Ischemic postconditioning renders brain tissue tolerant to brain ischemia,thereby alleviating ischemic brain injury.However,the exact mechanism of action is still unclear.In this study,a rat model of global brain isch...Ischemic postconditioning renders brain tissue tolerant to brain ischemia,thereby alleviating ischemic brain injury.However,the exact mechanism of action is still unclear.In this study,a rat model of global brain ischemia was subjected to ischemic postconditioning treatment using the vessel occlusion method.After 2 hours of ischemia,the bilateral common carotid arteries were blocked immediately for 10 seconds and then perfused for 10 seconds.This procedure was repeated six times.Ischemic postconditioning was found to mitigate hippocampal CA1 neuronal damage in rats with brain ischemia,and up-regulate acid-sensing ion channel 2a expression at the m RNA and protein level.These findings suggest that ischemic postconditioning up-regulates acid-sensing ion channel 2a expression in the rat hippocampus after global brain ischemia,which promotes neuronal tolerance to ischemic brain injury.展开更多
In order to illustrate the ion transport mechanism of chloride channel（Cl C） protein,a type of Cl C protein,Cl C-ec1,from Escherichia coli is embedded into an explicit membranewater system by using software VMD. The...In order to illustrate the ion transport mechanism of chloride channel（Cl C） protein,a type of Cl C protein,Cl C-ec1,from Escherichia coli is embedded into an explicit membranewater system by using software VMD. Then a parallel molecular dynamics（MD） simulation is employed to equilibrate the Cl C-ec1 structure for 27.5 ns at temperature 298.15 K. Based on this equilibrated structure,we compute the channel geometric size variation and electrostatic potential distribution along the channel. Meanwhile,Cl^- transport process is simulated using oriented random walk method under variable external potential. The simulation result shows that Cl^- transport velocity depends on the width of the narrowest channel region. Mutation of negative glutamate E148 can produce positive potential,which is beneficial for Cl^- transport,around external Cl^- binding region in the channel. The simulated current-voltage curves about Cl^- transporting in Cl C-ec1 protein agree with Jayaram＇s experimental results.展开更多
目的:研究Hp(Helicobacter pylori,Hp)感染在胃癌发生发展中的作用。方法:运用实时定量PCR法检测氯离子通道蛋白基因(Chloride ion channel protein,CICP)及β-肌动蛋白基因在50例人胃癌组织的表达,并分析其表达与临床病理特征和胃癌组...目的:研究Hp(Helicobacter pylori,Hp)感染在胃癌发生发展中的作用。方法:运用实时定量PCR法检测氯离子通道蛋白基因(Chloride ion channel protein,CICP)及β-肌动蛋白基因在50例人胃癌组织的表达,并分析其表达与临床病理特征和胃癌组织中Hp感染状态的关系。结果:两个基因在人胃癌组织及淋巴结组织的表达显著高于癌旁组织(P<0.05)。氯离子通道蛋白基因的表达与胃癌患者pTNM分期及患者生存期相关(P<0.05),而β-肌动蛋白基因的表达与pTNM分期及淋巴结转移相关(P<0.05);人胃癌组织中Hp的感染与氯离子通道蛋白及β-肌动蛋白基因的表达上调相关(P<0.05)。结论:Hp的感染可以上调胃癌组织中氯离子通道蛋白及β-肌动蛋白基因的表达,检测这两个基因的表达对预测胃癌患者的预后有一定作用。展开更多
文摘Ischemic postconditioning renders brain tissue tolerant to brain ischemia,thereby alleviating ischemic brain injury.However,the exact mechanism of action is still unclear.In this study,a rat model of global brain ischemia was subjected to ischemic postconditioning treatment using the vessel occlusion method.After 2 hours of ischemia,the bilateral common carotid arteries were blocked immediately for 10 seconds and then perfused for 10 seconds.This procedure was repeated six times.Ischemic postconditioning was found to mitigate hippocampal CA1 neuronal damage in rats with brain ischemia,and up-regulate acid-sensing ion channel 2a expression at the m RNA and protein level.These findings suggest that ischemic postconditioning up-regulates acid-sensing ion channel 2a expression in the rat hippocampus after global brain ischemia,which promotes neuronal tolerance to ischemic brain injury.
基金Supported by the National Natural Science Foundation of China(11304123)the Scientific Research Foundation of Jianghan University(2013016)
文摘In order to illustrate the ion transport mechanism of chloride channel（Cl C） protein,a type of Cl C protein,Cl C-ec1,from Escherichia coli is embedded into an explicit membranewater system by using software VMD. Then a parallel molecular dynamics（MD） simulation is employed to equilibrate the Cl C-ec1 structure for 27.5 ns at temperature 298.15 K. Based on this equilibrated structure,we compute the channel geometric size variation and electrostatic potential distribution along the channel. Meanwhile,Cl^- transport process is simulated using oriented random walk method under variable external potential. The simulation result shows that Cl^- transport velocity depends on the width of the narrowest channel region. Mutation of negative glutamate E148 can produce positive potential,which is beneficial for Cl^- transport,around external Cl^- binding region in the channel. The simulated current-voltage curves about Cl^- transporting in Cl C-ec1 protein agree with Jayaram＇s experimental results.
文摘目的:研究Hp(Helicobacter pylori,Hp)感染在胃癌发生发展中的作用。方法:运用实时定量PCR法检测氯离子通道蛋白基因(Chloride ion channel protein,CICP)及β-肌动蛋白基因在50例人胃癌组织的表达,并分析其表达与临床病理特征和胃癌组织中Hp感染状态的关系。结果:两个基因在人胃癌组织及淋巴结组织的表达显著高于癌旁组织(P<0.05)。氯离子通道蛋白基因的表达与胃癌患者pTNM分期及患者生存期相关(P<0.05),而β-肌动蛋白基因的表达与pTNM分期及淋巴结转移相关(P<0.05);人胃癌组织中Hp的感染与氯离子通道蛋白及β-肌动蛋白基因的表达上调相关(P<0.05)。结论:Hp的感染可以上调胃癌组织中氯离子通道蛋白及β-肌动蛋白基因的表达,检测这两个基因的表达对预测胃癌患者的预后有一定作用。
