目的:检测m itogen activated prote in k inase k inase 4(MKK-4)、MMP-9基因在原发性肝癌中的表达,探讨原发性肝癌MKK-4与MMP-9 mRNA表达水平间的相互关系,及两者对原发性肝癌侵袭转移的影响。方法:应用逆转录-聚合酶链反应(RT-PCR)检...目的:检测m itogen activated prote in k inase k inase 4(MKK-4)、MMP-9基因在原发性肝癌中的表达,探讨原发性肝癌MKK-4与MMP-9 mRNA表达水平间的相互关系,及两者对原发性肝癌侵袭转移的影响。方法:应用逆转录-聚合酶链反应(RT-PCR)检测34例原发性肝癌癌组织和相应癌旁组织及12例正常肝组织中MKK-4 mRNA、MMP-9 mRNA的表达。结果:癌旁与正常肝组织的MMP-9 mRNA表达差异无显著统计学意义(P>0.05),癌中的MMP-9 mRNA表达增高,且转移癌与未转移癌组间有差异(P<0.05),转移癌组、未转移癌组分别与正常组及癌旁组织比较有差异(P<0.01);MKK-4 mRNA在正常及癌旁组织中表达无差异(P>0.05),转移癌组、未转移癌组分别与正常组及癌旁组比较有差异(P<0.01),转移癌中较未转移癌中的表达低(P<0.05);MKK-4或MMP-9的mRNA表达均与肿瘤的大小、分化无关(P>0.05);MKK-4 mRNA与MMP-9 mRNA的表达有一定的相关性(r=-0.925,P<0.01)。结论:提示MKK-4 mRNA与MMP-9 mRNA的表达改变与原发性肝癌侵袭转移的发生发展有一定的关系。展开更多
目的:探讨p38丝裂原活化蛋白激酶(p38 mitogen-activaced protein kinase,p38MAPK)在表没食子儿茶素没食子酸酯(epigallocatechin-3-gallate,EGCG)诱导人胃癌MGC803细胞凋亡中的作用。方法:采用MTT法检测MGC803细胞的存活率,荧光显微镜...目的:探讨p38丝裂原活化蛋白激酶(p38 mitogen-activaced protein kinase,p38MAPK)在表没食子儿茶素没食子酸酯(epigallocatechin-3-gallate,EGCG)诱导人胃癌MGC803细胞凋亡中的作用。方法:采用MTT法检测MGC803细胞的存活率,荧光显微镜观察和碘化丙啶染色FCM检测MGC803细胞凋亡率,Western印迹法检测MGC803细胞中p38MAPK蛋白及磷酸化p38MAPK蛋白的表达。结果:EGCG可诱导MGC803细胞凋亡,且p38MAPK被激活。用p38MAPK特异性抑制剂SB203580干预后,EGCG抑制MGC803细胞生长的作用明显减弱,细胞凋亡率下降,p38MAPK活性显著下降。结论:EGCG可诱导MGC803细胞凋亡,该作用可被SB203580显著抑制,提示EGCG可能通过激活p38MAPK使部分MGC803细胞凋亡。展开更多
Background Thrombin is a multifunctional serine protease that plays a crucial role in hemostasis following tissue injury.In addition to its procoagulation effect, thrombin is also a potent mesenchymal cell mitogen, th...Background Thrombin is a multifunctional serine protease that plays a crucial role in hemostasis following tissue injury.In addition to its procoagulation effect, thrombin is also a potent mesenchymal cell mitogen, therefore it plays important roles in the local proliferation of mesenchymal cells in the tissue repair process. Reactive oxygen species （ROS） can induce some human cells to proliferate at lower rates while at higher concentrations they promote cells to undergo apoptosis or necrosis. Accumulative evidence suggests that thrombin can induce some cells to produce ROS. Based on these observations, we provide a hypothesis that thrombin can stimulate human lung fibroblasts to produce ROS, which play an important role in human lung fibroblast proliferation.Methods ROS were detected in fibroblasts at 30 minutes and 60 minutes following thrombin （20 U/ml） exposure using flow cytometry. The ratio of reduced glutathione/oxidized glutathione （GSH/GSSG） was assayed in lung fibroblasts using a commercial kit following treatment with thrombin at different concentrations. NADPH oxidase and the extracellular regulated kinase1/2 （ERK1/2） signaling pathway were detected by Western blotting after thrombin stimulation to lung fibroblasts.Results Thrombin, at 20 U/ml, stimulated human lung fibroblasts （HLF） to generate ROS in a time dependent manner.The ratio of GSH/GSSG in fibroblasts treated with thrombin showed a significant decrease. NADPH oxidase was activated and the ERK1/2 signal pathway was involved in the proliferation process of fibroblasts treated with thrombin.Conclusion The activation of NADPH oxidase by thrombin leads to the production of ROS, which promotes fibroblasts proliferation via activation of the ERK1/2 signaling pathway.展开更多
文摘目的:探讨p38丝裂原活化蛋白激酶(p38 mitogen-activaced protein kinase,p38MAPK)在表没食子儿茶素没食子酸酯(epigallocatechin-3-gallate,EGCG)诱导人胃癌MGC803细胞凋亡中的作用。方法:采用MTT法检测MGC803细胞的存活率,荧光显微镜观察和碘化丙啶染色FCM检测MGC803细胞凋亡率,Western印迹法检测MGC803细胞中p38MAPK蛋白及磷酸化p38MAPK蛋白的表达。结果:EGCG可诱导MGC803细胞凋亡,且p38MAPK被激活。用p38MAPK特异性抑制剂SB203580干预后,EGCG抑制MGC803细胞生长的作用明显减弱,细胞凋亡率下降,p38MAPK活性显著下降。结论:EGCG可诱导MGC803细胞凋亡,该作用可被SB203580显著抑制,提示EGCG可能通过激活p38MAPK使部分MGC803细胞凋亡。
文摘Background Thrombin is a multifunctional serine protease that plays a crucial role in hemostasis following tissue injury.In addition to its procoagulation effect, thrombin is also a potent mesenchymal cell mitogen, therefore it plays important roles in the local proliferation of mesenchymal cells in the tissue repair process. Reactive oxygen species （ROS） can induce some human cells to proliferate at lower rates while at higher concentrations they promote cells to undergo apoptosis or necrosis. Accumulative evidence suggests that thrombin can induce some cells to produce ROS. Based on these observations, we provide a hypothesis that thrombin can stimulate human lung fibroblasts to produce ROS, which play an important role in human lung fibroblast proliferation.Methods ROS were detected in fibroblasts at 30 minutes and 60 minutes following thrombin （20 U/ml） exposure using flow cytometry. The ratio of reduced glutathione/oxidized glutathione （GSH/GSSG） was assayed in lung fibroblasts using a commercial kit following treatment with thrombin at different concentrations. NADPH oxidase and the extracellular regulated kinase1/2 （ERK1/2） signaling pathway were detected by Western blotting after thrombin stimulation to lung fibroblasts.Results Thrombin, at 20 U/ml, stimulated human lung fibroblasts （HLF） to generate ROS in a time dependent manner.The ratio of GSH/GSSG in fibroblasts treated with thrombin showed a significant decrease. NADPH oxidase was activated and the ERK1/2 signal pathway was involved in the proliferation process of fibroblasts treated with thrombin.Conclusion The activation of NADPH oxidase by thrombin leads to the production of ROS, which promotes fibroblasts proliferation via activation of the ERK1/2 signaling pathway.
