简介:目的:探讨癌基因表达的变化与辐射性细胞放射损伤的关系.方法:采用免疫组化技术检测人脑星形细胞瘤细胞系经X射线处理前后p53、c-myc、bcl-2基因表达的变化;采用原位杂交方法检测p53基因在mPNA水平表达的变化.结果:①处理组内p53、c-myc基因表达率明显高于对照组(P<0.001),bcl-2表达显著减弱(P<0.05),p53或c-myc与bcl-2基因表达呈显著性负相关(P<0.05).②处理组内p53在mRNA水平表达量明显高于对照组(P<0.05),p53基因在蛋白水平与mRNA水平表达呈显著性正相关(P<0.05),p53基因在蛋白水平与mRNA水平表达呈显著性正相关(P<0.05).结论:p53、c-myc和bcl-2基因在X线诱导的细胞损伤中起着重要的作用.本研究结果为脑胶质瘤的放射治疗和基因治疗提供了一条新线索.
简介:目的探讨脊髓挫伤部位的X线照射治疗对脊髓损伤后运动功能恢复的作用.方法将70只雌性Wistar大鼠按照纽约大学的重力冲击方法建立大鼠脊髓(T10)损伤动物模型,按照随机数字表法分为7组,每组10只,其中6组大鼠在损伤后不同时间(损伤后20min、1d、2d、4d、7d、17d)对挫伤部位进行X线(20Gy)照射,第7组则不予照射(对照组).然后根据Basso、Beattie、Bresnahan(BBB)评分标准评测各组大鼠运动功能恢复情况,并进行统计学比较.采用快蓝染色对存活6周以上的大鼠进行挫伤脊髓的组织形态学观察.结果脊髓挫伤后20min、1d、2d行X线照射组BBB评分明显高于对照组,差异均有统计学意义(P〈0.05),且在脊髓损伤后的2~3周进展较快,后期恢复缓慢.组织形态学观察可见应用X线治疗组周边组织残存区面积大于对照组.结论脊髓挫伤部位伤后早期行X线照射治疗可保护脊髓残存的神经组织,改善运动功能的恢复.
简介:X-irradiationhasabeneficialeffectintreatingspinalcordinjury.WesupposedthatX-irradiationcouldimprovethemicroenvironmentatthesiteofaspinalcordinjuryandinhibitglialscarformation.Thus,thisstudywasdesignedtoobservetheeffectsof8GyX-irradiationontheinjurysiteat6hoursand2,4,7,and14dayspostinjury,intermsofimprovementinthemicroenvironmentandhindlimbmotorfunction.ImmunohistochemistryshowedthattheexpressionofmacrophagemarkerED-1andtheareawithglialscarformationwerereduced.Inaddition,theBasso,BeattieandBresnahanscorewashigherat7dayspostinjuryrelativetotheothertimepointspostinjury.ResultsindicatedthatX-irradiationatadoseof8Gycaninhibitglialscarformationandalleviatetheinflammatoryreaction,therebyrepairingspinalcordinjury.X-irradiationat7dayspostspinalcordinjurymaybethebesttimewindow.
简介:HeavyionbeamswithhighlinearenergytransferexhibitmorebeneficialphysicalandbiologicalperformancethanconventionalX-rays,thusimprovingthepotentialofthistypeofradiotherapyinthetreatmentofcancer.However,thesetworadiotherapymodalitiesbothcauseinevitablebraininjury.TheobjectiveofthisstudywastoevaluatetheeffectsofheavyionandX-rayirradiationonthecytoskeletonandcytomechanicalpropertiesofratcorticalneurons,aswellastodeterminethepotentialmechanismofneuronalinjuryafterirradiation.Corticalneuronsfrom30new-bornmicewereirradiatedwithheavyionbeamsatasingledoseof2GyandX-raysatasingledoseof4Gy;subsequentevaluationoftheireffectswerecarriedoutat24hoursafterirradiation.AnimmunofluorescenceassayshowedthatafterirradiationwithboththeheavyionbeamandX-rays,thenumberofprimaryneuronswassignificantlydecreased,andtherewasevidenceofapoptosis.Radiation-inducedneuronalinjurywasmoreapparentafterX-irradiation.Underatomicforcemicroscopy,theneuronalmembraneappearedroughandneuronalrigidityhadincreased.ThesecellchangesweremoreapparentfollowingexposuretoX-rays.OurfindingsindicatedthatdamagecausedbyheavyionandX-rayirradiationresultedinthestructuraldistortionandrearrangementofthecytoskeleton,andaffectedthecytomechanicalpropertiesofthecorticalneurons.Moreover,thisradiationinjurytonormalneuronswasmuchsevererafterirradiationwithX-raysthanafterheavyionbeamirradiation.
简介:OBJECTIVE:ToevaluatetheassociationofX-raycross-complementinggroup1(XRCC1)Arg399Gln,Arg194TrpandArg280Hispolymorphismswiththeriskofglioma.DATASOURCES:AsystematicliteraturesearchofpaperspublishedfromJanuary2000toAugust2012inPubMed,Embase,ChinaNationalKnowledgeInfrastructuredatabase,andWanfangdatabasewasperformed.Thekeywordsusedwere"glioma","polymorphism",and"XRCC1orX-rayrepaircross-complementinggroup1".Referencescitedintheretrievedarticleswerescreenedmanuallytoidentifyadditionaleligiblestudies.STUDYSELECTION:Studieswereidentifiedaccordingtothefollowinginclusioncriteria:case-controldesignwasbasedonunrelatedindividuals;andgenotypefrequencywasavailabletoestimateanoddsratio(OR)and95%confidenceinterval(CI).Meta-analysiswasperformedfortheselectedstudiesafterstrictscreening.Dominantandrecessivegeneticmodelswereusedandtherelationshipbetweenhomozygousmutantgenotypefrequenciesandmutantgenefrequencyandgliomaincidencewasinvestigated.WechosethefixedorrandomeffectmodelaccordingtotheheterogeneitytocalculateORand95%CI,andsensitivityanalyseswereconducted.PublicationbiaswasexaminedusingtheinvertedfunnelplotandtheEgger’stestusingStata12.0software.MAINOUTCOMEMEASURES:AssociationofXRCC1Arg399Gln,Arg194Trp,andArg280Hispolymorphismswiththeriskofglioma,andsubgroupanalyseswereperformedaccordingtodifferentethnicitiesofthesubjects.RESULTS:Twelvearticleswereincludedinthemeta-analysis.ElevenofthearticleswereconcernedwiththeArg399Glnpolymorphismandgliomaonsetrisk.Significantlyincreasedgliomariskswerefoundonlyinthedominantmodel(Gln/Gln+Gln/ArgversusArg/Arg:OR=1.26,95%CI=1.03-1.54,P=0.02).Inthesubgroupanalysisbyethnicity,significantlyincreasedriskwasfoundinAsiansubjectsintherecessive(OR=1.46,95%CI=1.04-2.45,P=0.03)anddominantmodels(OR=1.40,95%CI=1.10-1.78,P=0.007),andhomozygotecontrast(OR=1.69,95%CI=1.17-2.45,P=0.005),bu
简介:目的探讨数字化成形钛网在颅骨缺损修补中的临床应用价值.方法回顾性分析66例采用钛网修补术治疗的颅骨缺损患者临床资料,并对其进行疗效评价.其中采用人工塑形钛网修补术15例;数字化成形钛网修补术51例,早期组(开颅术后3个月内)30例,晚期组(开颅手术6个月以后)21例.结果人工塑形钛网修补组手术时间,钛钉/骨窗面积比,术后恢复时间,术后皮下积血、积液及感染发生率均明显高于数字化成形钛网修补组,而满意度低于后者,差异有统计学意义(P<0.05).数字化成形钛网早期组术后1月神经功能改善率明显高于晚期组,差异有统计学意义(P<0.05).结论数字化成形钛网技术修复颅骨缺损的效果明显优于人工塑形技术,能有效提高塑形满意度,减少术后并发症.颅骨缺损患者早期行颅骨修补既能解除相关的精神负担,又可终止或逆转相关的继发性脑损害,改善神经功能,提高患者生活质量.
简介:BACKGROUND:Alpha-actinin(α-actinin)playsakeyroleinneuronalgrowthconemigrationduringdirectionaldifferentiationfromneuralstemcells(NSCs)toneurons.OBJECTIVE:Todetectinsitumicrodistributionandquantitativeexpressionofα-actininduringdirectionaldifferentiationofNSCstoneuronsinthetemporallobecerebralcortexofneonatalrats.DESIGN,TIMEANDSETTING:BetweenJanuary2006andDecember2008,cultureanddirectionaldifferentiationofNSCswereperformedatDepartmentofHistologyandEmbryology,PreclinicalMedicalCollege,ChinaMedicalUniversity.ImmuneelectronmicroscopywasperformedatDepartmentofHistologyandEmbryologyandDepartmentofElectronMicrology,PreclinicalMedicalCollege,ChinaMedicalUniversity.SpectrumanalysiswasperformedatLaboratoryofElectronMicroscopy,MentalResearchInstitute,ChineseAcademyofSciences.MATERIALS:Basicfibroblastgrowthfactor,epidermalgrowthfactor,brain-derivednervegrowthfactor,type-1insulinlikegrowthfactor,andα-actininantibodywereprovidedbyGibcoBRL,USA;rabbit-anti-ratnestinmonoclonalantibody,rabbit-anti-ratneuronspecificenolasepolyclonalantibody,andEDAX-9100energydispersiveX-rayanalysiswereprovidedbyPHILIPSCompany,Netherlands.METHODS:NSCs,followingprimaryandpassageculture,weredifferentiatedwithserumculturemedium(DMEM/F_(12)+10%fetalbovineserum+2ng/mLbrain-derivednervegrowthfactor+2ng/mLtype-1insulinlikegrowthfactor).MAINOUTCOMEMEASURES:Expressionofα-actinininneuron-likecellswasquantitativelyandqualitativelydetectedwithimmunocytochemistryusingenergydispersiveX-rayanalysis.RESULTS:Immunocytochemistry,combinedwithelectronmicroscopy,indicatedthatpositiveα-actininexpressionwaslikeaspheroidparticlewithhighelectrondensity.Inaddition,theexpressionwasgraduallyconcentratedfromthenuclearedgetothecytoplasmandexpandedintodevelopingneurites,duringdifferentiationofneuralstemcellstoneurons.Conversely,energydispersive
简介:目的探讨数字眼底照相技术在脑小血管病临床初筛中的应用价值,为脑小血管病在基层社区临床初筛提供依据。方法选取脑小血管病患者36例(72眼)为观察组,另选取30例(60眼)同期同年龄层非脑小血管病的志愿者为对照组。比较两组一般资料、眼底血管改变和颈动脉斑块等情况。结果观察组眼底动静脉交叉征率(77.78%vs23.33%)、眼底血管改变总发生率(88.89%vs56.67%)、眼底动脉硬化3级比例(30.56%vs0)均高于对照组(P〈0.001,P=0.003,P=0.002)。Logistic多元回归分析提示眼底动静脉交叉征是脑小血管病的重要危险因素[比值比(oddsratio,OR)10.678,95%可信区间(confidenceinterval,CI)2.943~38.742,P〈0.001]。观察组中有眼底血管改变者32例,无眼底血管改变者4例,有眼底血管改变者的颈动脉斑块发生率、颈动脉斑块数均较无眼底血管改变者高(P=0.010,P=0.013)。结论本研究中半数以上脑小血管病患者出现眼底动静脉交叉征,数字眼底照相技术或可作为脑小血管病在基层社区临床初筛常规手段之一。