦醇和紫檀芪10μmol·L-1与细胞作用48 h,用划痕实验评价B16F1和ECV304细胞体外迁移能力,用明胶酶电泳和ELISA测定B16F1细胞分泌基质金属蛋白酶2(MMP-2)的活性和含量。用重建基底膜法观察白藜芦醇和紫檀芪10μmol·L-1作用24 h对ECV304细胞拟管腔形成的抑制作用。结果白藜芦醇和紫檀芪作用48 h均能显著抑制B16F1和ECV304细胞增殖,抑制B16F1细胞增殖的IC50分别为119.7μmol·L-1和37.3μmol·L-1,抑制ECV304细胞增殖的IC50分别为72.2μmol·L-1和37.2μmol·L-1。白藜芦醇和紫檀芪10μmol·L-1作用48 h,B16F1细胞愈合率分别为58.0%和36.8%,ECV304细胞愈合率分别为61.8%和28.9%,明显低于正常对照组的67.7%和88.4%(P<0.01),而且紫檀芪组明显低于白藜芦醇组(P<0.01)。与正常对照组相比,白藜芦醇和紫檀芪10μmo·L-1作用48 h使B16F1细胞MMP-2蛋白表达分别降低7.4%和13.9%(P<0.01),MMP-2活性分别降低19.3%和78.9%(P<0.01)。白藜芦醇和紫檀芪作用24 h均可使ECV304细胞管腔样结构破坏,且紫檀芪的作用较白藜芦醇更加明显。结论白藜芦醇和紫檀芪均具有抑制B16F1和ECV304细胞增殖和转移的作用,并能抑制ECV304细胞拟管腔形成;浓度为10μmol·L-1时紫檀芪的抑制作用强于白藜芦醇。     

栀子苷对氧化应激损伤血管内皮细胞的保护作用

目的研究栀子苷对体外培养的人脐静脉内皮细胞(HUVEC)氧化损伤的保护作用。方法采用过氧化氢(Hy-drogen peroxide,H2O2)建立体外培养的HUVEC细胞氧化应激损伤模型。将细胞分为正常对照组、H2O2氧化损伤组、H2O2加栀子苷低、中、高剂量组,其中后3组给予栀子苷预培养24h后加入400μmol.L-1H2O2,然后继续培养12h。MTT法检测细胞存活率;检测各组细胞内超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、一氧化氮合酶(NOS)水平和培养液中一氧化氮(NO)水平;检测细胞内活性氧簇(ROS)水平;用流式细胞仪检测细胞凋亡及周期改变。结果栀子苷能明显提高H2O2损伤的内皮细胞的存活率,提高细胞内SOD、GSH-Px、NOS活性,使培养液中NO含量增加,降低细胞内ROS水平,减少H2O2诱导的细胞凋亡率,恢复血管内皮细胞增殖。结论栀子苷具有较强的抗氧化能力及内皮细胞保护作用,可减轻血管内皮细胞的氧化损伤。     

依达拉奉对过氧化氢致血管内皮细胞氧化损伤的保护作用

目的探讨依达拉奉对过氧化氢(H2O2)致内皮细胞氧化损伤的影响。方法体外培养人脐静脉内皮细胞(HUVEC),采用H2O2作为外源性自由基生成系统,模拟血管内皮细胞氧化应激损伤模型,观察不同剂量依达拉奉对H2O2所致内皮细胞的影响。通过检测各组丙二醛(MDA)的含量反应细胞的损伤程度,检测超氧化物歧化酶(SOD)的活性及总抗氧化能力(T-AOC)反应细胞的抗氧化能力。结果依达拉奉各浓度组均明显降低MDA的含量,提高SOD的活性及总T-AOC,上述作用随药物浓度增加呈增强趋势。结论依达拉奉能降低内皮细胞的氧化损伤程度,提高内皮细胞抗氧化能力。     

姜黄素对过氧化氢诱导的血管内皮细胞损伤的双重作用

目的研究姜黄素(Cur)对过氧化氢(H2O2)诱导的血管内皮细胞ECV304的作用及可能机制;方法胎盘兰计数法分组观察在不同的时间点加入姜黄素后对H2O2诱导的ECV304细胞氧化损伤的作用。流式细胞仪分析细胞周期及细胞凋亡率的变化,试剂盒检测一氧化氮(NO)、丙二醛(MDA)含量及超歧化物氧化酶(SOD)、谷胱甘肽还原酶(GR)活性的变化。结果姜黄素0~100μmol·L-1与H2O2500μmol·L-1同时作用5h,随姜黄素浓度升高细胞存活率升高;25~100μmol·L-1姜黄素预先作用1h,再换为H2O2500μmol·L-1作用4h,细胞存活率明显下降;H2O2500μmol·L-1作用4h,再加入25~100μmol·L-1姜黄素作用1h,细胞存活率也升高。姜黄素对H2O2诱导的细胞凋亡没有明显的影响,但同时作用组、H2O2先作用组S期细胞所占比例升高,姜黄素先作用组S期细胞所占比例下降。同时作用组、H2O2先作用组的SOD、NO、GR水平相对升高,MDA水平下降,姜黄素先作用组的SOD、NO、GR水平相对下降,MDA水平升高。结论姜黄素对H2O2诱导的血管内皮细胞ECV304有双重效应,即有保护效应也有细胞毒效应,与其作用时间点有关。     

银杏达莫在内皮细胞氧化损伤中保护作用的实验研究

目的观察银杏达莫对H2O2引起的体外培养人脐静脉内皮细胞氧化性损伤的保护作用,并初步探讨银杏达莫在动脉内皮氧化损伤中的作用机制。方法 H2O2引起体外培养人脐静脉内皮细胞及家兔动脉内皮氧化性损伤,观察银杏达莫对内皮细胞氧化损伤的保护作用。结果在各试验浓度中较高浓度银杏达莫对H2O2引起体外培养人脐静脉内皮细胞氧化性损伤有明显的保护及促增殖作用。结论银杏达莫对H2O2引起的体外培养人脐静脉内皮细胞氧化性损伤有明显保护作用。     

白花丹参对过氧化氢致人脐静脉血管内皮细胞损伤的保护作用

目的研究白花丹参对过氧化氢（H2O2）所致人脐静脉血管内皮细胞（HUVEC）损失的保护作用。方法应用酶消化灌注法培养人脐静脉血管内皮细胞,采用形态学观察和Ⅷ因子抗体免疫荧光检测法进行鉴定;取对数生长期的细胞分组进行干预,应用形态学观察法和MTT法检测各组血管内皮细胞的活性。结果H2O2损伤模型组细胞损伤明显,经白花丹参高、中、低各剂量组的干预,受损情况均有较明显地改善,使细胞活性（OD值）增高。结论白花丹参对H2O2所致的HUVEC损伤具有保护作用。     

D-聚甘酯对血管内皮细胞损伤的保护作用

目的 用 H_2O_2(200μmol·L~(-1))诱导人脐静脉内皮细胞株ECV304氧化损伤,研究D-聚甘酯(DPS)对血管内皮细胞损伤的保护作用。方法 噻唑蓝(MTT)比色法检测细胞活性,采用试剂盒测定细胞内脂质过氧化产物丙二醛(MDA)含量、培养液中乳酸脱氢酶(LDH)和超氧化物歧化酶(SOD)活性。同时采用流式细胞仪检测损伤后细胞内Ca~(2+)含量,并观察DPS对H_2O_2导致的内皮细胞内钙离子浓度的影响和细胞凋亡的作用。结果DPS 0.1,1,10μg·L~(-1)对损伤后ECV304具有促进增殖作用。DPS 0.1,1μg·L~(-1)使细胞培养液中SOD水平升高并降低细胞内MDA含量,4个剂量的DPS均能使细胞培养液中LDH释放减少。流式细胞术检测结果显示DPS能降低H_2O_2导致的细胞内Ca~(2+)含量的升高,并抑制细胞凋亡。结论 DPS具有保护H_2O_2致血管内皮细胞损伤的作用,其机理可能与其抗脂质过氧化作用,降低损伤后细胞内Ca~(2+)含量并抑制细胞凋亡有关。     

四物口服液对羟基自由基的清除作用

目的 评价四物口服液体外对羟基自由基的清除作用.方法 采用荧光分光光度法,过氧化氢溶液与不同浓度的四物口服液稀释、混匀,254 nm紫外光照射后加入苯甲酸溶液,室温放置后在激发波长304 nm、发射波长401 nm条件下测定荧光强度,用羟基自由基清除率IC50（荧光强度降低50％时药物浓度）作为四物口服液对羟基自由基清除率大小的评价指标.结果 四物口服液体外对羟基自由基清除率IC50为0.009 3倍原药.结论 四物口服液具有体外清除羟基自由基的作用.     

Antioxidant and Free Radical Scavenging Effects of Lippia nodiflora

This study evaluated the in vitro antioxidant potential of methanol extract of Lippia nodiflora Mich. (Verbenaceae) (MELN). The different antioxidants assays, including total antioxidant activity, reducing power, free radical, superoxide anion radical, hydroxyl radical, hydrogen peroxide, nitric oxide scavenging, and total phenolic content, were studied. MELN exhibited potent total antioxidant activity that increased with increasing amount of extract concentration (50, 100, 200, and 400 μg/mL), which were compared with standard drug α -tocopherol (400 μg/mL). The different concentrations of MELN and α -tocopherol showed inhibition of 49.07%, 58.96%, 63.07%, 68.29%, and 74.59%, respectively, on peroxidation in linoleic acid emulsion. In addition, MELN had effective reducing power, free radical scavenging, superoxide anion radical scavenging, hydroxyl radical scavenging, hydrogen peroxide radical scavenging, and nitric oxide scavenging activity, and total phenolic content depending on concentration. These various antioxidant activities were compared with standard antioxidants such as BHA, BHT, catechin, and α -tocopherol.     

金雀异黄素对正常的和过氧化氢损伤的内皮细胞的影响(英文)

目的 :观察金雀异黄素 (genistein)对体外培养的血管内皮细胞 (ECV 3 0 4)生长的影响和对过氧化氢引起ECV 3 0 4细胞损伤的保护作用。方法 :将ECV 3 0 4细胞与金雀异黄素 0 .1～ 1 0 0 μmol·L-1共同孵育 2 4～ 96h ,通过MTT法测定细胞存活率。为了观察金雀异黄素对过氧化氢引起ECV 3 0 4细胞损伤的保护作用 ,将细胞分成 3组 ,分别为对照组、过氧化氢损伤模型组和金雀异黄素治疗组 ,治疗组ECV 3 0 4细胞先与金雀异黄素 6.2 5～ 1 0 0 μmol·L-1共同孵育 3 0min ,然后模型组和治疗组ECV3 0 4细胞均加入过氧化氢 1 0mmol·L-1孵育 ,3 0min后以MTT法测定OD值 ,以此反映各组ECV 3 0 4的生存情况。结果 :金雀异黄素对于正常ECV 3 0 4细胞生长的作用与浓度和作用时间有关 ,浓度为1 0 0 μmol·L-1时 ,作用 2 4,48h能明显促进ECV3 0 4生长 (P <0 .0 1 ) ,而作用 96h则表现为明显的抑制作用 (P <0 .0 5 ) ;浓度为 1 0 μmol·L-1时 ,作用48,72h对ECV 3 0 4细胞生长也有促进作用 (P <0 .0 5 ) ;而当金雀异黄素浓度降低为 0 .1 ,1 μmol·L-1时 ,对ECV 3 0 4细胞生长无明显影响。过氧化氢 1 0mmol·L-1可使ECV 3 0 4的存活率明显下降(P <0 .0 5 ) ;预先给予金雀异黄素 2 5 ,5 0 ,1 0 0 μmol·L-1能浓度依赖性地     

In vitro Antioxidant and Antibacterial Activities of Methanol Extract of Kyllinga nemoralis

The present study was designed to evaluate the antioxidant and antibacterial activity of methanol extract of Kyllinga nemoralis. Six different in vitro antioxidant assays including 2,2-diphenyl-1-picrylhydrazyl, hydroxyl radical, superoxide anion radical, hydrogen peroxide radical, ferric reducing antioxidant power assay and reducing power were carried out to ensure the scavenging effect of the plant on free radicals. In addition, total antioxidant capacity assay, total phenolic contents, tannins, flavonoids and flavonol contents of the plant were also analysed by the standard protocols. Kyllinga nemoralis exhibited high antioxidant activity on 2,2-diphenyl-1-picrylhydrazyl assay (IC₅₀= 90 μg/ml), superoxide radical scavenging assay (IC₅₀= 180 μg/ml) and hydrogen peroxide radical scavenging assay (IC₅₀= 200 μg/ml), compared with standards. These observations provide comprehensible supporting evidence for the antioxidant potential of the plant extract. Reducing power (IC₅₀= 213.16 μg/ml) and hydroxyl radical scavenging activity (IC₅₀= 223 μg/ml) of the plant extract was remarkable. The methanol extract of K. nemoralis exhibited significant antimicrobial activity against Gram-positive human pathogenic bacteria. Standard in vitro antioxidant assays assessed the electron donating ability of the plant extract in scavenging free radicals. The inhibitory effect of the plant extract against bacterial pathogens may be due to the presence of phytochemicals. Thus, the results suggest that Kyllinga nemoralis is a potential source of antioxidants and could serve as the base for drug development.     

Redox properties and cytoprotective actions of atranorin, a lichen secondary metabolite

Atranorin (ATR) is a lichenic secondary metabolite with potential uses in pharmacology. Antinociceptive and antiinflammatory actions have been reported, and the use of atranorin-enriched lichen extracts in folk medicine is widespread. Nonetheless, very few data on ATR biological actions are available. Here, we evaluated free radical scavenging activities and antioxidant potential of ATR using various in vitro assays for scavenging activity against hydroxyl radicals, hydrogen peroxide, superoxide radicals, and nitric oxide. The total reactive antioxidant potential (TRAP) and total antioxidant reactivity (TAR) indexes and in vitro lipoperoxidation were also evaluated. Besides, we determined the cytoprotective effect of ATR on H₂O₂-challenged SH-SY5Y cells by the MTT assay. ATR exerts differential effects towards reactive species production, enhancing hydrogen peroxide and nitric oxide production and acting as a superoxide scavenger; no activity toward hydroxyl radical production/scavenging was observed. Besides, TRAP/TAR analysis indicated that atranorin acts as a general antioxidant, although it demonstrated to enhance peroxyl radical-induced lipoperoxidation in vitro. ATR was not cytotoxic, and also protected SH-SY5Y cells against H₂O₂-induced cell viability impairment. Our results suggest that ATR has a relevant redox-active action, acting as a pro-oxidant or antioxidant agent depending on the radical. Also, it will exert cytoprotective effects on cells under oxidative stress induced by H₂O₂.     

Anti- and pro-oxidant activity of rutin and quercetin derivatives

Some semi-synthetic flavonoids, particularly derivatives of rutin, are used as therapeutic agents in the treatment of diseases involving free radicals. Here, for the first time, a complete study has been made of the relationship between the structure of such molecules and their superoxide, hydroxyl and peroxyl radical scavenging activity. The molecules chosen for this study were rutin, its aglycone (quercetin), and their methyl ethyl and hydroxyl-ethyl derivatives. Our results are consistent with the general agreement on the structural requirements for free radical scavenging activity. Moreover, we have shown that alkylation of the hydroxyl in position 7 enhanced the scavenging, and also that in a Fenton reaction system, some quercetin derivatives with free catechol moiety or free hydroxyl in position 3 (or both) were pro-oxidant, through superoxide radical and hydrogen peroxide production. Although the structural features needed for pro-oxidant activity are not entirely clear, it appears that to avoid pro-oxidant behaviour, the hydroxyl group in position 3 should be blocked to prevent its auto-oxidation. Thus, flavonoids cannot only be considered purely as antioxidants, since under certain reaction conditions they can also display pro-oxidant activity. This unexpected behaviour could explain, in part, the observed toxicity of some flavonoids in-vivo.     

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

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。     

Eugenol with antioxidant activity inhibits MMP-9 related to metastasis in human fibrosarcoma cells

The oxidative damage of lipid, protein and DNA is known to be involved in chronic inflammation as well as metastasis. It has been highlighted for searching natural compounds without toxicity to prevent development of these diseases. Thus, it was investigated whether eugenol can inhibit matrix metalloproteinase (MMP) expression and activity as well as antioxidant effect. Eugenol was contained as a major ingredient in herbs such as clove and Magnoliae Flos. The direct scavenging effects of eugenol on DPPH radical, hydrogen peroxide, reducing power, lipid peroxidation and genomic DNA damage related to oxidative stress were evaluated in cell free system. It was observed that eugenol specifically exhibited higher inhibitory effect on hydrogen peroxide than other reactive oxygen species, and also blocked DNA oxidation and lipid peroxidation induced by hydroxyl radical. In addition, the inhibitory effects of eugenol on the activity and expression of MMP-9 activity related to metastasis were determined using gelatin zymography and western-blot. The data showed that it inhibited MMP-9 activities in PMA-stimulated HT1080 cells. Furthermore, it was found that eugenol exerts inhibitory effects on MMP-9 via inactivation of ERK. Therefore, these results suggest that eugenol could be available as an excellent agent for prevention of metastasis related to oxidative stress.     

两种新型卟啉化合物光动力体外抑癌作用的研究

目的:考察2种新型金属卟啉化合物(药物-A:四水合氯化-氯-二-2,2’-联吡啶(-5-吡啶基-10,15,20-三苯基卟啉)合钌(Ⅱ)(Ru(bpy)2TMPP)C12);药物-B:四水合氯化-氯-二-菲咯啉(-5-吡啶基-10,15,20-三苯基卟啉)合钌(Ⅱ)(Ru(phen)2TMPP)C12)),对人宫颈癌Hela细胞株的体外抗癌活性。方法:采用MTT法测定药物对Hela细胞增殖的影响;邻二氮菲-Fe2+氧化法测定药物对细胞清除羟自由基能力的影响;Giemsa染色法观察细胞形态学的改变。结果:药物-A、B抑制Hela细胞的最适宜条件为1×10-5mol/L培养48h并光照2h。随药物浓度升高肿瘤细胞的羟自由基清除能力相应下降,给光比避光作用更明显;Giemsa染色后光学显微镜下观察到给药后的细胞形态数目发生不同程度的变化,在最高浓度处可观察到大量细胞脱壁和细胞碎片浮起,凋亡细胞数量明显增多。结论:2种药物对Hela细胞均有杀伤作用,作用的强弱与给药的浓度和光照时间有关。