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时间:2019-03-06
《不同强度磁刺激对星形胶质细胞迁移的影响及其机制研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、童堕堂.皇壁复盘查生!旦箜鲞笙塑in羔sMedRehabil,April2010,Vo1.32,N。.4·249·.基础研究不同强度磁刺激对星形胶质细胞迁移的影响及其机制研究李哲方征宇黄晓琳【摘要】目的研究不同强度磁刺激对星形胶质细胞迁移作用的量效关系,探讨其作用机制。方法24只sD大鼠按刺激强度被随机分为A(0T)、B(1.9x40%T)、C(1.9×80%T)、D(1.9x100%T)4组.4组的刺激频率均为lHz,刺激量为3O个脉冲,均采用溴已锭(EB)注入脊髓左侧背索复制局灶性的脊髓损伤模型。刺激后第14天,处死大鼠,采用图像分析系统观察胶质纤维酸性蛋白(GFAP)、微管相关蛋门一
2、2(MAP一2)和细胞外信号调节激酶1/2(ERK1/2)的表达及脊髓损伤区空洞体积的变化。结果随着磁刺激强度的增加,在第l4天时空洞的体积逐渐缩小,组问差异具有统计学意义(P<0.05)。存空洞缩小的区域中,可以观察到GFAP,ERK1/2的阳性表达,而无MAP一2的阳性表达。随着磁刺激强度的增加,GFAP,ERK1/2的阳性表达亦显著增强(P<0.05)。结论磁刺激可影响星形胶质细胞的迁移,并随着刺激强度的增强,星形胶质细胞迁移的能力亦增强,这可能与ERK1/2的高表达有关。【关键词】磁刺激;星形胶质细胞;迁移Theeffectofmagneticstimulationonastroc
3、ytemigrationanditsmechanismLIZhe,FANGZheng—yu,HUANGXiao—lin.DepartmentofRehabilitation,TongjiHospital,HuazhongUniversityofScienceandTechnology,Wuhan430030,ChinaCorrespondingauthor:HUANGXiao—lin,Email:xiaolinhuang2006@163.corn【Abstract】ObjectiveToinvestigatetheeffectofmagneticstimulationonastrocyte
4、migrationanditsmeeh—anism.MethodsTwenty-fouradult,healthySprague—Dawleyratswereinjectedwith0.5lof1%ethidiumbro—mide(EB)intheleftsideofthedorsalspinalcordfuniculusattheT1(1_】Ileveltomakealocalspinalcordinjurymod—e1.Theywerethenrandomlydividedintofourgroupsandexposedto30pulsesofmagneticstimulationat
5、1Hzandthefollowingintensities:0T(GroupA);1.9×40%T(GroupB);1.9×80%T(GroupC);1.9×100%T(GroupD).Onthe14thdayafterstimulation,theratsweresacrificedandtheexpressionofglialfibrillaryacidicprotein(GFAP),nfierotubuleassociatedprotein一2(MAP一2)andextracellularsignal—regulatedkinase1/2(ERK1/2)weredetected,an
6、dthevolumeofholesintheinjuredareaofthespinalcordwasmeasured.QuantitativeanalysisoftheGFAP,MAP一2andERK1/2expressionwasperformedusingimmunohistochenfistryandanimageanal—ysissystem.ResultsThevolumeofholesintheinjuredareaofthespinalcorddecreasedwithincreasingstimula·tionintensity.Inthereducedareaofthe
7、holes,theexpressionofGFAPandERK1/2couldbeseen,butnotMAP-2.SignificantdiferenceswererevealedintheexpressionofGFAPandERK1/2amongthefourgroups,butitwasalwayssignificantlyhigherinthemagneticstimulationgroupsthaninthe
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