摘要
目的研究黄酮类化合物漆黄素对Ap诱发小鼠学习功能障碍的影响。方法通过侧脑室植入的引导管灌注Ap(1-42)建立AD小鼠模型。Ap灌注7d前开始每天进行漆黄素干预并持续至实验结束。AB灌注3d后,利用经典的水迷宫观察小鼠学习记忆功能的变化,实验结束后立即分离海马组织,提取核蛋白和总蛋白,分别利用Western blotting和RT-PCR方法检测小鼠海马核内核因子E2相关因子2(Nrf2)蛋白水平及其下游靶基因血红素加氧酶(HO-1)和1-谷氨酰半胱氨酸连接酶(1-GCL)催化亚基(GCLC)和修饰亚基(GCLM)的mRNA表达水平。结果(1)水迷宫实验结果显示,漆黄素干预组[10mg/kg:(17.54±3.56)s;20mg/kg:(13.04±2.36)s]较A8(142)模型组[(25.40±3.33)s;(1.70±0.05)次]能够剂量依赖性明显降低潜伏期,并增加穿过平台所在位置的次数[10mg/kg:(2.50±0.40)次;20ms/kg:(3.50±0.36)次],差异具有统计学意义(P〈0.05或P〈0.01);(2)Western blotting和RT-PCR结果显示,漆黄素干预组较AB(1-42)模型组能够明显增加海马核内Nrf2蛋白表达水平(10mg/kg:0.11±0.01;20mg/kg:0.16±0.02),上调HO-1(10mg/kg:0.56±0.06;20mS/kg:0.79±0.10)、GCLC(10mg/kg:0.61±0.04;20mg/kg:0.86±0.09)和GCLM(10ms/kg:0.35±0.04;20ms/kg:0.51±0.04)mRNA水平,差异均具有统计学意义(P〈0.05或P〈0.01)。结论漆黄素可有效缓解Aβ(1-42)诱发的小鼠认知功能障碍,其促智作用很可能与激活内源Nrf2抗氧化中枢信号通路有关。
Objective To explore the effects of fisetin on the learning and memory abilities impairments induced by Aβ in mice. Methods Alzheimer disease (AD) animal model was made by single intracerebroventricular infusion of Aβ (1-42) through guide cannula. Fisetin was orally administered 7 days before Aβ infusion once a day, and continued throughout the experimental period. Water maze test began on day 3 after Aβ infusion. All mice were sacrificed and hippocampi were dissected immediately after behavioral test. The protein expression of hippocampal nuclear Nrf2 and the mRNA level of HO-1, GCLC and GCLM were examined by western blotting and RT-RCR techniques respectively. Results ( 1 ) Aβ (1-42) significantly increased escape latency in hidden platform test ( ( 25.4 ± 3.33 ) s), and decreased the number of crossings in probe test ( 1.70 ± 0.25 ) compared with control ( ( 9.05 ± 1.37 ) s) for hidden plat form ;4.50 ± 0. 41 for probe test) and Aβ ( 42-1 ) -treated group ( ( 10.80 ± 1.38 ) s ) for hidden platform test ; 4.10 ± 0.39 for probe test ; P 〈 0.01 ). The prolonged treatment with fisetin dose-dependently reversed the changes (10 mg/kg: 17.54 ± 3.56s for hidden platform test ;2.50 ± 0.40 for probe test, P 〈 0.05,20 mg/kg: ( 13.04 ± 2.36) s for hidden platform test; 3.60 ± 0.36 for probe test, P 〈 0.01 ). (2) Aβ (1-42) significantly decreased the nuclear Nrf2 protein level (0.07 ±0.02) ,and mRNA level (0.45 ±0.04) of HO-1, GCLC (0.41 ± 0.04) and GCLM (0.26 ± 0.03 ) in the hippoeampus of mice compared with con- trol (0.18 ± 0.02 for Nrf2 ;0.83± 0.09 for HO-1 ; 1.01 ± 0.10 for GCLC ; 0.65 ± 0.07 for GCLM) and Aβ (42- 1 ) -treated group (0.21 ±0.02 for Nrf2 ; 0. 90 ± 0.08 for HO-1 ; 1.11 ± 0.11 for GCLC ; 0.72± 0.07 for GCLM) ( P 〈 0.05 or P 〈 0.01 ). However, fisetin administration significantly counteracted these changes ( 10 mg/kg :0.11 ± 0. 01 for Nrf2 ; 0. 56 ± 0. 06 fo
出处
《中华行为医学与脑科学杂志》
CAS
CSCD
北大核心
2012年第10期865-868,共4页
Chinese Journal of Behavioral Medicine and Brain Science
基金
国家自然科学基金面上项目(30670714)
无锡市科技局政产学研项目(CYE01012)