气管滴注纳米二氧化钛对载脂蛋白E基因敲除小鼠脂代谢的影响  被引量:3

Effect of nano-TiO2 intratracheal instillation on lipid metabolism of AopE gene-knockout mice

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作  者:胡洁琼[1] 陈春英[2] 白茹[2] 甄森[1] 杜仙梅[1] 臧嘉捷[1] 李久存[1] 顾依群[3] 贾光[1] 

机构地区:[1]北京大学公共卫生学院劳动卫生与环境卫生学系,100191 [2]国家纳米科学中心纳米材料生物效应与安全性联合实验室 [3]北京市海淀区妇幼保健院病理科

出  处:《中华预防医学杂志》2010年第9期780-784,共5页Chinese Journal of Preventive Medicine

基  金:国家自然科学基金(30771787);人造纳米材料的生物安全性研究及解决方案探索(2006CB705600)

摘  要:目的 利用载脂蛋白E(ApoE)基因敲除小鼠,观察气管滴注纳米二氧化钛(nano-TiO2)颗粒物对脂代谢、动脉粥样硬化症发展的影响及其机制.方法 nano-TiO2超声配成磷酸缓冲液(PBS)悬浮液用于染毒;46只无特定病原体(specific pathogen free,SPF)级11周龄的雄性AopE基因敲除小鼠,按体重应用随机数字表法分为非处理组(8只)、PBS溶剂对照组(9只)、高剂量组(1.0 mg/ml,10只)、中剂量组(0.5 mg/ml,10只)、低剂量组(0.1 mg/ml,9只).除非处理组外,其余各组以每周2次,每次0.05 ml,分别进行无创气管滴注染毒6周,观察各组小鼠体重、血清总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)、附睾周围脂肪体重比的变化,并进行主动脉动脉粥样病理观察.结果 染毒5周后,高剂量组小鼠体重[(29.7±1. 9)g]较PBS对照组[(31.3±1.9)g]和低剂量组[(31.4±1.4)g]下降,差异有统计学意义(t值分别为-1.58、-1.17,P值均〈0.05);6周后,高剂量组[(28.8±1. 5)g]与PBS对照组[(30.4±1.9)g]、非处理组[(30.2±1.3)g]及低剂量组[(30.6±1.0)g]比较,体重下降,差异有统计学意义(t值分别为-1.60、-1.43、-1.83,P值均〈0.05).6周后,非处理组、PBS对照组、高剂量组、中剂量组和低剂量组TC含量分别为(2.92±1. 18)、(3.12±0.73)、(4.19±1.86)、(3.46±0.72)、(2.57±0.64)mmol/L;TG为(0.39±0.13)、(0.39±0.08)、(0.60±0.21)、(0.55±0.19)、(0.41±0.11)mmol/L;HDL-C为(1.67±0.45)、(1.54±0.67)、(0.93±0.50)、(1.02±0.48)、(1.31±0.64)mmol/L,高剂量组TG高于非处理组(t=1.27,P=0.03)和低剂量组(t=1.62,P=0.01),TC高于PBS组(t=0.22,P=0.01)、非处理组(t=0.22,P=0.04)和低剂量组(t=0.20,P=0.03),HDL-C低于PBS对照组(t=-0.61,P=0.04)和非处理组(t=-0.74,P=0.04);中剂量组TG高于PBS组(t=0.1Objective To investigate the effect of nano-TiO2 intratracheal instillation on the progression of dyslipidemia and atherosclerosis in apolipoprotein E-knockout mice. Methods The nano-TiO2 was ultrasouded with phosphate-buffered saline solutions (PBS) into its suspension for exposure. A total of 46 specific pathogen free (SPF) level of 11-week-old male apolipoprotein E-knockout mice were randomly divided into groups by their body weights: non-treatment group (8 mice) ,PBS control group (9 mice) ,high dose group (1.0 mg/ml, 10 mice), medium dose group (0. 5 mg/ml, 10 mice), and low dose group (0. 1 mg/ml,9 mice). Except the non-treatment group, mice from other groups were intratracheally instilled with 0. 05 ml each time, twice a week. After exposure of 6 weeks, viscera index, blood TC, TG, HDL-C,LDL-C,and organic lipid ratio were assessed as biomarkers. Artery and aortic root issues were assessed by histopathology. Results After 5 weeks exposure, mice body weights in high dose group ((29. 7 ± 1.9) g)started to drop, compared to PBS control ((31.3 ± 1.9) g, t = - 1.58, P 〈 0. 05) and low dose group ((31.4 ± 1.4) g,t = - 1.17, P 〈 0. 05); after 6 weeks, high dose group ((28. 8 ± 1.5) g) was lower than PBS control ((30. 4 ± 1.9) g, t = - 1.60, P 〈 0. 05), non-treatment group ((30. 2 ± 1.3) g, t = - 1.43, P 〈0. 05) and low dose group ((30. 6 ± 1.0)g,t = - 1.83 ,P 〈0. 05). TC levels of non-treatment,PBS control,high dose group, medium dose group and low dose group were (2. 92 ± 1.18), (3. 12 ± 0. 73), (4. 19 ±1.86), (3.46 ± 0. 72) and (2. 57 ± 0. 64) mmol/L, respectively; TG levels were (0. 39 ± 0. 13), (0. 39 ±0.08),(0.60 ±0.21), (0.55 ±0. 19) and (0.41 ±0. 11) mmol/L,respectively; HDL-C levels were (1.67 ±0. 45) ,(1.54 ±0. 67), (0. 93 ±0. 50) ,(1.02 ±0. 48) and (1.31 ±0. 64) mmol/L; TG levels of high dose group were higher than that of non-tr

关 键 词:纳米结构  小鼠 基因敲除 滴注 药物 血脂异常 

分 类 号:R114[医药卫生—卫生毒理学]

 

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