To investigate whether apoptosis is associated with cell adhesion in bronchial epithelium, and whether it contributes to the kinetics of injury and repair of surface epithelia, this study was performed for E-cadherin ...To investigate whether apoptosis is associated with cell adhesion in bronchial epithelium, and whether it contributes to the kinetics of injury and repair of surface epithelia, this study was performed for E-cadherin expression by using immunohistochemistry technique and for apoptosis by TUNEL method An animal model of smoking was used for this study The results showed that epithelial cells with membrane anchored E-cadherin decreased remarkably at several time points during 6 months of exposure to smoke ( P< 0 01) and then restored to normal level This fluctuation was associated exclusively with the alteration in number of apoptotic cells ( P <0 01) There was no significant difference in activation of nuclear transcription factor NF-kappa B among groups ( P> 0 05) All these suggested that apoptosis is associated with E-cadherin expression in bronchial epithelium of smoking mouse展开更多
目的探讨苯并芘(Benzo[a]pyrene,BaP)作用下的人支气管上皮细胞(16HBE)热休克蛋白70(Heatshock protein 70,Hsp70)和着色性干皮病G蛋白(Xeroderma pigmentosum group G,XPG)表达的时间效应特征,并分析二者之间可能存在的关联性。方法用8...目的探讨苯并芘(Benzo[a]pyrene,BaP)作用下的人支气管上皮细胞(16HBE)热休克蛋白70(Heatshock protein 70,Hsp70)和着色性干皮病G蛋白(Xeroderma pigmentosum group G,XPG)表达的时间效应特征,并分析二者之间可能存在的关联性。方法用8μmol/L BaP处理16HBE细胞0、1、2、4、8、12、24和48 h,以彗星实验检测细胞DNA损伤并以Olive尾矩值(Olive Tail Moments,OTM)评价DNA损伤程度,以Western-blot检测Hsp70和XPG的表达水平,并以激光共聚焦法检测二者的共定位。结果染毒1～2h时OTM值变化率最大,与正常细胞相比,除染毒1h组外其余各组OTM值均显著性增高(P﹤0.01);Hsp70和XPG的表达随染毒时间逐渐增高,12 h时达到峰值,激光共聚焦结果显示BaP染毒细胞后Hsp70和XPG的结合在细胞核内增强。结论在该试验条件下,XPG在执行核苷酸切除修复作用时可能有Hsp70的参与,其具体机制还有待其他实验进一步加以证实。展开更多
[目的]观察苯并(a)芘(BaP)作用下人支气管上皮细胞(16HBE)蛋白表达谱的改变。[方法]以0、1、2、4、8、16、32、64μmol/L的BaP染毒细胞24h,应用双向凝胶电泳和ImageMaster软件分析BaP处理后细胞内蛋白质表达谱的改变,基质辅助激光解吸...[目的]观察苯并(a)芘(BaP)作用下人支气管上皮细胞(16HBE)蛋白表达谱的改变。[方法]以0、1、2、4、8、16、32、64μmol/L的BaP染毒细胞24h,应用双向凝胶电泳和ImageMaster软件分析BaP处理后细胞内蛋白质表达谱的改变,基质辅助激光解吸附电离-飞行时间质谱(matrix-assisted laser desorption/ionization time of flight mass spectrometry,MALDI-TOF)结合数据库检索鉴定差异表达蛋白质斑点。[结果]各浓度染毒组与对照组相比,成功鉴定了17个差异表达蛋白质斑点,其中表达上调的有9种,下调的有8种。这些蛋白质包括细胞骨架蛋白、与能量代谢有关的蛋白、与DNA损伤修复有关的蛋白、肿瘤标志物、伴侣蛋白、与信号转导有关的蛋白和与氧化应激有关的蛋白。[结论]BaP作用于16HBE后导致与细胞损伤、DNA修复、应激、细胞恶性转化等有关的蛋白质表达发生改变。展开更多
文摘To investigate whether apoptosis is associated with cell adhesion in bronchial epithelium, and whether it contributes to the kinetics of injury and repair of surface epithelia, this study was performed for E-cadherin expression by using immunohistochemistry technique and for apoptosis by TUNEL method An animal model of smoking was used for this study The results showed that epithelial cells with membrane anchored E-cadherin decreased remarkably at several time points during 6 months of exposure to smoke ( P< 0 01) and then restored to normal level This fluctuation was associated exclusively with the alteration in number of apoptotic cells ( P <0 01) There was no significant difference in activation of nuclear transcription factor NF-kappa B among groups ( P> 0 05) All these suggested that apoptosis is associated with E-cadherin expression in bronchial epithelium of smoking mouse
文摘[目的]观察苯并(a)芘(BaP)作用下人支气管上皮细胞(16HBE)蛋白表达谱的改变。[方法]以0、1、2、4、8、16、32、64μmol/L的BaP染毒细胞24h,应用双向凝胶电泳和ImageMaster软件分析BaP处理后细胞内蛋白质表达谱的改变,基质辅助激光解吸附电离-飞行时间质谱(matrix-assisted laser desorption/ionization time of flight mass spectrometry,MALDI-TOF)结合数据库检索鉴定差异表达蛋白质斑点。[结果]各浓度染毒组与对照组相比,成功鉴定了17个差异表达蛋白质斑点,其中表达上调的有9种,下调的有8种。这些蛋白质包括细胞骨架蛋白、与能量代谢有关的蛋白、与DNA损伤修复有关的蛋白、肿瘤标志物、伴侣蛋白、与信号转导有关的蛋白和与氧化应激有关的蛋白。[结论]BaP作用于16HBE后导致与细胞损伤、DNA修复、应激、细胞恶性转化等有关的蛋白质表达发生改变。
