目的研究特异性环氧化酶-2(COX-2)抑制剂塞来昔布联合莫西沙星对肺炎克雷伯杆菌肺炎大鼠肺部炎症标志物及肺组织病理学的影响。方法健康SPF级SD雄性大鼠60只,分2、4、6 d 3种给药疗程,各疗程20只大鼠随机分为5组:空白对照组(control组)...目的研究特异性环氧化酶-2(COX-2)抑制剂塞来昔布联合莫西沙星对肺炎克雷伯杆菌肺炎大鼠肺部炎症标志物及肺组织病理学的影响。方法健康SPF级SD雄性大鼠60只,分2、4、6 d 3种给药疗程,各疗程20只大鼠随机分为5组:空白对照组(control组)、模型组(model组)、塞来昔布组(Cox组)、莫西沙星组(Mox组)、塞来昔布+莫西沙星组(Cox+Mox组),每组4只。采用直视下气管插管接种肺炎克雷伯杆菌混悬液制作肺炎模型,control组予等量无菌生理盐水接种。药物治疗组在注射细菌混悬液后次日分别腹腔注射塞来昔布及莫西沙星,分别连续2、4、6 d。给药后第3、5、7天分批处死动物,使用ELISA法测定肺组织匀浆细胞因子、环氧化酶代谢产物及热休克蛋白90(HSP90)的水平;取肺组织进行病理学检查。结果2、4、6 d 3种给药疗程的各model组肺湿重/体重均较control组升高(P<0.05),3种给药疗程的各Cox+Mox组与control组比较差异无统计学意义(P>0.05),但均较model组降低(P<0.05)。给药4 d和6 d,model组的C反应蛋白(CRP)、肿瘤坏死因子(TNF)-α、白细胞介素(IL)-6、IL-1β、转化生长因子(TGF)-β、HSP90、前列腺素I_(2)(PGI_(2))、前列腺素E_(2)(PGE_(2))、血栓素A_(2)(TXA_(2))均较control组升高(P<0.05),但IL-10较control组降低(P<0.05);塞来昔布、莫西沙星及两药联合均可降低CRP、TNF-α、IL-6、IL-1β、PGI_(2)、PGE_(2)、TXA_(2)(P<0.05),塞来昔布联合莫西沙星未显示出优于单独使用塞来昔布或莫西沙星。但塞来昔布联合莫西沙星可提高IL-10(P<0.05)。肺组织病理学显示各model组的肺组织均出现明显炎症细胞浸润、肺泡间质出血、局部机化物形成等改变,塞来昔布、莫西沙星及两药联合的上述病理改变均较模型组减轻。结论塞来昔布、莫西沙星及两药联合可降低肺炎克雷伯杆菌肺炎大鼠肺部致炎细胞因子和前列腺素代谢产物水平,塞来昔布联合莫西沙星可提高抗炎因子IL-10水平。与单用塞来昔布或莫西沙星相比,两药联合在降低致炎细胞因子水平及改善肺组织病变作用方面并无显著优势。展开更多
We present a one-dimensional dynamic model of polydisperse granular mixture with the fractal characteristic of the particle size distribution, in which the particles are subject to inelastic mutual collisions and are ...We present a one-dimensional dynamic model of polydisperse granular mixture with the fractal characteristic of the particle size distribution, in which the particles are subject to inelastic mutual collisions and are driven by Gaussian white noise. The inhomogeneity of the particle size distribution is described by a fractal dimension D. The stationary state that the mixture reaches is the result of the balance between energy dissipation and energy injection. By molecular dynamics simulations, we have mainly studied how the inhomogeneity of the particle size distribution and the inelasticity of collisions influence the velocity distribution and distribution of interparticle spacing in the steady-state. The simulation results indicate that, in the inelasticity case, the velocity distribution strongly deviates from the Gaussian one and the system has a strong spatial clustering. Thus the inhomogeneity and the inelasticity have great effacts on the velocity distribution and distribution of interparticle spacing. The quantitative information of the non-Gaussian velocity distribution and that of clustering are respectively represented.展开更多
文摘目的研究特异性环氧化酶-2(COX-2)抑制剂塞来昔布联合莫西沙星对肺炎克雷伯杆菌肺炎大鼠肺部炎症标志物及肺组织病理学的影响。方法健康SPF级SD雄性大鼠60只,分2、4、6 d 3种给药疗程,各疗程20只大鼠随机分为5组:空白对照组(control组)、模型组(model组)、塞来昔布组(Cox组)、莫西沙星组(Mox组)、塞来昔布+莫西沙星组(Cox+Mox组),每组4只。采用直视下气管插管接种肺炎克雷伯杆菌混悬液制作肺炎模型,control组予等量无菌生理盐水接种。药物治疗组在注射细菌混悬液后次日分别腹腔注射塞来昔布及莫西沙星,分别连续2、4、6 d。给药后第3、5、7天分批处死动物,使用ELISA法测定肺组织匀浆细胞因子、环氧化酶代谢产物及热休克蛋白90(HSP90)的水平;取肺组织进行病理学检查。结果2、4、6 d 3种给药疗程的各model组肺湿重/体重均较control组升高(P<0.05),3种给药疗程的各Cox+Mox组与control组比较差异无统计学意义(P>0.05),但均较model组降低(P<0.05)。给药4 d和6 d,model组的C反应蛋白(CRP)、肿瘤坏死因子(TNF)-α、白细胞介素(IL)-6、IL-1β、转化生长因子(TGF)-β、HSP90、前列腺素I_(2)(PGI_(2))、前列腺素E_(2)(PGE_(2))、血栓素A_(2)(TXA_(2))均较control组升高(P<0.05),但IL-10较control组降低(P<0.05);塞来昔布、莫西沙星及两药联合均可降低CRP、TNF-α、IL-6、IL-1β、PGI_(2)、PGE_(2)、TXA_(2)(P<0.05),塞来昔布联合莫西沙星未显示出优于单独使用塞来昔布或莫西沙星。但塞来昔布联合莫西沙星可提高IL-10(P<0.05)。肺组织病理学显示各model组的肺组织均出现明显炎症细胞浸润、肺泡间质出血、局部机化物形成等改变,塞来昔布、莫西沙星及两药联合的上述病理改变均较模型组减轻。结论塞来昔布、莫西沙星及两药联合可降低肺炎克雷伯杆菌肺炎大鼠肺部致炎细胞因子和前列腺素代谢产物水平,塞来昔布联合莫西沙星可提高抗炎因子IL-10水平。与单用塞来昔布或莫西沙星相比,两药联合在降低致炎细胞因子水平及改善肺组织病变作用方面并无显著优势。
基金The project supported by National Natural Science Foundation of China under Grant No. 10675048 and Natural Science Foundation of Xianning College under Grant No. KZ0627
文摘We present a one-dimensional dynamic model of polydisperse granular mixture with the fractal characteristic of the particle size distribution, in which the particles are subject to inelastic mutual collisions and are driven by Gaussian white noise. The inhomogeneity of the particle size distribution is described by a fractal dimension D. The stationary state that the mixture reaches is the result of the balance between energy dissipation and energy injection. By molecular dynamics simulations, we have mainly studied how the inhomogeneity of the particle size distribution and the inelasticity of collisions influence the velocity distribution and distribution of interparticle spacing in the steady-state. The simulation results indicate that, in the inelasticity case, the velocity distribution strongly deviates from the Gaussian one and the system has a strong spatial clustering. Thus the inhomogeneity and the inelasticity have great effacts on the velocity distribution and distribution of interparticle spacing. The quantitative information of the non-Gaussian velocity distribution and that of clustering are respectively represented.
