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ID:38189733
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页数:5页
时间:2019-05-24
《N-甲基小檗胺对大鼠肠系膜阻力血管平滑肌细胞钙激活钾电流的作用》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、中国药理学与毒理学杂志2004年6月;18(3):166-170·166·ChinJPharmacolToxicol2004Jun;18(3):166-170EffectofNmethylberbamineoncalciumactivatedpotassiumcurrentsinratmesentericresistancevascularsmoothmusclecellsHANDongYun,LIJinMing,CHENLei,NIEHongGuang,SONGZhiGuo,LIUDongMei(DepartmentofPharmacology,ChinaMedicalUn
2、iversity,Shenyang110001,China)Abstract:AIMToinvestigatetheionicmechanismofmyocardiocyteisolatedfromguineapigs.HowevNmethylberbamine(NMB)onloweringbloodpressureer,theionicmechanismforloweringbloodpresbyrecordingcalciumactivatedpotassiumcurrents(IK·Ca)surehasnotbeenfullyelucidated.Thepresentinthe
3、ratmesentericresistancevascularsmoothmusclestudyistoobservetheeffectofNMBoncalciumcells.METHODSUsingstandardwholecellrecordingmethod.RESULTSAtpotentialof+60mV,NMBactivatedpotassiumcurrents(IK·Ca)intherat0.1,1and10μmol·L-1activatedIfrompretreatsmoothmusclecellsisolatedfromA4-A5branchK·Cament(33.6
4、±2.0)pA·pF-1to(35.7±1.9),(42.9±esofthemesentericarteryusingpatchclamptech-1(n=6cellsfrom62.7)and(59.4±1.4)pA·pFniqueunderthestandardwholecellconfiguration.rats,P<0.01),respectively.CONCLUSIONNMBcouldincreaseIK·Caintheratmesentericresistancevas1MATERIALSANDMETHODScularsmoothmusclecells,whichmayb
5、eoneofthemechanismsofloweringbloodpressure.1.1IsolationofsinglearterialsmoothmuscleKeywords:Nmethylberbamine;patchclamptechcellnique,wholecell;potassiumchannels;muscle,smooth,MaleorfemaleWistarrats(230-270)g,vascularsuppliedbyLaboratoryAnimalCenter,ChinaCLCnumber:R972MedicalUniversity,wereanesth
6、etizedbyipinjecDocumentcode:Ationof10%chloralhydrate(4mL·kg-1).TheArticleID:10003002(2004)03016605A4-A5branchesofmesentericarteryweredissectedoutandplacedinphysiologicsaltsolutionNmethylberbamine(NMB)isadibenzyl(PSS).TheconnectivetissueswerecarefullyreisoquinolinealkaloidisolatedfromaChines
7、emovedandthecleanedvesselswerecutintosmallplant,BerberispoiretiiSchneid.Itschemicalpieces.Thentheywereincubatedfor20minin2structureissimilartoberbamine.Theprevious2+-1mLCafreePSScontaining1.5g·Lpapainstudi
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