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1、星形胶质细胞在坐骨神经分支选择性结扎神经病理性痛中的作用【摘要】目的探讨星形胶质细胞在坐骨神经分支选择性结扎(sparednerveinjury,SNI)神经病理性痛中的作用。方法24只SD大鼠随机分为4组(6只/组):SNI组(建立SNI动物模型同时行鞘内置管术,术后13d鞘内给予生理盐水);假手术组(处理方式同SNI组,但不损伤坐骨神经及其分支);L,a,aminoadipate(LAA)组(制作SNI动物模型同时行鞘内置管,术后13d鞘内给予LAA);对照组(不给予任何处理因素)。术前2d及术后14d检测机械痛和神经病理性痛阈值
2、,术后14d以RealtimePCR法检测脊髓背角GFAPmRNA变化。结果术前2d各组大鼠机械痛域及热痛阈无明显差异(P>0.05)o术后14d假手术组机械痛域、热痛阈及脊髓背角GFAPmRNA较对照组均无明显变化(P〉0.05);与对照组相比,SNI组机械痛域及热痛阈明显降低(P【关键词】神经病理性痛;选择性结扎;星形胶质细胞Roleforastrocytesinsciaticnervesparednerveinjury(SNI),inducedneuropathicpainZHANGTao,CHENLei,ZHANGYi,lia
3、ng,etal.DepartmentofNeurology,HospitalofBeijingArmedPoliceCorps,Beijing100027,China【Abstract]ObjectiveToinvestigatetheroleforastrocytesinsciaticnervesparednerveinjury(SNI),inducedneuropathicpain・MethodsTwenty’fourmaleSDratswereassignedinto4groups(n二6/group):SNIgroup(sci
4、aticnerveweresparedinjuredandintrathecalimplantedforadministrationwithnormalsaline13dafteroperation),shamgroup(asSNIgrouptreatedexceptforsciaticnerveinjury),L,a,aminoadipate(LAA)group(asSNIgrouptreatedexceptforintrathecallyadministrationwithLAA),controlgroup(ratswerespa
5、redfortreatment).Mechanicalallodyniaandthermalhyperalgesiaweredetected2dbeforeoperationand14dafteroperation.Furthermore,fourteendaysafteroperation,alterationsofglialfibrillaryacidicproteininspinaldorsalhornweremeasuredatmRNAlevel.ResultsNodiffereneeofpawwithdrawalthresh
6、old(PWL)orthermalresponselatencies(TRL)couldbedetectedbetweengroups2dbeforeoperation(P>0.05).PWL,TRLandspinaldorsalhornGFAPmRNAinshamgroupshowednodiffereneetocontrolgroup14dafteroperation(P>0.05).PWLandTRLinSNIgroupweresign讦icantlydecreased,andspinaldorsalhornGFAPmRNAwa
7、sincreasedcomparedwithcontrolgroup14dafteroperation(P1.4分组及给药大鼠随机分组为4组(6只/组):SNI组(制作SNI动物模型,同时行鞘内置管术,术后13d鞘内给予生理盐水10UI);假手术组(仅暴露大鼠坐骨神经主干及其分支,不结扎切断,其余处理方式同SNI组);L,a,aminoadipate(LAA)组(制作SNI动物模型,同时行鞘内置管,术后13d鞘内给予LAA10Hl);对照组大鼠不施加任何处理因素。LAA药物配置:以生理盐水配制浓度为100nmol/10uIo1.5神经
8、病理性痛阈值的检测术前2d及术后14d进行疼痛阈值检测。检测热痛阈时将大鼠置于铁架的玻璃板上,罩以透明的有机玻璃罩,适应15min后测试。卤素投射灯从玻璃板下方照射足底,功率100W>电压10mV>光圈直径5mm0记录大