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1、摘要目的:研究腹腔注射谷氨酰胺對大鼠視網(wǎng)膜興奮性損傷中Bm3a表達的影響。方法:健康清潔型Wistar大鼠55只隨機分為三組,正常對照組5只,實驗對照組25只、實驗組25只。正常對照組不做任何處理,實驗對照組和實驗組中所有大鼠玻璃體腔注射2gl80mmol/1NMDA制作視網(wǎng)膜興奮性損傷模型,實驗組在大鼠視網(wǎng)膜興奮性損傷模型制作7h后腹腔注射谷氨酰胺(0.75g/kg)。實驗組及實驗對照組分別在造模后8h、12h、16h、24h、48h各隨機處死5只大鼠,正常對照組大鼠在不同時間點隨機處死一只。HE染色光鏡下觀察各組視網(wǎng)膜組織的形態(tài)學(xué)變化,免疫組織化學(xué)染色及實時熒光定量RT-PCR方法檢測視網(wǎng)
2、膜Bm3a表達的變化。結(jié)果:HE染色顯示正常對照組大鼠視網(wǎng)膜組織結(jié)構(gòu)層次清楚,染色均勻,細(xì)胞形態(tài)規(guī)則。實驗各組大鼠視網(wǎng)膜神經(jīng)節(jié)細(xì)胞排列紊亂,胞漿內(nèi)空泡樣變性,視網(wǎng)膜組織變薄,隨時間延長神經(jīng)節(jié)細(xì)胞數(shù)目逐漸減少。實時熒光定量RT-PCR結(jié)果顯示實驗各組Bm3amRNA均較正常組減少;造模后12h、16h、24h、48h,實驗組Bm3amRNA均高于實驗對照組,差異均有統(tǒng)計學(xué)意義;造模后8h,實驗組與實驗對照組Bm3amRNA差異無統(tǒng)計學(xué)意義。免疫組織化學(xué)染色結(jié)果顯示Bm3a只在視網(wǎng)膜神經(jīng)節(jié)細(xì)胞層表達,陽性細(xì)胞計數(shù)及光密度值測定結(jié)果與實時熒光定量PCR結(jié)果相吻合。結(jié)論:1.成功建立大鼠視網(wǎng)膜興奮性損
3、傷模型;2.NMDA可致大鼠視網(wǎng)膜中Bm3a及其mRNA表達減少;3.腹腔注射谷氨酰胺可增加大鼠興奮性損傷視網(wǎng)膜中Bm3a的表達,提高神經(jīng)節(jié)細(xì)胞的存活率。碩士研究生:紀(jì)珍(眼科學(xué))指導(dǎo)老師:王大博教授關(guān)鍵詞:谷氨酰胺;視網(wǎng)膜;N一甲基天冬氨酸;Brn3aGlutamineProtectsRetinaFollowingExcitotocityInjuryinRatAbstractObjeetiveToobservetheeffectofglutamineonBm3aexpressioninretinaafterNMDA烈一methyl—D-aspartate)excitotocityinjury
4、inrat.MethodsFifty-fiveadultcleanWistarratswererandomlydividedintothreegroups:normalcontrolgroupincludingfiverats,experimentalcontrolgroupincludingtwenty—fiveratsthatweretreatedwithNMDA(2p1,80mmol/1)byintravitrealinjection,experimentalcontrolincludingtwenty-fiveratswhichweretreatedwithglutamine(0.75
5、9/kg)byintraperitonealinjectionsevenhoursafterNMDAinjected.Randomlychoosedfiveratsofexperimentalcontrolgroupandexperimentalgroupweresacrificedat8,12,16,24,48hourafterNMDAinjectedrespectively.Therats’retinawasHEstainedandobservedunderlightmicroscope.TheexpressionlevelofBrn3aweredeterminedbyimmunohist
6、ochemistryandReal—Timefluorescencequantitativereversetranscriptionpolymerasechainreaction(Real—TimeRT-PCR).ResultsHEstainingshowedthatthestructureofretinaofnormalcontrolgroupwashistologicallywell-defined,uniforminstaining,andwithregularcellshape.Inexperimentalgroup,theretinalganglioncells(RGCs)werel
7、ooselyarrangedanditsnumberdecreasedwithtime.a(chǎn)ndtheretinabecamethinner.Real-TimeRT-PCRresultsshowedthatBrn3amRNAexpressiondecreasedinallexperimentaleyescomparedwithnormalcontroleyes(allP<0.05).Therewas