In our previous studies, a novel cortex-like Ti O2 coating was prepared on Ti surface through micro-arc oxidation（MAO） by using sodium tetraborate as electrolyte, and the effects of the coating on cell attachment we...In our previous studies, a novel cortex-like Ti O2 coating was prepared on Ti surface through micro-arc oxidation（MAO） by using sodium tetraborate as electrolyte, and the effects of the coating on cell attachment were testified. This study aimed to investigate the effects of this cortex-like MAO coating on osseointegration. A sand-blasting and acid-etching（SLA） coating that has been widely used in clinical practice served as control. Topographical and chemical characterizations were conducted by scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction, contact angle meter, and step profiler. Results showed that the cortex-like coating had microslots and nanopores and it was superhydrophilic, whereas the SLA surface was hydrophobic. The roughness of MAO was similar to that of SLA. The MAO and SLA implants were implanted into the femoral condyles of New Zealand rabbits to evaluate their in-vivo performance through micro-CT, histological analysis, and fluorescent labeling at the bone-implant interface four weeks after surgery. The micro-CT showed that the bone volume ratio and mean trabecular thickness were similar between MAO and SLA groups four weeks after implantation. Histological analysis and fluorescent labeling showed no significant differences in the bone-implant contact between the MAO and SLA surfaces. It was suggested that with micro/nanostructure and superhydrophilicity, the cortex-like MAO coating causes excellent osseointegration, holding a promise of an application to implant modification.展开更多
目的探讨地骨皮对高血糖阿尔茨海默病(AD)小鼠认知功能的改善作用及可能机制。方法8只C57小鼠作为对照组,16只db/db小鼠通过脑室注射20μmol/L的β淀粉样蛋白_(25-35)10μl建立AD模型,并随机分为模型组和干预组(予地骨皮提取物5.0 g/kg...目的探讨地骨皮对高血糖阿尔茨海默病(AD)小鼠认知功能的改善作用及可能机制。方法8只C57小鼠作为对照组,16只db/db小鼠通过脑室注射20μmol/L的β淀粉样蛋白_(25-35)10μl建立AD模型,并随机分为模型组和干预组(予地骨皮提取物5.0 g/kg灌胃处理,1次/d,连续4周),每组8只。注射后第30天检测小鼠血糖,苏木精-伊红染色和TUNEL染色进行病理学评估。水迷宫实验观察小鼠行为学改变,ELISA法检测血清超氧化物歧化酶(SOD)活性和丙二醛(MDA)水平,Western blot检测脑组织氧化应激指标和相关信号通道蛋白表达。结果与对照组比较,模型组2 d开始逃避潜伏期延长,穿越原平台次数和目标象限时间降低(P<0.05)。与模型组比较,干预组2 d开始潜伏期缩短;穿越平台次数和目标象限时间延长(P<0.05)。苏木精-伊红染色和TUNEL染色显示,模型组脑组织可见细胞炎性损伤和凋亡,干预组较模型组减轻。与对照组比较,模型组血清及脑组织中SOD1、SOD2和MDA显著升高;磷酸化磷酸肌醇3激酶(PI3K)、核因子E2相关因子2(Nrf2)和Kelch样环氧氯丙烷相关蛋白1(Keap1)蛋白表达上调(P<0.05);与模型组比较,干预组血清及脑组织中SOD1、SOD2和MDA显著降低;磷酸化PI3K(1.3±0.2 vs 1.8±0.5)、Nrf2(2.2±0.2 vs 2.6±0.3)和Keap1(2.2±0.3 vs 2.7±0.9)蛋白表达降低(P<0.05)。结论地骨皮能改善高血糖AD小鼠认知功能,其作用机制可能与PI3K、Nrf2、Keap1信号通路抗氧化应激反应调控有关。展开更多
基金financially supported by the Research and Development Fund for Applied Technology of Dalian(No.2014E14SF164)National Natural Science Foundation of China(No.51371042 and No.81171008)the Research Fund for the Doctoral Program of Higher Education of China(No.20130041110005)
文摘In our previous studies, a novel cortex-like Ti O2 coating was prepared on Ti surface through micro-arc oxidation（MAO） by using sodium tetraborate as electrolyte, and the effects of the coating on cell attachment were testified. This study aimed to investigate the effects of this cortex-like MAO coating on osseointegration. A sand-blasting and acid-etching（SLA） coating that has been widely used in clinical practice served as control. Topographical and chemical characterizations were conducted by scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction, contact angle meter, and step profiler. Results showed that the cortex-like coating had microslots and nanopores and it was superhydrophilic, whereas the SLA surface was hydrophobic. The roughness of MAO was similar to that of SLA. The MAO and SLA implants were implanted into the femoral condyles of New Zealand rabbits to evaluate their in-vivo performance through micro-CT, histological analysis, and fluorescent labeling at the bone-implant interface four weeks after surgery. The micro-CT showed that the bone volume ratio and mean trabecular thickness were similar between MAO and SLA groups four weeks after implantation. Histological analysis and fluorescent labeling showed no significant differences in the bone-implant contact between the MAO and SLA surfaces. It was suggested that with micro/nanostructure and superhydrophilicity, the cortex-like MAO coating causes excellent osseointegration, holding a promise of an application to implant modification.
文摘目的探讨地骨皮对高血糖阿尔茨海默病(AD)小鼠认知功能的改善作用及可能机制。方法8只C57小鼠作为对照组,16只db/db小鼠通过脑室注射20μmol/L的β淀粉样蛋白_(25-35)10μl建立AD模型,并随机分为模型组和干预组(予地骨皮提取物5.0 g/kg灌胃处理,1次/d,连续4周),每组8只。注射后第30天检测小鼠血糖,苏木精-伊红染色和TUNEL染色进行病理学评估。水迷宫实验观察小鼠行为学改变,ELISA法检测血清超氧化物歧化酶(SOD)活性和丙二醛(MDA)水平,Western blot检测脑组织氧化应激指标和相关信号通道蛋白表达。结果与对照组比较,模型组2 d开始逃避潜伏期延长,穿越原平台次数和目标象限时间降低(P<0.05)。与模型组比较,干预组2 d开始潜伏期缩短;穿越平台次数和目标象限时间延长(P<0.05)。苏木精-伊红染色和TUNEL染色显示,模型组脑组织可见细胞炎性损伤和凋亡,干预组较模型组减轻。与对照组比较,模型组血清及脑组织中SOD1、SOD2和MDA显著升高;磷酸化磷酸肌醇3激酶(PI3K)、核因子E2相关因子2(Nrf2)和Kelch样环氧氯丙烷相关蛋白1(Keap1)蛋白表达上调(P<0.05);与模型组比较,干预组血清及脑组织中SOD1、SOD2和MDA显著降低;磷酸化PI3K(1.3±0.2 vs 1.8±0.5)、Nrf2(2.2±0.2 vs 2.6±0.3)和Keap1(2.2±0.3 vs 2.7±0.9)蛋白表达降低(P<0.05)。结论地骨皮能改善高血糖AD小鼠认知功能,其作用机制可能与PI3K、Nrf2、Keap1信号通路抗氧化应激反应调控有关。
