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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)容在工程資料-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)作用論文李華杰吳堅(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)
2、NG2和O4陽(yáng)性細(xì)胞逐漸減少,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】ObjectiveToexplorethechangeofoligodendrocyteprecursorcellsinadultratsafterfoca
3、lcerebralischemiaandtheprotectionofMK801andNBQXtothem.MethodsFocalcerebralischemiaandreperfusionmodelinmaleadultSDratsiddlearteryinutesandthenreperfusionfor1day,7daysand14days.OnemicroliterMK801(5mmol/L)andNBQX(50mmol/L)icareaofSDratsunderstereodirectionalinstrumentrigh
4、tafterischemia.ThenNG2,O4positivecellsintheischemiccore,ischemicpenumbraandcontralateralareaofratsinatedateachtimepointafterreperfusionbyimmunofluorescencehistochemistry.ResultsThenumberofNG2,O4positivecellsiccoredecreasedsignificantlyateachtimepointount.ThenumberofNG2
5、andO4positivecellsicpenumbraincreasedgraduallyafterreperfusionount.ConclusionThemarkedincreaseofoligodendrocyteprecursorcellsisobservedintheperiinfarctareaduringthepostischemicreperfusionperiodintheadultratbrain.AndNBQXhassomeneuroprotectiveeffecttooligodendrocyteprecur
6、sorcellsinpostischemicbraininjury.【Keyia;Reperfusion;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
7、氨基3羥基5甲基4異唑丙酸鹽(alphaamino3hydroxy5methyl4isoxazolepropionate.freelin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)期間使大鼠肛溫保持在37~37.5℃。大鼠清醒后具備以下表現(xiàn)者為動(dòng)物模型制作成功,記入實(shí)驗(yàn)組:大鼠朝左側(cè)轉(zhuǎn)圈爬行,或者左前肢無(wú)力并向左側(cè)方爬行3。NBQX組和MK801組大鼠腦缺血后即刻在KOPFTAXIC500900型立體定位儀下分別向其腦內(nèi)缺血區(qū)注射NBQX(50mmol/L)和MK801(5m
8、mol/L)各1μl,注射速度0.2μl/min5。生理鹽水組大鼠依照上述方式注射1μl生理鹽水。1.3組織標(biāo)本制備用3.6%水合氯醛腹腔注射將大鼠麻醉后,經(jīng)主動(dòng)脈先后灌注4℃的