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《依達(dá)拉奉對幼鼠驚厥持續(xù)狀態(tài)后海馬xbp1 mrna和caspase12表達(dá)及神經(jīng)元凋亡的影響論文》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、依達(dá)拉奉對幼鼠驚厥持續(xù)狀態(tài)后海馬XBP1mRNA和caspase12表達(dá)及神經(jīng)元凋亡的影響論文鄧小龍,王海萍,焦穎,林忠東,李光乾【摘要】目的:探討依達(dá)拉奉對幼鼠驚厥持續(xù)狀態(tài)(statusconvulsion,SC)后海馬內(nèi)質(zhì)網(wǎng)應(yīng)激(endoplasmicreticulumstress,ERS)關(guān)鍵標(biāo)志分子X盒結(jié)合蛋白1(X-boxbindingprotein1,XBP1)mRNA、caspase-12的表達(dá)及神經(jīng)元凋亡的影響。方法:將19~21日齡SD大鼠隨機(jī)分入驚厥持續(xù)狀態(tài)(SC)組、依達(dá)拉奉(ED)組、生理鹽水對照(NS)組;各組再按不同時(shí)間點(diǎn)分五個(gè)
2、亞組。應(yīng)用氯化鋰-匹魯卡品建立大鼠SC模型.freelRNA的表達(dá)情況。用免疫組織化學(xué)方法觀察海馬caspase-12蛋白表達(dá)情況。用TUNEL法觀察神經(jīng)元凋亡細(xì)胞數(shù)。結(jié)果:幼年大鼠海馬中XBP1和caspase-12在SC組表達(dá)顯著增強(qiáng),與NS組比較差異有顯著性(P0.01);與SC組比較,ED組XBP1mRNA表達(dá)顯著升高(P0.01或P0.05),caspase-12mRNA及蛋白表達(dá)顯著降低(P0.01或P0.05);SC組在驚厥12h后的各時(shí)間點(diǎn)海馬CA1區(qū)TUNEL陽性細(xì)胞數(shù)均顯著高于NS組(P0.01),而ED組TUNEL陽性細(xì)胞數(shù)均較SC組
3、顯著下降(P0.01或P0.05)。結(jié)論:依達(dá)拉奉有可能通過上調(diào)XBP1的表達(dá)與下調(diào)caspase-12的表達(dá),并使神經(jīng)元凋亡數(shù)目減少,從而發(fā)揮對神經(jīng)元的保護(hù)作用?!娟P(guān)鍵詞】依達(dá)拉奉;驚厥持續(xù)狀態(tài);XBP1;caspase-12;神經(jīng)元;凋亡Abstract:Objective:ToinvestigatetheexpressionofthekeymarkerofERSX-boxbindingprotein1(XBP1)mRNA,Caspase-12andneuronapoptosisintherathippocampusafterstatusconvuls
4、ion(SC),andtheeffectstolyenrolledintotheNScontrolgroup(NS,n=40),statusconvulsiongroup(SC,n=40)andEdaravonegroup(ED,n=40).Eachgroupepoints.TheSCanimalmodel-pilocarpine.TheexpressionlevelsofXBP1andcaspase-12mRNAinthehippocampusicallydetetcedbysemiquantitativereversetranscriptionpoly
5、merasechainreaction(RT-PCR).Caspase-12proteinmunohistochemistrymethod.TheneuronapoptosisediateddUTPnickendlabeling(TUNEL).Results:TheexpressionofXBP1andcaspase-12increasedmarkedlyinSCgroup.ThedifferenceRNAinEDgroupRNAandproteinsignificantlydecreased(P0.01,orP0.05)paredtotheSCgroup
6、.TheTUNELpositivecellsinhippocampusCA1ofSCgrouporethanthatofNSgroup12haftertheSC(P0.01).Aftertheinterventionofedaravone,TUNELpositivecellsshoayserveasaneffectiveagentforcuringthebraindamageafterSCinvivo;themechanismofprotectingtheneuronmayincludeupregulatingtheexpressionofXBP1,dob
7、erofapoptoticneurons.Keyicreticulum,ER)作為細(xì)胞內(nèi)蛋白質(zhì)合成、修飾、轉(zhuǎn)運(yùn)以及細(xì)胞內(nèi)Ca2+濃度穩(wěn)態(tài)調(diào)節(jié)器官,對內(nèi)環(huán)境的改變比較敏感。缺血低氧、氧化應(yīng)激等均可導(dǎo)致ER腔Ca2+穩(wěn)態(tài)的改變以及大量未折疊和錯(cuò)折疊蛋白的堆積,從而引起內(nèi)質(zhì)網(wǎng)應(yīng)激(endoplasmicreticulumstress,ERS)1-3。已有研究發(fā)現(xiàn),驚厥持續(xù)狀態(tài)(statusconvulsion,SC)后,大鼠海馬中ERS凋亡相關(guān)因子Caspase-12表達(dá)上調(diào)4-5。而X盒結(jié)合蛋白1(X-boxbindingprotein1,XBP1)作為ERS
8、細(xì)胞保護(hù)信號(hào)途徑中的關(guān)鍵分子,SC后表達(dá)情況及其與caspase-