目的:探讨新型信号转导和转录活化因子3(signal transducer and activator of transcription,STAT3)抑制剂HJC0152对人头颈部鳞癌(head and neck squamous cell carcinoma,HNSCC)细胞株侵袭和迁移能力的影响及可能机制。方法:实验分为...目的:探讨新型信号转导和转录活化因子3(signal transducer and activator of transcription,STAT3)抑制剂HJC0152对人头颈部鳞癌(head and neck squamous cell carcinoma,HNSCC)细胞株侵袭和迁移能力的影响及可能机制。方法:实验分为二甲基亚砜(DMSO)组和HJC0152组。Western blot检测细胞总蛋白中STAT3、p-STAT3 Tyr705/Ser727、MMP-2/9、N/E-cadherin、TWIST1和vimentin蛋白表达水平及核浆蛋白中的STAT3和p-STAT3 Tyr705/Ser727蛋白表达水平;划痕实验和Transwell实验检测细胞侵袭、迁移能力;免疫荧光实验观察N/E-cadherin蛋白的表达和亚细胞定位。结果:HJC0152组细胞总蛋白和核浆蛋白p-STAT3 Tyr705表达水平均受到显著抑制,而STAT3、p-STAT3 Ser727未见明显变化;总蛋白MMP-2/9、N-cadherin、TWIST1和vimentin表达水平降低,E-cadherin水平升高。HJC0152组细胞向划痕中央移动的距离明显短于DMSO组,通过Transwell小室聚碳酸酯膜的细胞较DMSO组也显著减少。结论:HJC0152可有效抑制头颈鳞癌细胞STAT3 Tyr705的磷酸化,阻碍其发挥转录因子的作用,抑制其下游基因表达,从而干预HNSCC侵袭和迁移能力。展开更多
A novel phosphor of un-doped Sr Zr Si2O7 material with blue long lasting phosphorescence which could be recorded for about 5400 s（0.32 mcd/m^2） was developed. It revealed that both the emission centers and traps lev...A novel phosphor of un-doped Sr Zr Si2O7 material with blue long lasting phosphorescence which could be recorded for about 5400 s（0.32 mcd/m^2） was developed. It revealed that both the emission centers and traps levels were related to the oxygen-deficient defects which were induced in reducing atmosphere. The filling and fading experiments indicated that the traps levels in Sr Zr Si2O7 were continuous in distribution. The influence of shallow traps on deep traps was investigated and the important role of the bridge effect was revealed. The un-doped Sr Zr Si2O7 material obtained in reducing atmosphere showed potential application as a cheap blue long lasting phosphorescence phosphor.展开更多
基金supported by the National Natural Science Young Foundation of China(51202099)the Gansu Provincial Department of Finance Project(BH2012-017)the Gansu Province University Research Foundation(2013B-059)
文摘A novel phosphor of un-doped Sr Zr Si2O7 material with blue long lasting phosphorescence which could be recorded for about 5400 s（0.32 mcd/m^2） was developed. It revealed that both the emission centers and traps levels were related to the oxygen-deficient defects which were induced in reducing atmosphere. The filling and fading experiments indicated that the traps levels in Sr Zr Si2O7 were continuous in distribution. The influence of shallow traps on deep traps was investigated and the important role of the bridge effect was revealed. The un-doped Sr Zr Si2O7 material obtained in reducing atmosphere showed potential application as a cheap blue long lasting phosphorescence phosphor.
