目的研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids CONR)调控AGEs/p38MAPK信号转导通路改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔氧化应激反...目的研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids CONR)调控AGEs/p38MAPK信号转导通路改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔氧化应激反应。方法设立空白组、模型组、辛伐他汀组、CONR高剂量组、CONR低剂量组、SB203580组;脉推注四氧嘧啶并且配合腹主动脉内膜球囊损伤术诱导雄性纯种新西兰大白兔的DA模型,实验组分别每日给予CONR450 mg/kg、CONR 150 mg/kg;辛伐他汀3 mg/kg灌胃10周,12 h重复腹腔注射SB203580 2 mg/kg10周;正常组每日给予生理盐水20mL灌胃作为对照。结果实验各组对AGEs均有降低作用,对p-p38MAPK蛋白高表达均有抑制作用,与模型组比较差异有统计学意义。CONR高、低剂量组、辛伐他汀组对p-p38MAPK蛋白的抑制作用优于SB203580组(P<0.01),CONR高、CONR低剂量组、辛伐他汀组之间差异无统计学意义(P>0.05)。模型组大兔血清MDA高于空白组,有统计学差异(P<0.01)。给药后,CONR高剂量组、SB203580组及辛伐他汀组显著降低MDA(P<0.01)。模型组SOD活性显著降低(P<0.01),实验各组显著增强SOD活性(P<0.01)。结论冬连三七组分可能通过干预AGEs/p38MAPK信号转导通路改善DA兔的氧化应激反应。展开更多
目的:研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids,CONR)调控AGEs/p38MAPK信号转导通路,改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔血管内皮...目的:研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids,CONR)调控AGEs/p38MAPK信号转导通路,改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔血管内皮损伤的机制。方法:雄性新西兰大白兔分为空白组、模型组、CONR高剂量组、CONR低剂量组、SB203580组、辛伐他汀组;静脉推注四氧嘧啶并且配合腹主动脉内膜球囊损伤术诱导DA模型。CONR高、低剂量组每日分别给予CONR 450 mg/kg、CONR 150 mg/kg灌胃10周;辛伐他汀组给予3 mg/kg辛代他汀灌胃10周;SB203580组给予p38MAPK抑制剂2 mg/kg腹腔注射,12 h重复给药10周;空白组每日给予生理盐水20 ml灌胃。结果:各实验组对AGEs高表达均有降低作用,与模型组比较差异具有统计学意义。各实验组对p-p38MAPK蛋白高表达均有抑制作用,与模型组比较,差异具有统计学差异(P<0.01)。CONR高、辛伐他汀组对p-p38MAPK蛋白的抑制作用优于SB203580组(P<0.01)。CONR低高剂量组、SB203580组及辛伐他汀组显著降低DA大兔ET水平,实验各组NO活性较模型组显著增强(P<0.01)。冬连三七组分明显抑制了DA兔胸主动脉血管内皮细胞的损伤。结论:冬连三七组分可能通过干预AGEs/p38MAPK信号转导通路改善DA兔的血管内皮损伤。展开更多
目的:在既往研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids,CONR)能改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔蛋白非酶糖基化基础上,探讨CONR...目的:在既往研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids,CONR)能改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔蛋白非酶糖基化基础上,探讨CONR减轻RAS系统激活,提高Na^+-K^+-ATPase活性从而保护DA兔心肌组织的机制。方法:予雄性纯种新西兰大白兔高脂饮食并静脉推注四氧嘧啶且行腹主动脉内膜球囊损伤术诱导DA模型,正常组每日给予生理盐水20 m L灌胃作为对照,实验组分别每日给予辛伐他汀3 mg/kg,CONR 450 mg/kg、150 mg/kg、50 mg/kg;灌胃10周。测定各组大兔心脏重量、左心室重量、心体比、左心室/体重指数、心肌血管紧张素Ⅱ(AngⅡ)、Na^+-K^+-ATPase含量及血管紧张素转化酶(ACE)受体在心肌组织的表达,HE染色法观察大兔心肌病理。结果:与模型组比较,CONR大中剂量组可显著降低DA大兔心脏重量、左心室重量、心体比、左心室/体重指数、心肌组织AngⅡ含量(P<0.05),升高心肌Na^+-K^+-ATPase含量(P<0.01),并抑制心肌ACE受体表达(P<0.01);明显改善了DA兔心肌细胞水肿、炎性细胞浸润、心肌间质纤维排列紊乱增生等病理改变。结论:冬连三七组分可能通过抑制蛋白非酶糖基化,减轻RAS系统激活,提高Na^+-K^+-ATPase活性从而改善DA兔的心肌损伤。展开更多
Drying of colloidal droplets often develops versatile depositions.We study the drying deposition of both colloidal droplets containing silica nanoparticles and the silica colloidal droplets with polyethylene oxide(PEO...Drying of colloidal droplets often develops versatile depositions.We study the drying deposition of both colloidal droplets containing silica nanoparticles and the silica colloidal droplets with polyethylene oxide(PEO) additives.We focus on the effect of polymer additives on the deposition formation and the cracking dynamics by using in-situ microscope observation.With PEO additives,a transition from ring-like deposition to uniform deposition is observed,and the cracking dynamics is greatly reduced.The PEO additives enhance the adsorption of particles at the air-water interface,thus forming the network structure at the interface which blocks the outward capillary flow.This contributes to the uniform deposition.Meanwhile,the multi-distribution of the aggregates size enhances the non-homogeneity of the drying film and consequently results in multi-nucleation of cracks.This reduces the stress accumulation that drives the crack propagation and may be responsible for the sluggish cracking dynamics.展开更多
文摘目的:在既往研究冬连三七组分(Composition of Ophiopogon polysaccharide,Notoginseng total saponins and Rhizoma Coptidis alkaloids,CONR)能改善糖尿病动脉粥样硬化(diabetic atherosclerosis,DA)兔蛋白非酶糖基化基础上,探讨CONR减轻RAS系统激活,提高Na^+-K^+-ATPase活性从而保护DA兔心肌组织的机制。方法:予雄性纯种新西兰大白兔高脂饮食并静脉推注四氧嘧啶且行腹主动脉内膜球囊损伤术诱导DA模型,正常组每日给予生理盐水20 m L灌胃作为对照,实验组分别每日给予辛伐他汀3 mg/kg,CONR 450 mg/kg、150 mg/kg、50 mg/kg;灌胃10周。测定各组大兔心脏重量、左心室重量、心体比、左心室/体重指数、心肌血管紧张素Ⅱ(AngⅡ)、Na^+-K^+-ATPase含量及血管紧张素转化酶(ACE)受体在心肌组织的表达,HE染色法观察大兔心肌病理。结果:与模型组比较,CONR大中剂量组可显著降低DA大兔心脏重量、左心室重量、心体比、左心室/体重指数、心肌组织AngⅡ含量(P<0.05),升高心肌Na^+-K^+-ATPase含量(P<0.01),并抑制心肌ACE受体表达(P<0.01);明显改善了DA兔心肌细胞水肿、炎性细胞浸润、心肌间质纤维排列紊乱增生等病理改变。结论:冬连三七组分可能通过抑制蛋白非酶糖基化,减轻RAS系统激活,提高Na^+-K^+-ATPase活性从而改善DA兔的心肌损伤。
基金supported by the National Natural Science Foundation of China (Grant No.51103117)Shaanxi Provincial Natural Science Foundation (Grant No.2012JQ1016)+2 种基金NPU Foundation for Fundamental Research (Grant Nos.JCY20130147 and JC201125)Specialized Research Fund for the Doctoral Program of Higher Education (Grant No.20126102120058)the Research Fund of the State Key Laboratory of Solidification Processing in NWPU (Grant No.SKLSP201217)
文摘Drying of colloidal droplets often develops versatile depositions.We study the drying deposition of both colloidal droplets containing silica nanoparticles and the silica colloidal droplets with polyethylene oxide(PEO) additives.We focus on the effect of polymer additives on the deposition formation and the cracking dynamics by using in-situ microscope observation.With PEO additives,a transition from ring-like deposition to uniform deposition is observed,and the cracking dynamics is greatly reduced.The PEO additives enhance the adsorption of particles at the air-water interface,thus forming the network structure at the interface which blocks the outward capillary flow.This contributes to the uniform deposition.Meanwhile,the multi-distribution of the aggregates size enhances the non-homogeneity of the drying film and consequently results in multi-nucleation of cracks.This reduces the stress accumulation that drives the crack propagation and may be responsible for the sluggish cracking dynamics.