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页数:11页
时间:2018-11-10
《当归对宫内缺氧幼年大鼠海马ca3区神经元与学习能力的影响及机制》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、当归对宫内缺氧幼年大鼠海马CA3区神经元与学习能力的影响及机制作者:贺艳赵峰马晶余鸿【摘要】目的探讨宫内缺氧对幼年大鼠海马CA3区神经元与学习能力的影响,以及NMDAR1mRNA在其新生期的表达与当归的调控作用。方法健康SD孕鼠30只,随机分为对照组、缺氧组和当归组各10只,于孕14d开始将缺氧组与当归组孕鼠用三气培养箱制作胎鼠宫内缺氧模型,当归组用250g/L当归静脉注射干预。3组孕鼠分娩当日每窝随机选取新生鼠2只,取脑、常规石蜡切片;余新生鼠随机选取2只喂养至30d进行Morris水迷宫测试,测试
2、结束当日,多聚甲醛灌注固定取脑、常规石蜡切片。幼鼠脑组织作NSEmRNA原位杂交、新生鼠脑组织作NMDAR1mRNA原位杂交。结果Morris水迷宫实验和NSEmRNA原位杂显示:与对照组(n=20)相比,缺氧组幼鼠(n=20)空间探查测试和对位探查测试时间较缩短、海马CA3区阳性细胞数减少(P<0.05),当归组(n=20)探查测试时间较缺氧组延长(P<0.05)、海马CA3区阳性细胞数增多(P<0.05);NMDAR1mRNA原位杂交显示:与对照组相比,缺氧组海马CA3区阳性细胞
3、积分光密度值增大,当归组较缺氧组减小(P<0.05)。结论宫内缺氧可致新生大鼠海马CA3区NMDAR1mRNA表达增高,从而使幼年大鼠该区神经元减少,学习记忆能力降低,而当归注射液可改善宫内缺氧状态,增加幼年大鼠海马CA3区神经元数量,提高其学习记忆能力。【关键词】海马;学习能力;N-甲基-D-天门冬氨酸受体1;缺氧;当归 Abstract:ObjectiveToexploretheeffectofintrauterinehypoxiaonhippocampalCA3areaneuronsan
4、dlearningcapacityofjuvenilerats,andtoexploretheexpressionofN-methy-D-aspartatereceptor-1(NMDAR1)inhippocampalCA3areaofneonatalratsfolloechanismofAngelicasinensis.MethodsThirtyhealthypregnantSDratslyintocontrolgroup,hypoxiagroupandAngelicagroup.Hypoxiagr
5、oupandAngelicagrouppregnantratsadetheintrauterinehypoxiamodeloffetalratsthebeginningofpregnant14thday,andtheratsofAngelicagrouplyfromeachlittertotakethebraintissue,makeparaffinsectionsconventionly.TlyfromtheothersineachlittertoperformofMorrisazeafterthe
6、30thdayofbirth,andperfusedparaformaldehydeattheendofthelastday,tookthebraintissueofjuvenilerats,andparaffinsectionsconventionly.TheexpressionofNSEmRNAandNMDAR1mRNAeofprobetrialandreveralprobetrialinthetargetquadrant,andthequantityofpositiveNSEmRNAcellsi
7、nhyppocampalCA3areaorethanthatofhypoxiagroup(P<0.05).Theintegralopticaldensity(IOD)valueofpositiveNMDAR1mRNAcellsinhippocampalCA3areainhypoxiagroupneontalrats(n=20)RNAinhippocampaldentategyrusofneontalrats,thusreducedthequantityofhippocampaldentategy
8、rusneuronsandlearning-memorycapacityofjuvenilerats,provetheintrauterinehypoxiccondition,thusincreasethequantityofhippocampaldentategyrusneuronsandlearning-memorycapacityofjuvenilerats. Keypus;Learningcapacity;NMDAR1;Hypoxia;Ange
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