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《nbqx對(duì)腦缺血再灌注后成年大鼠大腦少突膠質(zhì)前體細(xì)胞的保護(hù)作用》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、NBQX對(duì)腦缺血再灌注后成年大鼠大腦少突膠質(zhì)前體細(xì)胞的保護(hù)作用:李華杰吳堅(jiān)盛世英朱林鳳張菊美【摘要】目的探討腦缺血再灌注后成年大鼠大腦少突膠質(zhì)前體細(xì)胞的變化及MK801和NBQX對(duì)其保護(hù)作用。方法以線栓法制作成年SD大鼠局灶性腦缺血再灌注模型(阻塞90min再灌注1d、7d和14d),分別向其大腦皮質(zhì)缺血區(qū)立體定向注射5mmol/L的MK801和50mmol/L的NBQX各1μl,用免疫熒光組織化學(xué)法檢測(cè)腦缺血再灌注后成年大鼠早期大腦梗死中心區(qū)、梗死周邊區(qū)和缺血對(duì)側(cè)NG2和O4陽(yáng)性細(xì)胞數(shù)量。結(jié)果腦缺血再灌注后成年大鼠大腦皮質(zhì)梗死中心區(qū)NG2和O4陽(yáng)性細(xì)胞逐
2、漸減少,NBQX組大鼠NG2和O4陽(yáng)性細(xì)胞數(shù)減少的幅度較少。腦缺血再灌注后梗死周邊區(qū)NG2和O4陽(yáng)性細(xì)胞數(shù)逐漸增加,NBQX組大鼠增加更明顯,而MK801組與生理鹽水組無(wú)明顯差別。結(jié)論成年SD大鼠腦缺血再灌注后梗死周邊區(qū)少突膠質(zhì)前體細(xì)胞增多。NBQX對(duì)少突膠質(zhì)前體細(xì)胞早期的缺血性損傷有保護(hù)作用?!娟P(guān)鍵詞】缺血;再灌注;少突膠質(zhì)前體細(xì)胞;NBQX 【Abstract】ObjectiveToexplorethechangeofoligodendrocyteprecursorcellsinadultratsafterfocalcerebralischemiaan
3、dtheprotectionofMK801andNBQXtothem.MethodsFocalcerebralischemiaandreperfusionmodelinmaleadultSDratsiddlearteryinutesandthenreperfusionfor1day,7daysand14days.OnemicroliterMK801(5mmol/L)andNBQX(50mmol/L)icareaofSDratsunderstereodirectionalinstrumentrightafterischemia.ThenNG2,O4pos
4、itivecellsintheischemiccore,ischemicpenumbraandcontralateralareaofratsinatedateachtimepointafterreperfusionbyimmunofluorescencehistochemistry.ResultsThenumberofNG2,O4positivecellsiccoredecreasedsignificantlyateachtimepointount.ThenumberofNG2andO4positivecellsicpenumbraincreasedg
5、raduallyafterreperfusionount.ConclusionThemarkedincreaseofoligodendrocyteprecursorcellsisobservedintheperiinfarctareaduringthepostischemicreperfusionperiodintheadultratbrain.AndNBQXhassomeneuroprotectiveeffecttooligodendrocyteprecursorcellsinpostischemicbraininjury. 【Keyia;Reper
6、fusion;Oligodendrocyteprecursorcells;NBQX 興奮性氨基酸毒性損傷作用是腦創(chuàng)傷和腦卒中等中樞神經(jīng)系統(tǒng)(centralnervoussystem,S)疾病中神經(jīng)元死亡的主要因素之一[1]。而少突膠質(zhì)前體細(xì)胞(oligodendrocyteprecursorcells,OPC)膜上含有大量的興奮性氨基酸受體[2]。MK801和NBQX分別是N甲基D天冬氨酸(NmethylDaspartate,NMDA)受體和α氨基3羥基5甲基4異唑丙酸鹽(alphaamino3hydroxy5methy
7、l4isoxazolepropionate,AMPA)受體的拮抗劑。我們觀察了腦定向注射MK801和NBQX對(duì)大鼠腦缺血再灌注后早期大腦皮質(zhì)NG2和O4表達(dá)的影響,報(bào)道如下?! ?材料和方法 1.1動(dòng)物和分組成熟雄性SD大鼠(蘇州大學(xué)實(shí)驗(yàn)動(dòng)物中心提供)280~320g,共60只,隨機(jī)分為正常對(duì)照組(缺血前)、生理鹽水組、MK801組和NBQX組,缺血再灌注后1d、7d及14d共10個(gè)小組,每組6只大鼠。 1.2動(dòng)物模型制作大鼠腦缺血再灌注損傷模型制作參照Kitagain后拔除尼龍線,開(kāi)始再灌注。對(duì)照組麻醉后分離出右側(cè)頸總動(dòng)脈,然后縫合。麻醉及手術(shù)期
8、間使大鼠肛溫保持在37~37.5℃?!?/p>