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ID:38190199
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页数:6页
时间:2019-05-24
《八肽胆囊收缩素对大鼠颈动脉窦神经传入放电的抑制作用》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2005年2月;19(1):18-23·18·ChinJPharmacolToxicol2005Feb;19(1):18-23InhibitoryeffectofcholecystokininoctapeptideoncarotidsinusnerveafferentdischargeinanesthetizedratsLIUYiXian,ZHANGHao,DONGJingHui,LIQian,HERuiRong(DepartmentofPhysiology,InstituteofBasicMedicine,HebeiMedic
2、alUnivesity,Shijiazhuang050017,China)Abstract:AIMTostudyifcholecystokininoctapeptidephysiologicalrolesasaneurotransmitterandpep(CCK8)altercardiovascularfunctionsbyitsdirectintidehormoneinthecentralnervoussystemandpehibitoryeffectoncarotidsinusbaroreceptor(CSB)activi[1]ripheral
3、organs.Accumulatingevidencesindity.METHODSThefunctionalcurveofcarotidbarorecatethatCCKexertsitseffectsviatwodistinctceptor(FCCB)wasconstructedandthefunctionalparamsubtypesofreceptors:CCKAandCCKBrecepetersofcarotidbaroreceptorweremeasuredbyrecording[2]sinusnerveafferentdischar
4、geinanesthetizedmaleratstors.Theformerpredominatesinperipheralorwithperfusedisolatedcarotidsinus.RESULTS①gans,whilethelatterdistributeswithinbrain-1CCK80.1,0.5and1.0μmol·LshiftedFCCBtothemainly.Previousstudiespaidmoreattentionstorightanddownward,withamarkeddecreaseinpeakeffectsof
5、CCKongastrointestinalsystem,howevslopeandpeakintegralvalueofcarotidsinusnervediser,increasingstudieshavefocusedonitscardiochargeinaconcentrationdependentmanner,indicatingvascularfunctionsinrecentyears.CholecystokinintheinhibitoryeffectofCCK8onCSBactivity.②Pretreatmentwithprog
6、lumide(100μmol·L-1),anonselecoctapeptide(CCK8)isanactivefunctionalfragtiveCCKreceptorantagonist,orBayK8644(0.5μmol·mentofCCK,whichcanaltercardiovascularfunc-1),anagonistofcalciumchannel,partiallyattenuatedtionsinconsciousoranesthetizedanimals.IntraL-1)onCSBtheinhibitoryeffecto
7、fCCK8(0.5μmol·LvenousinjectionofCCK8inconsciousratscauses-1),activity.PretreatmentwithLNAME(100μmol·Lpressorresponsesinadosedependentmanner.aninhibitorofNOsynthase,didnotaffecttheinhibitoryLowdoseofCCK8resultsintachycardia,whileactionofCCK8.CONCLUSIONCCK8inhibitsCSBhighdoseo
8、fCCK8elicitsabradycardiaf
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