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1、Apelin對兩腎一夾高血壓大鼠離體主動脈環(huán)的舒張作用作者:莊紅,金戈,陳磊,楊鵬麟【摘要】目的:探討小分子活性肽Apelin-13對兩腎一夾(2K1C)高血壓大鼠離體主動脈環(huán)的舒張作用及意義。方法:①清潔級雄性SD大鼠27只,隨機(jī)分為正常對照組和2K1C高血壓模型組。測定平均頸動脈壓(mCAP)、左心重與體重比值(LVM/BW)以及右腎重/左腎重(RK/LK),以評價2K1C模型。②采用累計加藥法,觀察Apelin-13分別對用去甲腎上腺素(NE)預(yù)收縮的對照組大鼠和2K1C高血壓組大鼠離體胸主動脈環(huán)張力的作用。結(jié)果:①模
2、型組大鼠mCAP、LVM/BW和RK/LK分別較對照組高50.38%(P<0.01)、32.16%(P<0.01)和51.02%(P<0.01)。②Apelin-13在(10-11~10-7)mol·L-1濃度范圍內(nèi)對內(nèi)皮完整的兩組大鼠胸主動脈環(huán)具有濃度依賴性的舒張作用,且模型組舒張率高于對照組(P<0.05),而模型組與對照組EC50相比差異無顯著性(P>0.05)。結(jié)論:Apelin-13具有顯著的舒張主動脈的作用,并且對高血壓大鼠血管環(huán)的舒張作用更強(qiáng),提示Apelin-13在血管的保護(hù)作用
3、中扮演了重要角色?!娟P(guān)鍵詞】Apelin;主動脈;舒張作用;兩腎一夾;高血壓;腎性Abstract:Objective:ToinvestigatetheeffectofapelinonvasodilatationofisolatedthoracicaortaringsinratsoftwoKindeyone-cliprenalhypertensionanditssignificance.Methods:①Twenty-sevenmaleSprague-Dawley(SD)ratswithweightof150~180gwer
4、erandomlydividedintotwogroups,controlrats(n=12)wasestimatedandmodelratsoftwoKindeyone-clip(2K1C)renalhypertension(n=15).Then,themodelof2K1Crenalhypertensionbymonitoringthemeancarotidarterialpressure(mCAP),measuringtheratioofleftventricularmass(leftventricleplussept
5、um)tobodyweight(LVM/BW),andrightkidneytotheleft(RK/LK).②Isolatedaortaringswereperfusedandweregiventherestingtension.Then,theeffectsofaccumulatedApelin-13onaortaringswithendotheliuminpre-constrictedwithnorepinephrine(NE)wereobserved.Results:①ThemCAPandLVM/BWof2K1Cgr
6、oupwere50.38%and32.16%higherthanthoseofthecontrolgroup,respectively(P<0.01,P<0.01).AndtheratioofRK/LKinthe2K1Cgroupwas51.02%higherthanthatinthecontrolgroup(P<0.01).②Apelin-13wasapotentvasodilatatoronratthoracicaorta.Apelin-13at10-11~10-7mol·L-1causeddose-d
7、epenentvasodilatationinendotheliumintactringspre-constrictedwithNE.Responseofarteriesfromrenalhypertensionratswasincreased(P<0.05).ButthevaluesofEC50werenotsignificantlydifferent(P>0.05).Conclusion:Theseresults6indicatethatapelin-13relaxesthethoracicaortainth
8、etwogroupsandtheresponseofvasodilatationisenhancedintheratthoracicaortasfromthe2K1Chypertensiongroup.Itmaybeanimportantprotectingfactorandplayani