简介:目的探讨MMP-2和TIMP-2与胶质瘤侵袭性及恶性表型之间的关系及其意义.方法采用Elivision二步免疫组织化学法染色观察MMP-2和TIMP-2在46例不同恶性度胶质瘤及10例正常脑组织中的表达并用德国LeicaQ550cw图像分析系统测其灰度值作为表达强度的量化指标.结果在对照组、低度及高度恶性胶质瘤中,MMP-2的阳性表达率分别为10%、63.6%和95.8%;在对照组、低度及高度恶性胶质瘤中,TIMP-2的阳性表达率分别为10%、36.3%和37.5%.MMP-2在Ⅰ、Ⅱ级和Ⅲ、Ⅳ级胶质瘤中平均灰度值分别为173.27±13.26和98.63±18.20;TIMP-2在Ⅰ、Ⅱ级和Ⅲ、Ⅳ级胶质瘤中平均灰度值分别为210.44±12.95和205.65±9.75.结论MMP-2表达随胶质瘤恶性程度增加而增强,可作为胶质瘤恶性表型及侵袭性指标之一.TIMP-2表达在正常脑组织及不同级别胶质瘤中无明显差异.MMP-2/TIMP-2的比值与胶质瘤侵袭性密切相关.
简介:RolesofKeap1-Nrf2pathwayinbrain:NeuronalsurvivalandneurogenesisareimpairedinneurodegenerativediseasessuchasParkinson’sdiseaseandAlzheimer’sdisease(Winneretal.,2011).Geneticup-regulationofgrowthfactorsenhancedneuronalsurvivalandneurogenesis,improvedneuronalfunctionsandhalteddiseaseprogressioninanimalmodelsofAlzheimer’sdisease
简介:目的探讨人脑星形细胞瘤发生发展中相关基因及分类特征基因的表达。方法用含13939种人基因的BioStarH140S芯片,以正常脑及18例胶质瘤组织总RNA制备的探针杂交芯片,ScanArray4000扫描信号,提取脑及不同级别星形细胞瘤的差异基因并行生物信息分析,Hierarchical聚类提取差异基因的特征。结果星形细胞瘤中筛选出438条(3.14%)差异表达基因;信息分析与细胞信号、细胞骨架和运动、癌基因及抑癌基因等多类基因密切相关;与分类相关的特征基因有MAP7、DBCCR1、PCDHA5、KCNAB1、NAPIL2等。表达谱将星形细胞瘤分成两类,与临床组织病理分类基本一致。结论芯片是基因分析和筛选肿瘤标志性基因的有效手段,可客观分析星形细胞瘤发展及预后;分类特征基因为星形细胞瘤侵袭性和预后判断提供依据,有助于临床诊治。
简介:BACKGROUND:Mailuoning,aChineseherb,hasbeenwidelyusedinChinatotreatacuteischemicstroke,andthemajorcomponentexhibitsanti-oxidativeeffects.However,thepreciseanti-oxidationpathwayremainsuncertain.OBJECTIVE:TovalidatetheprotectiveeffectsofMailuoningonH2O2-inducedprimarycorticalneuroninjuryinembryonicmice.DESIGN,TIMEANDSETTING:ComparativeobservationandinvitroexperimentswereperformedattheJiangsuKeyLaboratoryforMolecularMedicinefromJanuary2008toSeptember2009.MATERIALS:Mailuoning(NanjingJinlingMedicalCompany,China),reactiveoxygenspecies(ROS)kit(BeyotimeBiotechnology,China),superoxidedismutase(SOD),Cu/ZnSODkit,malondialdehyde(MDA)kits(NanjingJiancheng,China),mitochondrialmembranepotential(GMS10013.1,GENMED,USA)andcatalaseactivityassaykit(BeyotimeBiotechnology,China)wereutilizedforthepresentstudy.METHODS:MouseembryoniccorticalneuronswereisolatedandculturedwithculturemediumcontainingH2O2(80μmol/L)and/orMailuoning(1.25μg/mL)for24hours.MAINOUTCOMEMEASURES:Neuronalviabilityanddeathweredetectedbymethylthiazolyltetrazdiumandflowcytometry;ROSproductionwasdeterminedbyflowcytometry;mitochondrialmembranepotentialwasdetectedusingfluorescentstaining;SODactivitywasdetectedusingamodifiednitrobluetetrazoliummethod;Cu/ZnSODandcatalaseactivitywasdetectedbyspectrophotometry;andMDAwasdeterminedusingthelipidperoxidationmethod.RESULTS:H2O2increasedROSproductionandMDAconcentration(P<0.05),anddecreasedmitochondrialmembranepotential,SOD,Cu/ZnSODandcatalaseactivity(P<0.05);thenumberofsurvivingneurons(P<0.05)wasalsoreduced.Mailuoningreversedthesechanges.CONCLUSION:MailuoningprotectsH2O2-inducedinjuryincorticalcellsbyinhibitingROSandMDA,increasingdepolarizationofmitochondrialmembrane,andenhancingSODandcatalaseactivity.
简介:目的研究刺五加多糖(ASPS)对H2O2诱导的海马神经元凋亡的影响及其机制。方法采用H2O2诱导大鼠海马神经元凋亡。采用末端脱氧核苷酸转移酶介导的dUTP原位切口末端标记法检测细胞凋亡率、免疫组化法检测caspase-3蛋白的表达、逆转录PCR法检测caspase-3mRNA的表达。结果H2O2作用后,海马神经元凋亡率、caspase-3蛋白和mRNA表达水平均显著增高(P〈0.05);给予ASPS干预后,均显著下降(P〈0.05);而且,随ASPS剂量增加,作用效果显著增强(P〈0.05)。结论ASPS具有抑制氧化应激损伤诱导神经细胞凋亡作用,其机制与下调caspase-3mRNA的表达有关。
简介:Thismini-reviewpresentstheauthors'visiononthecurrentstatusandfuturetrendsinthedevelopmentofneuroprotectiveagentsworkingviaactivationofnuclearfactorerythroid2-relatedfactor2(Nrf2),andinparticular,viadisruptionofNrf2-Keaplinteraction.Therearetwoopposite'chemical'mechanismsunderlyingsuchactivation:thefirstoneisanon-specificcovalentmodificationofKeap1thiols,resultinginsideeffectsofvariedseverity,andthesecondoneistheshiftoftheNrf2-Kelch-likeECHassociatedprotein-1(Keap1)bindingequilibriuminthepresenceofacompetitiveandchemicallybenigndisplacementagent.Atthispoint,nodisplacementactivatorsexhibitsufficientbiologicalactivityincomparisonwithcommonNrf2activatorsworkingviaKeaplthiolmodification.Hence,thehopeintherapeuticsisnowlinkedtotheFDAapproveddimethylfumarate,whosederivative,monomethylfumarate,aswedemonstratedrecently,ismuchlesstoxicbutequallybiologicallypotentandanidealcandidateforclinicaltrialsrightnow.AnewlyemergingplayerisanuclearinhibitorofNrf2,BTBdomainandCNChomolog1(Bach1).ThecommerciallydevelopedBachlinhibitorsarecurrentlyunderinvestigationinourlaboratoryshowingpromisingresults.Inourviewpoint,theperfectfuturedrugwillpresentthecombinationofadisplacementactivatorandBachlinhibitortoinsuresafetyandefficiencyofNrf2activation.
简介:目的采用反映血管新生状态的指标经模糊C均值聚类对星形细胞肿瘤病理学分级进行探讨。方法采用含有正常成人脑组织、弥漫性星形细胞瘤(WHOⅡ级)、间变性星形细胞瘤(WHOⅢ级)、胶质母细胞瘤(WHOⅣ级)及阳性对照组织的168点矩阵的组织芯片,通过免疫组织化学SABC双标法标记内皮细胞和血管内皮生长因子,以Image-ProPlus5.1中文版图像分析软件对染色结果及血管内皮生长因子阳性单位、微血管密度及微血管平均周长等指标进行测定。采用单因素分析方法筛选与星形细胞肿瘤病理级别相关的参数,以矩阵实验室数学软件提供的模糊C均值聚类函数参数作为聚类对象,将不同的组织切片参数值进行模糊C均值聚类,所得聚类值分别赋值为星形细胞肿瘤病理分级值。结果(1)在不同病理分级组之间,星形细胞肿瘤血管内皮生长因子阳性单位差异具有统计学意义(P=0.000),各病理分级组间两两比较差异亦有统计学意义(均P〈0.05)。(2)在不同病理分级组之间,星形细胞肿瘤微血管密度值差异有统计学意义(P=0.000),两两比较差异亦有统计学意义(均P=0.000)。(3)星形细胞肿瘤微血管平均周长,Ⅱ级组与Ⅲ级组、Ⅱ级组与Ⅳ级组比较差异有统计学意义(均P=0.000),而Ⅲ级组与Ⅳ级组之间差异无统计学意义(P=1.000)。(4)与WHO病理分级相比,模糊C均值聚类产生的星形细胞肿瘤病理分级值对Ⅱ、Ⅲ、Ⅳ级等级别的诊断符合率分别为85.71%、48.39%和78.95%,总体正确率达68.46%。结论星形细胞肿瘤血管内皮生长因子阳性单位、微血管密度和微血管平均周长等项指标的模糊C均值聚类值与星形细胞肿瘤病理分级值比较符合,可应用模糊C均值聚类法对星形细胞肿瘤的病理分级进行辅助推测。
简介:苯妥英(PHT)为临床上最常用的第一线抗癫痫药,但个体间对PHT代谢呈现较大差异.目前证实细胞色素氧化酶P450(CYP)2C9/19是体内参与PHT羟化的主要代谢酶.人群CYP2C9/19遗传基因呈多态性,从而引起对PHT代谢个体间较大差异,部分人群对PHT呈强代谢(EM),另一部分人群呈弱代谢(PM),了解这些知识对临床用药十分重要.本文试对该方面内容进行综述.
简介:BACKGROUND:ElectrophysiologycanprovetheintegrationofafferentinformationfromthestomachmeridianofFoot-Yangminginthenucleustractussolitarius(NTS)andobjectivelydescribethespecificassociationbetweenmeridianvesselsandZangFuorgans.OBJECTIVE:ToinvestigatetheeffectsofafferentinformationfromacupunctureatSibai(ST2)acupointonneuronaldischargeinratNTS.DESIGN,TIMEANDSETTING:Arandomized,controlled,animalexperimentwasperformedattheKeyLaboratoryofMeridian-VesselsandZangFuOrgans,TraditionalChineseMedicineUniversityofHunan,StateAdministrationofTraditionalChineseMedicine,andKeyLaboratoryofAcupuncture,Moxibustion,andtheBiologicalInformationofHunanHigherEducationInstitutes,betweenDecember2005andOctober2008.MATERIALS:Atotalof52SpragueDawleyrats,ofeithergender,aged4months,wereincludedinthisstudy.Acupunctureneedlesof0.32mm(diameter)×40mm(length)wereused.METHODS:Anextracellularrecordingprotocolwasapplied.TheSibai(ST2)acupointinthestomachmeridianofFoot-Yangmingwasusedasanacupuncturepoint(acupoint).Simultaneously,Dicang(ST4)andNetting(ST44)acupointsinthestomachmeridianofFoot-Yangming,Quanliao(SI18)acupointinthesmallintestinemeridianofHand-Taiyang,andanon-acupointlateraltoSibai(ST2)acupoint,wereselectedascontrols.TheSibai(ST2)acupointwasstimulatedfor30seconds,byhandacupuncturethroughtwirlingandrotating,todeterminetheneuronsrespondingtobodysurfacestimulationintheNTS.MAINOUTCOMEMEASURES:FrequencyofrespondingNTSneuronsafteracupunctureatfouracupointsincludingSibai(ST2),Dicang(ST4),Neiting(ST44)andQuanliao(SI18)andonenon-acupoint.RESULTS:ThefrequencyofrespondingNTSneuronswassignificantlyhigherafteracupunctureatSibaithanatcontrolsitesincludingtheDicang(ST4),Netting(ST44)andQuanliao(SI18)acupointsandatthenon-acupoint(P<0.01).ThefrequencyofrespondingNTSneuronsatDicang(ST4)andQuanliao(SI
简介:目的探讨人类垂体腺瘤发生、发展中相关基因的表达与功能.方法应用人全基因组寡核苷酸芯片HG-U133A2.0检测8例垂体腺瘤组织(生长激素腺瘤、泌乳素腺瘤、促性腺激素腺瘤以及裸细胞激素腺瘤各2例)和2例混合的正常垂体组织的基因表达谱.差异表达基因进行筛选和生物信息学分析.芯片结果予以qRT-PCR验证.结果与正常对照组比较,与垂体腺瘤发生关联的基因功能上主要涉及分子结合、凋亡或肿瘤相关、代谢、信号传导、细胞周期、物质运输等多个牛物过程.数个差异基因的表达特异性与亚类腺瘤的发展相关.结论垂体腺瘤的发生、发展是一多基因、多分子、多通路的网络调控过程.但对于各亚类腺瘤,其分子机制不尽相同.