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《酸敏感离子通道1α介导缺氧皮质神经元损伤及相关机制的探讨》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、维普资讯http://www.cqvip.com·516·JApoplexyandNervousDiseases,October2007,Vol24,No.5文章编号:1003—2754(2007)05—0516-04酸敏感离子通道1介导缺氧皮质神经元损伤及相关机制的探讨杜芸兰,孙继。,朱立菁,陈生弟。,孙家兰,陆国强。,江梅z摘要:目的探讨缺氧条件下阻断酸敏感离子通道la(acidsensingionchannelsla,ASICla)对大鼠皮质神经元存活及细胞内钙离子水平的影响,以及缺氧对皮质神经元A
2、SIC1表达的影响。方法通过使用ASICla阻断剂、N甲基D门冬氨酸(NMDA)受体阻断剂、电压门控通道阻断剂,利用fura一3/AM荧光显像,乳酸脱氢酶(1actatedehydrogenase,LDH)释放实验等技术,比较观察对缺氧皮质神经元存活以及钙离子水平的影响,进一步利用Western印迹法检测ASICI的表达变化。结果酸性环境中,缺氧皮质神经元形态明显改变,细胞内钙离子浓度升高;与加入NMDA受体阻断剂、电压门控通道阻断剂相比较,加入ASICla阻断剂明显抑制细胞内钙离子水平升高(尸3、),对神经元起到保护作用。随缺氧时间的延长,神经元ASIC1蛋白表达增加。结论酸性环境中,缺氧皮质神经元的损伤与ASICla开放以及表达增加有关;阻断ASICIa具有神经保护作用。关键词:缺氧;皮质神经元;酸敏感离子通道;钙中图分类号:Q735文献标识码:ACorticalneuronalinjurybyhypoxiamediatedthroughacid—sensingionchannellaanditsmechanismDYun—lan,SUNJian,ZHULi—qing,eta1.(Departm4、entofNeurology,GongliHospital,PuDongNewArea,Shanghai200135,China)Abstract:ObjectiveToinvestigatetheeffectsofacid—sensingionchannellaoncorticalneuronalsurvivalrateunderhypoxiaanditsintracellularcalciumlevel,andtheeffectofcorticalneuronunderhypoxiaonASIClaa5、N—pression.MethodsThevariationofsurvivalrateandcalciumconcentrationincorticalneuronalinjurybyhypoxiaweremeasuredviaLDHreleaseandfura一3/AMinthepresenceofantagonistsofASICla,NMDAandvoltage—gat—edCachannels.ExpressionofASIC1wasalsodetectedthroughWesternblot.6、ResultsSwellingandcelldeathoccurredafterhypoxiatreatmentandthelevelofintracellularcalciumsignificantlyincreased.Incomparisonwiththeeffectofvoltage—gatedCachannelandNMDAblockers。theblockadeofASIClacouldreducetheconcentra—tionofintracellularcalcium(尸<0.05)a7、ndprotecttheneurons.ExpressionofASIC1alsoincreasedashypoxiaimpairmentdeveloped,whichwasinpositivecorrelationwiththedynamicsofcellapoptosis.ConclusionThemechanismsofculturedratcorticalneuronsinjurebyhypoxiamaybeinvolvedbytheopeningandup—regulationofASICla.8、BlockingASlClaplaysaneuroprotectiverole.Keywords:Hypoxia;Corticalneuron;Acidsensingionchannels;Calcium缺血缺氧神经元损伤与细胞内钙超载密切相ASICl~、ASIC2a、ASIC2~3、ASIC3和ASIC4。其中A—关,关于其机制,过去认为谷氨酸等兴奋性氨基酸与SICla、ASIC2a主要在中枢神经系统表达,ASIClaNMD
3、),对神经元起到保护作用。随缺氧时间的延长,神经元ASIC1蛋白表达增加。结论酸性环境中,缺氧皮质神经元的损伤与ASICla开放以及表达增加有关;阻断ASICIa具有神经保护作用。关键词:缺氧;皮质神经元;酸敏感离子通道;钙中图分类号:Q735文献标识码:ACorticalneuronalinjurybyhypoxiamediatedthroughacid—sensingionchannellaanditsmechanismDYun—lan,SUNJian,ZHULi—qing,eta1.(Departm
4、entofNeurology,GongliHospital,PuDongNewArea,Shanghai200135,China)Abstract:ObjectiveToinvestigatetheeffectsofacid—sensingionchannellaoncorticalneuronalsurvivalrateunderhypoxiaanditsintracellularcalciumlevel,andtheeffectofcorticalneuronunderhypoxiaonASIClaa
5、N—pression.MethodsThevariationofsurvivalrateandcalciumconcentrationincorticalneuronalinjurybyhypoxiaweremeasuredviaLDHreleaseandfura一3/AMinthepresenceofantagonistsofASICla,NMDAandvoltage—gat—edCachannels.ExpressionofASIC1wasalsodetectedthroughWesternblot.
6、ResultsSwellingandcelldeathoccurredafterhypoxiatreatmentandthelevelofintracellularcalciumsignificantlyincreased.Incomparisonwiththeeffectofvoltage—gatedCachannelandNMDAblockers。theblockadeofASIClacouldreducetheconcentra—tionofintracellularcalcium(尸<0.05)a
7、ndprotecttheneurons.ExpressionofASIC1alsoincreasedashypoxiaimpairmentdeveloped,whichwasinpositivecorrelationwiththedynamicsofcellapoptosis.ConclusionThemechanismsofculturedratcorticalneuronsinjurebyhypoxiamaybeinvolvedbytheopeningandup—regulationofASICla.
8、BlockingASlClaplaysaneuroprotectiverole.Keywords:Hypoxia;Corticalneuron;Acidsensingionchannels;Calcium缺血缺氧神经元损伤与细胞内钙超载密切相ASICl~、ASIC2a、ASIC2~3、ASIC3和ASIC4。其中A—关,关于其机制,过去认为谷氨酸等兴奋性氨基酸与SICla、ASIC2a主要在中枢神经系统表达,ASIClaNMD
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