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:目的评估铁离子螯合剂去铁胺对老年颅脑损伤病人颅内血肿和水肿吸收的影响。方法收集90例经CT证实的老年创伤性颅内出血病人,经倾向评分匹配后分为实验组和对照组,每组45例。对照组病人接受常规治疗,实验组病人除常规治疗外,还接受连续5d去铁胺静脉注射,剂量20mg/kg,不超过2000mg/d。治疗当天及治疗后第3、7、14天分别评估去铁胺对脑水肿和血肿吸收的影响。结果治疗后第7天,实验组血肿体积为(5.50±3.60)ml,明显小于对照组的(9.10±6.32)ml,差异具有统计学意义(P=0.001);治疗当天及之后第3、14天两组间差异无统计学意义(P>0.05)。治疗后第7、14天,实验组的水肿体积均明显小于对照组(P<0.001)。两组病人治疗后6个月GOS评分差异无统计学意义(P>0.05)。结论去铁胺能加速老年颅脑损伤病人颅内血肿的吸收并抑制脑水肿,安全有效。
简介:目的探讨大鼠免疫细胞及免疫器官'固有胆碱能系统'的存在状态.方法用免疫荧光双标记、流式细胞技术及免疫组织化学技术,检测烟碱样乙酰胆碱受体α7亚单位(nAChRα7)和胆碱乙酰转移酶(ChAT),乙酰胆碱酯酶(AChE)在健康大鼠外周血CD4+T细胞、腹腔巨噬细胞、关节滑膜巨噬细胞及腹腔淋巴结的表达状态.结果nAChRα7、ChAT及AChE在大鼠免疫细胞及免疫器官均有阳性表达.腹腔巨噬细胞、淋巴结中的巨噬细胞和关节滑膜巨噬细胞表达最丰富,而腹腔淋巴结中的淋巴细胞仅有微弱表达;外周血CD4+细胞有部分表达(nAChRα715.88%±0.753%,ChAT23.09%±0.671%).结论免疫活性细胞及免疫器官普遍存在'固有胆碱能系统',淋巴细胞与巨噬细胞在机体固有胆碱能系统中扮演不同角色.
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