番茄红素对寰枢椎失稳老龄小鼠记忆的影响

目的 观察番茄红素（Lycopene）对寰枢椎失稳老龄小鼠记忆的影响.方法 10月龄ICR雌性小鼠40只,雌雄各半,完全随机分为5组：正常对照组、模型组、维生素E组、番茄红素高5 mg/kg、低（25 mg/kg）剂量组,每组8只.利用水迷宫、跳台实验测试小鼠记忆能力 碱羟胺比色法测定脑组织乙酰胆碱含量,试剂盒检测脑组织胆碱酯酶（AchE）活性 苏木素-伊红（HE）染色法观察小鼠脑海马CA1区神经元细胞形态变化.结果 水迷宫实验中模型组游全程时间（116.7±8.7）s,错误次数（16.0±2.8）次,番茄红素高剂量组小鼠游全程时间缩短为（107.9±21.8）s、错误次数（6.6±3.9）次显著减少（P＜0.01） 跳台实验,番茄红素高剂量组的反应期（68.3±22.7）s,与模型组（123.4±68.6）s相比明显缩短（P＜0.01）,其高、低剂量组的错误次数均明显减少（P＜0.01） 番茄红索高剂量组AchE活性（8.6±1.8）U/mg与模型组（17.7±2.6）U/mg相比显著降低（P＜0.01）,而番茄红素低剂量组间差异无统计学意义,番茄红素高、低剂量组乙酰胆碱含量显著升高（P＜0.01） HE染色可见番茄红素高剂量组小鼠海马CA1区锥体细胞形态基本规则,只见少数散在核固缩细胞.结论 番茄红素对寰枢椎长期乳酸堆积的老龄小鼠记忆能力具有一定的改善作用.

Effect of lycopene on memory in atlanto-axial joint cumulating senile mice

Objective To observe the effect of Lycopene on the improvement of memory abilities by cumulating lactic acid for long time in atlas dentata vertebrae senile mice. Methods Totally 30% lactic acid 30μL one time every week was injected into the place between the first and the second cervical vertebrae for 3 weeks. Forty mice were randomized into five groups:young control group, model group, VitE group(50 mg/kg), control group,and two therapeutic groups of lycopene which was intragastric at the doses of 5, 2.5 mg/kg once everyday. The changes of memory in mice were observed with water-maze test and step-down avoidance test. The activities of acetylcholine esterase(AchE), and the content of acetylcholine, (Ach) in encephalon were tested. HE staining in mice brain, including the cortex and hippocampus was demonstrated. Results Compared with model group. Lycopene high dose could significantly shortened the latency period and wrong times in water-maze test (P ＜0.01 ), In stepdown avoidance test, the reaction period was shortened significantly ( P ＜ 0.01 ) and the latency period was shortened significantly. The activities of ChE decreased (P ＜0.01 ) and the content of ACh increased in the Lycopene high doses group(P＜0.01 ). The therapeutic groups of lycopene had less pathological change of cellular necrosis,neuron loss in hippocampal CAI than the model group. Conclusion Lycopene has a certain protective and improving effect on the decline of memory ability and cervical lesion induced by lactic acid in atlanto-axial joint cumulating.