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1、PI3K/Akt通路在硫化氫后處理保護(hù)心肌細(xì)胞缺氧-復(fù)氧損傷中的作用李鋼,楊雙強(qiáng)(400016重慶,重慶醫(yī)科大學(xué)附屬第一醫(yī)院胸心外科)[摘要]目的探討硫化氫后處理對(duì)原代培養(yǎng)的新生大鼠心肌細(xì)胞缺氧復(fù)氧損傷的保護(hù)作用及可能機(jī)制。方法以硫氫化鈉(NaHS)作為外源性硫化氫供體。原代培養(yǎng)新生大鼠的心肌細(xì)胞隨機(jī)分為5組:①正常對(duì)照組(CON組),②缺氧-復(fù)氧組(Hypoxia-reoxygenation,HR組),③二甲基亞砜組(Dimethylsulfoxide,DMSO組),④硫化氫后處理組(Hydrogensulfid
2、e,H2S組),⑤LY294002+H2S后處理組(LY+H2S組)(n=6)。分別于缺氧前和復(fù)氧2h檢測(cè)各組的心肌細(xì)胞存活率、培養(yǎng)液中CK和LDH的活性;復(fù)氧末,用流式細(xì)胞學(xué)技術(shù)檢測(cè)各組心肌細(xì)胞凋亡情況;Westernblot檢測(cè)HIF-1α、p-Akt與Akt蛋白的表達(dá)情況。結(jié)果通過比較缺氧前與復(fù)氧2h差值可知,復(fù)氧2h時(shí),H2S組心肌細(xì)胞存活率較HR組升高顯著[(27.37±2.11)vs(36.42±2.3),P<0.01],CK、LDH活性以及心肌細(xì)胞凋亡率明顯降低[(98.45±24.59)vs(193
3、.55±46.98),(144.52±20.10)vs(201.66±21.37),(10.37±1.51)vs(17.38±2.04),均為P<0.01];同時(shí),HIF-1α和p-Akt蛋白表達(dá)水平明顯升高[(63.93±4.64)vs(41.82±6.14),(62.59±2.11)vs(41.04±4.01),均為P<0.01]。然而,在H2S后處理同時(shí)加入PI3K/Akt信號(hào)通路特異性抑制劑LY294002后,與H2S組相比,心肌細(xì)胞存活率降低明顯(34.45±3.34),CK、LDH活性以及心肌細(xì)胞凋亡率
4、升高顯著[(173.69±30.34,(197.38±18.21),(15.17±1.56)均為P<0.01],并且,HIF-1α和p-Akt蛋白表達(dá)水平亦降低明顯[(51.79±4.27),(47.42±3.15),分別為P<0.05和P<0.01]。結(jié)論H2S后處理可通過PI3K/Akt信號(hào)通路促進(jìn)HIF-1α表達(dá),從而拮抗心肌細(xì)胞的缺氧復(fù)氧損傷。[關(guān)鍵詞]硫化氫;心肌缺血再灌注損傷;缺氧誘導(dǎo)因子1α;凋亡;PI3K/AktHydrogensulfidepostconditioningprotectscardi
5、omyocytesagainsthypoxia-reoxygenationinjuryviaPI3K/AktpathwayLiGang,YangShuangqiang(DepartmentofCardiothoracicSurgery,theFirstAffiliatedHospital,ChongqingMedicalUniversity,Chongqing,400016China)[Abstract]ObjectiveToinvestigatetheprotectiveeffectandpossiblemech
6、anismofhydrogensulfidepostconditioningonprimaryculturedcardiomyocytesofneonatalratsinjuredbyhypoxia-reoxygenation.MethodsSodiumhydrosulfidewasusedasanexogenousdonorofhydrogensulfide.Primaryculturedcardiomyocytesofneonatalratswererandomlydividedintofivegroups:(
7、1)controlgroup,(2)hypoxia-reoxygenationgroup,(3)dimethylsulfoxidegroup,(4)hydrogensulfidepostconditioninggroup,(5)LY294002+hydrogensulfidepostconditioninggroup(n=6).Cardiomyocytesviabilityandcreatinekinase,lactatedehydrogenaseinthemediumofculturedcardiomyocyte
8、sweremeasuredrespectivelyineachgroupatthepointofbeforehypoxia,hypoxiaandreoxygenation2h.ApoptosisofcardiomyocytesweredetectedbyflowcytometryandtheexpressionofHIF-1α,p-AktandAktprot