目的探讨草果知母汤治疗癫痫的作用机制。方法选取SPF级SD雄性大鼠60只,随机分为正常组,模型组,草果知母汤低、中、高剂量组,每组12只。除正常组外,其余4组均制备癫痫模型,造模1 h后给药,正常组、模型组以双蒸水2 m L/kg灌胃,草果知母...目的探讨草果知母汤治疗癫痫的作用机制。方法选取SPF级SD雄性大鼠60只,随机分为正常组,模型组,草果知母汤低、中、高剂量组,每组12只。除正常组外,其余4组均制备癫痫模型,造模1 h后给药,正常组、模型组以双蒸水2 m L/kg灌胃,草果知母汤低、中、高剂量组分别以草果知母汤0.375、0.75、1.5 g/m L生药提取液2 m L/kg灌胃,每日1次,持续28 d。观察各组大鼠癫痫行为学变化,取各组大鼠脑海马组织HE染色进行组织病理学观察,以TUNEL法观察神经细胞凋亡情况,RT-PCR检测mi R-21、mi R-29和凋亡相关基因Bax、Bcl-2、P53 m RNA表达,Wester Blot法检测凋亡相关基因Bax、Bcl-2、P53蛋白表达。结果草果知母汤各剂量组均有改善癫痫大鼠癫痫行为学的作用,可减少海马组织神经细胞凋亡,减少mi R-29、Bax和P53 m RNA的表达(P<0.05或0.01),增加mi R-21和Bcl-2m RNA的表达(P<0.05或0.01),降低Bax、P53蛋白表达(P<0.01)并增加Bcl-2蛋白表达(P<0.01)。结论通过调控mi R-21、mi R-29进而调节凋亡相关基因Bax、Bcl-2、P53的表达,可能是草果知母汤治疗癫痫的作用机制之一。展开更多
Organically modified montmorillonite(OMMT) was incorporated into the complex of 18-crown-6(CE) and polyimide-croum ether(PI[CE]), and its effect on the properties of the complex was evaluated in terms of thermal behav...Organically modified montmorillonite(OMMT) was incorporated into the complex of 18-crown-6(CE) and polyimide-croum ether(PI[CE]), and its effect on the properties of the complex was evaluated in terms of thermal behaviors, coefficient of thermal expansion, mechanical properties, dynamic mechanical properties and water absorption. The results indicate that the overall properties of PI[CE] complex are obviously enhanced. A very low coefficient of thermal expansion of 17.9 ppm/K, a high tensile strength of 124.5 MPa, and toughness of 30.8 MJ/m3 can be achieved for the OMMT/PI[CE] nanocomposite with 3 wt% OMMT. Meanwhile, the thermal stability of the PI[CE] complex is improved, and its 5% weight loss(T_(d5%)) and Tg increase by 10.6 and 23.0 ℃, respectively, and the water absorption rate decreases from 1.73% to 1.13%. The homogeneous dispersion and strong interactions of OMMT with PI[CE] matrix are responsible for the superior properties of the nanocomposites according to SEM and XRD results.展开更多
基金Funded by the National Natural Science Foundation of China(51573054)the Project for Science and Technology of Guangdong Province(2014B090916001)
文摘Organically modified montmorillonite(OMMT) was incorporated into the complex of 18-crown-6(CE) and polyimide-croum ether(PI[CE]), and its effect on the properties of the complex was evaluated in terms of thermal behaviors, coefficient of thermal expansion, mechanical properties, dynamic mechanical properties and water absorption. The results indicate that the overall properties of PI[CE] complex are obviously enhanced. A very low coefficient of thermal expansion of 17.9 ppm/K, a high tensile strength of 124.5 MPa, and toughness of 30.8 MJ/m3 can be achieved for the OMMT/PI[CE] nanocomposite with 3 wt% OMMT. Meanwhile, the thermal stability of the PI[CE] complex is improved, and its 5% weight loss(T_(d5%)) and Tg increase by 10.6 and 23.0 ℃, respectively, and the water absorption rate decreases from 1.73% to 1.13%. The homogeneous dispersion and strong interactions of OMMT with PI[CE] matrix are responsible for the superior properties of the nanocomposites according to SEM and XRD results.
