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反式白藜芦醇对痴呆大鼠的保护作用
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摘要
目的观察反式白藜芦醇(TR)对Aβ25-35损伤大鼠海马的保护作用。方法大鼠经Morris水迷宫训练后,随机分为5组:(1)假手术组;(2)模型组;(3)—(5)分别为TR高、中、低剂量组。在大鼠双侧海马内注射Aβ25-35,制模后用TR干预,以旨在观察TR对Aβ25-35所致的神经毒性的影响。利用水迷宫检测各组大鼠的空间辨别和学习记忆能力;采用TUNEL法检测5组大鼠海马细胞凋亡情况;采用real-time RT-PCR法检测5组大鼠海马及皮质caspase-8,9、诱导型一氧化氮合酶(iNOS) mRNA表达。结果大鼠海马内注射Aβ25-35制模后在水迷宫中的逃避潜伏期和寻台搜索距离明显延长,海马caspase-8,9 mRNA、iNOS表达增加,大鼠海马组织凋亡细胞增加。而TR干预组表达减少,凋亡细胞也减少。第(1)组到第(5)组中PCR法检测caspase-8mRNA的表达量分别为0.27±0.09、1.34±0.87、0.24±0.09、0.29±0.06、0.64±0.15;各组caspase-9mRNA的表达量分别为0.34±0.07、0.98±0.17、0.32±0.13、0.44±0.18、0.91±0.25;各组iNOS mRNA表达分别为0.23±0.90、1.23±0.91、0.34±O.18、0.48±O.12、0.87±0.49。所有干预组与对照组相比(P<0.01)均有差异。TUNEL法检测各组大鼠海马标本,在荧光显微镜下海马细胞的凋亡指数分别为6±3、24±3、7±2、11±4、20±3(%),干预组与对照组相比(P<0.01)有差异。TUNEL法检测(1)到(5)组的凋亡指数(术后第11天)分别为:3.23±0.52、21.32±5.02、5.72±1.56、7.21±1.22、10.93±3.25(%);(术后第11天)分别为3.21±0.29、16.31±4.27、5.13±2、7.12±1.78、9.84±2.66(%),同组凋亡指数相比没有差异(P>0.05)。结论TR可减轻Aβ25-35诱导的大鼠记忆减退,其机制可能部分与下调大鼠海马caspase-8,9、iNOSmRNA表达从而减少海马细胞凋亡有关。
Objective:To investigate the protective effects of the efficient ingredient of Polygonum cuspidatum trans-resveratrol (TR) on AD rats. Methods After being trained using Morris water maze, rats were randomly divided into 5 groups:(1) sham-operated-group; (2) model-group(3)-(5) were TR high, middle and low dose group, injecting Aβ25-35 to bilateral hippocampus in vivo modeling method. These three groups were treated with TR after the model was established. TR had been intervening in molding rats aim to observe the toxic effect of Aβ25-35.Morris water maze was used to test the ability of spatial learning and memory of rats in 5 groups; TUNEL assay was used to test apoptosis rate of hippocampus and the cortex around cells; Using real-time RT-PCR to detect the mRNA expression of caspase-8,9, inducible nitric oxide synthase (iNOS) in hippocampus and cortex. Results Molding rats by injecting AP25-35 to hippocampus decreased the abilities of spatial memory and increased the mRNA expressions of caspase-8,9 and iNOS mRNA in hippocampus. However, TR intervention group decreased expressions of caspase-8 and iNOS in hippocampus, apoptotic cells decreased also. The mRNA expression of caspase-8 from group (1) to group (5) were 0.27±0.09,1.34±0.87,0.24±0.09,0.29±0.06,0.64±0.15 respectively; The mRNA expression of caspase-9 from group (1) to group (5) were 0.34±0.07,0.98±0.17、0.32±0.13、0.44±0.18、0.91±0.25 respectively; The mRNA expression of iNOS in each group were 0.23±0.90,1.23±0.91,0.34±0.18,0.48±0.12,0.87±0.49 respectively, All intervention group compared with the control group were different (P<0.01). the hippocampus cells apoptotic index(AI) using TUNEL assay in each group were 6±3, 24±3,7±2,11±4,20±3(%) respectively under fluorescence microscope; AI in each group 11day after modeling were 3.23±0.52,21.32±5.02,5.72±1.56,7.21±1.22, 10.93±3.25(%) respectively; intervention group compared with the control group is different (P<0.01). and 17 day after modeling AI were 3.21±0.29,16.31±4.27,5.13±2, 7.12±1.78,9.84±2.66(%) respectively; Same group AI between the 11 day and 17 day is not different (P>0.01). Conclusion Treatment with different dose of TR can reduce Aβ25-35-induced memory impairment in rats. The mechanism may be partly associated with down regulating the mRNA expression of caspase-8 and iNOS in rat hippocampus, and reducing the cell apoptosis in hippocampus.
引文
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