楊宇 賈真 何來鵬 劉廣雁
【摘要】 目的:探討丁苯酞對β-淀粉樣蛋白(β-amyloid protein,Aβ)誘導新生SD大鼠海馬神經元凋亡的保護作用。方法:將培養的大鼠海馬神經元細胞分成Aβ組、Aβ+丁苯酞組和對照組三組,其中Aβ組采用20 μmol/L Aβ處理24 h;Aβ+丁苯酞組先采用10 μmol/L丁苯酞處理30 min后再加入20 μmol/L Aβ處理24 h;對照組不進行任何處理。檢測各組海馬神經元凋亡、誘導型一氧化氮合酶(inducible nitric oxide synthase,iNOS)表達情況。結果:(1)MTT檢測結果:Aβ組和Aβ+丁苯酞組OD570均顯著低于對照組(P<0.05),Aβ+丁苯酞組OD570顯著高于Aβ組(P<0.05)。Aβ組和Aβ+丁苯酞組相對于對照組的海馬相神經元對存活率分別為48.15%、69.13%。(2)海馬神經元細胞凋亡情況:Aβ組和Aβ+丁苯酞組海馬神經元細胞凋亡率分別為(50.38±5.32)%和(25.87±2.66)%,均顯著高于對照組的(1.24±0.17)%,而Aβ組海馬神經元細胞凋亡率顯著高于Aβ+丁苯酞組(P<0.05)。(3)Western Blotting結果:Aβ組、Aβ+丁苯酞組和對照組iNOS相對表達量分別為(1.92±0.18)、(0.98±0.12)和(0.37±0.08),Aβ組和Aβ+丁苯酞組iNOS相對表達量均顯著高于對照組,Aβ組iNOS相對表達量顯著高于Aβ+丁苯酞組(P<0.05)。結論:丁苯酞能夠有效抑制Aβ造成的大鼠海馬神經元細胞的凋亡作用,降低iNOS表達水平,減少自由基產生和毒性作用。
【關鍵詞】 丁苯酞; β淀粉樣蛋白; 海馬神經元; 凋亡
Effects of Butylphthalide onβ-amyloid Protein Induced Apoptosis in Hippocampal Neurons of Neonatal SD Rats/YANG Yu,JIA Zhen,HE Lai-peng,et al.//Medical Innovation of China,2017,14(17):034-037
【Abstract】 Objective:To investigate the protective effect of Butylphthalide onβ-amyloid protein(Aβ) induced apoptosis in hippocampal neurons of neonatal SD rats.Method:Cultured rat hippocampal neuron cells were divided into Aβ group,Aβ+Butylphthalide group and the control group,Aβ group with 20 μmol/L Aβ 24 h,Aβ+Butyphthalide group with 10 μmol/L Butylphthalide treatment 30 min after adding 20 μmol/L Aβ
24 h,the control group without any treatment.The apoptosis of hippocampal neurons and the expression of inducible nitric oxide synthase(iNOS) in three groups were detected.Result:(1) The results of MTT test:OD570 of Aβ group and Aβ+Butyphthalide group were significantly lower than that of the control group(P<0.05),OD570 of Aβ+Butyphthalide group were significantly higher than that of Aβ group (P<0.05).Compared with the control group,the survival rate of hippocampal neurons in Aβgroup and Aβ+Butyphthalide group were 48.15% and 69.13%.(2)Hippocampal neurons apoptosis:cell apoptosis rate of hippocampal neurons of Aβ group and Aβ+Butyphthalide group were (50.38±5.32)% and (25.87±2.66)%,significantly higher than (1.24±0.17)% of the control group,Aβ group was significantly higher than that of Aβ+Butyphthalide group(P<0.05).(3)Western Blotting results:iNOS relative expression of Aβ group,Aβ+Butyphthalide group and the control group were (1.92±0.18),(0.98±0.12) and (0.37±0.08), Aβ group and Aβ+Butyphthalide group were significantly higher than that of the control group,Aβ group was significantly higher than that of Aβ+Butyphthalide group(P<0.05).Conclusion:Butylphthalide can effectively inhibit apoptosis of cells in rat hippocampal neurons caused by Aβ,decrease the expression level of iNOS,reduce the production of free radicals and toxicity.
【Key words】 Butyphthalide; Amyloid beta protein; Hippocampus; Apoptosis
First-authors address:Department of Geriatrics of Guangdong Medical University,Zhanjiang 524000,China
doi:10.3969/j.issn.1674-4985.2017.17.009
阿爾茨海默癥(Alzheimer disease,AD)是老年癡呆最常見的種類,約占老年癡呆的59%[1]。AD是一種以進行性認知功能減退和日常生活能力下降為臨床表現的神經變性疾病,神經元丟失、神經元纖維纏結和神經元外老年斑等是AD最主要的病理特點[2-3]。老年斑的形成是由于β-淀粉樣蛋白(β-amyloid protein,Aβ)在神經元細胞外異常沉積有關,Aβ沉積能夠直接造成神經元細胞死亡,并激活膠質細胞進而釋放炎癥因子,加劇神經變性作用[4-5]?;诖?,目前治療AD的重要手段即是采用藥物減少Aβ的產生,并促進已經沉積的Aβ發生降解,主要藥物藥品包括布洛芬、吲哚美辛、17-β雌二醇等[6]。丁苯酞(dl-3-n-butylphthalide)是目前常用的急性缺血性卒中的治療藥物,該藥能夠改善神經元細胞線粒體功能,消除氧自由基,提高細胞內抗氧化酶活性,降低谷氨酸釋放,抑制血小板聚集反應,從而實現改善神經功能減退狀況[7]。已有研究證實,丁苯酞能夠改善AD模型動物認知和記憶功能的作用[8]。本研究旨在深入探討丁苯酞在Aβ誘導新生SD大鼠神經元凋亡的保護機制,現報道如下?!?br>