目的:通过鱼藤酮持续灌胃构建的帕金森病小鼠模型研究α-突触核蛋白寡聚体(α-Syn)的毒性作用机制。方法:48只老年雄性C57小鼠随机分为鱼藤酮组和对照组,每组24只,鱼藤酮组灌注0.01 mL/g鱼藤酮氯仿溶液,对照组灌注0.01 m L/g氯仿溶液,...目的:通过鱼藤酮持续灌胃构建的帕金森病小鼠模型研究α-突触核蛋白寡聚体(α-Syn)的毒性作用机制。方法:48只老年雄性C57小鼠随机分为鱼藤酮组和对照组,每组24只,鱼藤酮组灌注0.01 mL/g鱼藤酮氯仿溶液,对照组灌注0.01 m L/g氯仿溶液,均连续灌胃12周。于灌胃后取脑,行蛋白质印迹实验检测α-Syn表达水平、透射电镜观察中脑黑质神经元超微结构;于灌胃前、后取脑,免疫组化染色观察黑质部位酪氨酸羟化酶(TH)阳性细胞密度,并检测脑组织中超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-PX)和丙二醛(MDA)水平。结果:灌胃12周后,Western blot显示鱼藤酮组中脑α-Syn的表达较对照组明显增多(P<0.05)。免疫组化染色显示鱼藤酮组中TH阳性细胞数量较对照组明显减少(P<0.05)。透射电镜显示鱼藤酮组小鼠黑质部可见线粒体、高尔基体不规则肿胀。鱼藤酮组SOD、GSH-PX水平较对照组明显下降(P<0.05),MDA水平较对照组显著增多(P<0.05)。结论:鱼藤酮小剂量持续灌胃可在脑内诱发形成α-Syn寡聚体,α-Syn寡聚体可能经氧化应激途径导致多巴胺神经元损伤。展开更多
Structural stability in terms of the decomposition temperature in LiMn_(2)O_(4) was systematically investigated by a series of high-temperature and high-pressure experiments.LiMn_(2)O_(4) was found to have structural ...Structural stability in terms of the decomposition temperature in LiMn_(2)O_(4) was systematically investigated by a series of high-temperature and high-pressure experiments.LiMn_(2)O_(4) was found to have structural stability up to 5 GPa at room temperature.Under ambient pressure,the compound decomposed at 1300℃.The decomposition temperature decreased with increasing pressure,yielding more complex decomposed products.Below the decomposition temperature,the crystal structure of LiMn_(2)O_(4) varied with pressure.The presented results in this study offer new insights into the thermal and pressure stability of LiMn_(2)O_(4) materials as a cathode for lithium-ion batteries that can operate under extreme conditions.Therefore,these findings may serve as a useful guide for future work for improving lithium-ion batteries.展开更多
文摘目的:通过鱼藤酮持续灌胃构建的帕金森病小鼠模型研究α-突触核蛋白寡聚体(α-Syn)的毒性作用机制。方法:48只老年雄性C57小鼠随机分为鱼藤酮组和对照组,每组24只,鱼藤酮组灌注0.01 mL/g鱼藤酮氯仿溶液,对照组灌注0.01 m L/g氯仿溶液,均连续灌胃12周。于灌胃后取脑,行蛋白质印迹实验检测α-Syn表达水平、透射电镜观察中脑黑质神经元超微结构;于灌胃前、后取脑,免疫组化染色观察黑质部位酪氨酸羟化酶(TH)阳性细胞密度,并检测脑组织中超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-PX)和丙二醛(MDA)水平。结果:灌胃12周后,Western blot显示鱼藤酮组中脑α-Syn的表达较对照组明显增多(P<0.05)。免疫组化染色显示鱼藤酮组中TH阳性细胞数量较对照组明显减少(P<0.05)。透射电镜显示鱼藤酮组小鼠黑质部可见线粒体、高尔基体不规则肿胀。鱼藤酮组SOD、GSH-PX水平较对照组明显下降(P<0.05),MDA水平较对照组显著增多(P<0.05)。结论:鱼藤酮小剂量持续灌胃可在脑内诱发形成α-Syn寡聚体,α-Syn寡聚体可能经氧化应激途径导致多巴胺神经元损伤。
基金by the National Natural Science Foundation of China(Grant No.12074273)the Doctoral Research Fund of Southwest University of Science and Technology(Grant No.20zx7136).
文摘Structural stability in terms of the decomposition temperature in LiMn_(2)O_(4) was systematically investigated by a series of high-temperature and high-pressure experiments.LiMn_(2)O_(4) was found to have structural stability up to 5 GPa at room temperature.Under ambient pressure,the compound decomposed at 1300℃.The decomposition temperature decreased with increasing pressure,yielding more complex decomposed products.Below the decomposition temperature,the crystal structure of LiMn_(2)O_(4) varied with pressure.The presented results in this study offer new insights into the thermal and pressure stability of LiMn_(2)O_(4) materials as a cathode for lithium-ion batteries that can operate under extreme conditions.Therefore,these findings may serve as a useful guide for future work for improving lithium-ion batteries.
