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1、APOE基因亚型及其短肽COG1410对神经细胞损伤后早期凋亡的影响江涌1,2,孙晓川2,陈礼刚1,郐莉(646000四川泸州,泸州医学院附属医院神经外科1;400016重庆,重庆医科大学附属第一医院神经外科2)[摘要]目的探讨载脂蛋白E(APOE代表基因,apoE代表蛋白)亚型特异性及其短肽与早期凋亡的相关性,以期明确APOE亚型影响脑创伤病情转归及预后的病理机制。方法采用稳定表达人APOE各等位基因的APOE敲除鼠的神经干细胞,优化诱导分化条件,构建神经元/胶质细胞共培养体系及细胞划痕损伤模型。通
2、过AnnexinV/PI联合流式细胞技术检测损伤后各组细胞早期凋亡率,分析人APOE各等位基因及其短肽影响继发性神经细胞损伤的差异。结果成功构建携带人源性APOE各亚型的细胞划痕损伤模型;伤后24h时间点各组细胞早期凋亡率较6、12h明显增高(P<0.05),且人APOEε4组较其余亚型组早期凋亡率明显增高(P<0.05)。在24h时间点apoE短肽COG1410可显著降低各亚型组早期凋亡率(P<0.01)。结论转染人APOEε4的细胞早期凋亡率高于其他亚型细胞组,提示APOEε4携带者可能通过早期凋
3、亡导致脑创伤急性期病情加重。而apoE短肽COG1410可通过降低早期凋亡发挥神经保护作用。[关键词]载脂蛋白E;短肽;创伤性脑损伤;体外模型;早期凋亡[中图法分类号][文献标志码]ATheeffectofAPOEallelesandapoE-mimeticpeptideCOG1410ontheearlyapoptosisafterexperimentaltraumaticbraininjuryJiangYong1,2,SunXiaochuan2,ChenLigang1,GuiLi1(1Departm
4、entofNeurosurgery,theAffiliatedHospitalofLuzhouMedicalCollege,Luzhou,646000;2DepartmentofNeurosurgery,theFirstAffiliatedHospitalofChongqingMedicalUniversity,Chongqing400016,China)[Abstract]ObjectiveToelucidatethemechanismmediatingtheeffectsofapolipoprot
5、einE(APOE=gene,apoE=protein)allelesandapoE-mimeticpeptideCOG1410onearlyapoptosisinanexvivomodelofexperimentaltraumaticbraininjury.MethodsEukaryoticexpressionvectorscarryingindividualAPOEalleles(ε2,ε3,ε4)weretransferredintoneuralstemcells(NSCs)derivedfro
6、mAPOEknockoutmice.Anexvivoneuronal/glialco-culturemodelofmechanicalinjurywasdevelopedusingacontrolledscratch.FlowcytometrywasperformedtoanalyzethecorrelationsamongAPOEgenotypes,apoE-mimeticpeptideCOG1410andearlyapoptosis.ResultsEarlyapoptosisafterinjury
7、wasobservedinallgroups,whichwassignificantlyhigherat24hafterinjurythanat6hor12hafterinjury(P<0.05).ThegrouptransfectedwithAPOEε4showedmoresignificantearlyapoptosis24hafterinjuryascomparedtothegroupstransfectedwithAPOEε2orAPOEε3(P<0.05).Furthermore,decre
8、asesofearlyapoptosisweredetectedinthegroupstreatedwithapoE-mimeticpeptideCOG1410at24hafterinjury(P<0.01).ConclusionAPOEε4-trasfectedNSCsshowingahigherrateofearlyapoptosisindicatesthatthepatientswithAPOEε4maysufferaggravationofbra