李超++毕鹏翔++董妍++雷佳宇++袁晓环++郭艳芹
[摘要] 目的 研究姜黄素类似物H8对Aβ25-35(β-amyloid protein 25-35)诱导的PC12细胞凋亡相关基因Caspase-3、Bcl-2、Bax表达的影响。 方法 CCK-8法检测Aβ25-35及姜黄素类似物H8的细胞毒性,以Aβ25-35诱导PC12细胞(大鼠肾上腺嗜铬细胞瘤细胞)建立AD细胞模型,并使用不同浓度的H8进行干预,通过RT-qPCR法检测各组凋亡相关基因Caspase-3、Bcl-2、Bax mRNA表达。 结果 H8在实验浓度范围内几乎无细胞毒性,Aβ25-35具有明显的细胞毒性并呈浓度依赖性,经过H8干预后细胞存活率明显升高,其中以20 μmol/L的H8作用最明显(P<0.001)。经过H8作用后能降低Aβ25-35诱导的Caspase-3、Bax mRNA表达,升高Bcl-2 mRNA表达。 结论 姜黄素类似物H8能够抑制Aβ25-35诱导的凋亡相关基因,发挥抗凋亡作用。
[关键词] 姜黄素类似物;细胞凋亡;Caspase-3;Bcl-2;Bax
[中图分类号] R285.5 [文献标识码] A [文章编号] 1673-9701(2017)10-0001-04
Effects of curcumin analogues on cell apoptosis induced by Aβ25-35 in AD cell model
LI Chao BI Pengxiang DONG Yan LEI Jiayu YUAN Xiaohuan GUO Yanqin
Mudanjiang Medical College, Mudanjiang 157011, China
[Abstract] Objective To investigate the effect of curcumin analogue H8 on the expressionof apoptosis-related genes Caspase-3, Bcl-2 and Bax in PC12 cells induced by Aβ25-35(β-amyloid protein 25-35). Methods The cytotoxicity of Aβ25-35 and curcumin analogue H8 were detected by CCK-8. The AD cell model was established using PC12 cells (rat adrenal pheochromocytoma cells) induced by Aβ25-35 and the cells were treated with different concentrations of H8. The expression of Caspase-3, Bcl-2 and Bax mRNA were detected by RT-qPCR. Results H8 had almost no cytotoxicity in the experimental concentration range, while Aβ25-35 had obvious cytotoxicity and concentration-dependent. The cell survival rate was significantly increased after H8 intervention, among them, 20 μmol/L H8 was most significantly(P<0.001). After treatment with H8 could reduce Aβ25-35-induced Caspase-3, Bax mRNA expression and increase Bcl-2 mRNA expression. Conclusion Curcumin analogues H8 can inhibit Aβ25-35-induced apoptosis-related genes, with anti-apoptotic effect.
[Key words] Curcumin analogues;Cell apoptosis;Caspase-3;Bcl-2;Bax
阿尔茨海默病(Alzheimer's disease,AD)是一种进行性发展的神经系统退行性疾病,表现为认知功能不断恶化,日常生活能力进行性减退和丧失[1]。AD的发病机制十分复杂,研究表明,神经细胞凋亡在AD发生发展中具有重要作用[2]。姜黄素(curcumin)是一种低分子量酚类化合物,提取于姜黄、郁金等姜黄属植物的根茎中,药理作用广泛,具有抗炎、抗氧化、免疫调节、抗肿瘤、神经保护等多方面的药理作用[3,4]。近年来研究发现姜黄素能够抑制Aβ诱导的神经细胞凋亡。然而,姜黄素在体内的生物活性低、代谢快、吸收少、生物利用率低,极大地限制了其应用[5]。本实验以姜黄素为母体去掉其β-二酮基团,设计了稳定的、分子量更小的戊-1,4二烯-3-酮类似物(H8)。本研究利用Aβ25-35诱导大鼠肾上腺嗜铬细胞瘤细胞(PC12细胞)建立AD细胞模型,观察姜黄素及其类似物对Aβ25-35诱导PC12细胞凋亡的影响并观察其中凋亡相关基因及蛋白Bax、Bcl-2、Caspase-3表达的变化,阐明姜黄素类似物H8治疗AD的可能机制,为研究和治疗阿尔茨海默病提供实验依据。……