[目的]观察痛泻要方合四逆散对KK-Ay小鼠胰岛素抵抗及磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶-3β(PI3K/AKT/GSK-3β)信号通路的影响。[方法]采用雄性6~8周龄KK-Ay小鼠建立糖尿病模型,随机分为模型组、中药低中高不同剂量组,另取同...[目的]观察痛泻要方合四逆散对KK-Ay小鼠胰岛素抵抗及磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶-3β(PI3K/AKT/GSK-3β)信号通路的影响。[方法]采用雄性6~8周龄KK-Ay小鼠建立糖尿病模型,随机分为模型组、中药低中高不同剂量组,另取同周龄C57 BL/6J小鼠作为正常组,干预4周后,检测小鼠空腹血糖,空腹胰岛素水平及胰岛功能情况,并通过实时荧光定量反转录聚合酶链式反应(real time PCR),蛋白免疫印迹(Western Blot)等方法检测小鼠肝脏中PI3K、AKT、GSK-3β的基因及蛋白磷酸化水平表达情况。[结果]与正常组相比,模型组小鼠空腹血糖和胰岛素抵抗指数明显升高(P<0.05),而PI3K、AKT、GSK-3β的磷酸化蛋白水平及基因表达水平均明显降低(P<0.05);与模型组相比,中药高剂量组空腹血糖和胰岛素抵抗指数明显降低(P<0.05),而PI3K、AKT、GSK-3β的磷酸化蛋白水平及基因表达水平均明显升高(P<0.05)。[结论]痛泻药方合四逆散可能通过影响PI3K/AKT/GSK-3β信号通路改善KK-Ay小鼠的胰岛素抵抗。展开更多
Background:Liqi Huoxue dripping pill(LQHXDP),a traditional Chinese drug for coronary heart disease,has a protective effect on the heart of rats with myocardial ischemia-reperfusion injury(MIRI)in previous studies;howe...Background:Liqi Huoxue dripping pill(LQHXDP),a traditional Chinese drug for coronary heart disease,has a protective effect on the heart of rats with myocardial ischemia-reperfusion injury(MIRI)in previous studies;however,its mechanism of action remains unclear.The purpose of this study was to investigate the protective mechanism of LQHXDP on MIRI in rats and its relationship with the PI3K/Akt signaling pathway.Methods:In this study,Sprague-Dawley rats were pre-infused with LQHXDP(175 mg/kg/d)for 10 days.PI3K inhibitor LY294002(0.3 mg/kg)was intravenously injected 15 minutes before ischemia.The rat model of MIRI was established by ligating the left anterior descending coronary artery.Subsequently,cardiac hemodynamics,serum myocardial injury markers,inflammatory factors,myocardial infarct size,antioxidant indexes,myocardial histopathology,and phosphorylation levels of key proteins of PI3K/Akt signaling pathway were assessed in rats.Results:LQHXDP was found to improve cardiac hemodynamic indexes,reduce serum creatine kinase MB isoenzyme activity and cardiac troponin and heart-type fatty acid binding protein levels,lower serum interleukin-1 beta,interleukin-6 and tumour necrosis factorαlevels,reduce the myocardial infarct size and enhance the antioxidant capacity of myocardial tissue in MIRI rats.Pathological analysis revealed that LQHXDP attenuated the extent of myocardial injury and protected mitochondria from damage in MIRI rats.Immunoblot analysis revealed that LQHXDP increased the expression levels of p-Akt and p-GSK-3βin MIRI rat cardiomyocytes.PI3K inhibitor LY294002 could impair these effects of LQHXDP.Conclusion:LQHXDP attenuated myocardial injury,attenuated oxidative stress injury and reduced inflammatory response in MIRI rats,and its protective effects were mediated by activating of PI3K/Akt/GSK-3βsignaling pathway.展开更多
NORE1A (RASSF5) is a tumor suppressor of the RASSF family that is often down-regulated in human tumors. NORE1A has multiple roles in controlling cellular homeostasis, one of them being regulating levels of β-catenin ...NORE1A (RASSF5) is a tumor suppressor of the RASSF family that is often down-regulated in human tumors. NORE1A has multiple roles in controlling cellular homeostasis, one of them being regulating levels of β-catenin by binding and modulating the ubiquitin ligase substrate recognition factor β-TrCP. β-catenin is a major executor of the Wnt pathway. The ubiquitin SCF-β-TrCP ligase complex acts on a phospho-degron site in β-catenin that can be phosphorylated by GSK-3β. We now show that in addition to binding β-TrCP, NORE1A also promotes the phosphorylation of the β-catenin phospho-degron by complexing with the kinase GSK-3β. Indeed, NORE1A enhances the formation of a GSK-3β/β-TrCP complex. A structural mutant of NORE1A that retains β-TrCP binding but will no longer interact with GSK-3β inhibits the β-catenin degrading action of NORE1A. The GSK-3β interaction with NORE1A plays an important role in the biology of NORE1A as a GSK-3β inhibitor blocks NORE1A induced senescence. Thus, we identify a new role for the tumor suppressor NORE1A: The regulation of GSK-3β. GSK-3β has many other substrates including multiple transcription factors and co-activators such as p53 and the Hippo component TAZ. The work implies that NORE1A may be able to influence all of them via this new kinase scaffolding interaction.展开更多
文摘[目的]观察痛泻要方合四逆散对KK-Ay小鼠胰岛素抵抗及磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶-3β(PI3K/AKT/GSK-3β)信号通路的影响。[方法]采用雄性6~8周龄KK-Ay小鼠建立糖尿病模型,随机分为模型组、中药低中高不同剂量组,另取同周龄C57 BL/6J小鼠作为正常组,干预4周后,检测小鼠空腹血糖,空腹胰岛素水平及胰岛功能情况,并通过实时荧光定量反转录聚合酶链式反应(real time PCR),蛋白免疫印迹(Western Blot)等方法检测小鼠肝脏中PI3K、AKT、GSK-3β的基因及蛋白磷酸化水平表达情况。[结果]与正常组相比,模型组小鼠空腹血糖和胰岛素抵抗指数明显升高(P<0.05),而PI3K、AKT、GSK-3β的磷酸化蛋白水平及基因表达水平均明显降低(P<0.05);与模型组相比,中药高剂量组空腹血糖和胰岛素抵抗指数明显降低(P<0.05),而PI3K、AKT、GSK-3β的磷酸化蛋白水平及基因表达水平均明显升高(P<0.05)。[结论]痛泻药方合四逆散可能通过影响PI3K/AKT/GSK-3β信号通路改善KK-Ay小鼠的胰岛素抵抗。
基金supported by National Natural Science Foundation of China(Grant No.81860873 and 81960864)the Scientific and Technological Projects of Guizhou Province(Qian Kehe Jichu(2016)1401)High-level Talents Project of Guizhou Province(GUTCM(ZQ2018005)).
文摘Background:Liqi Huoxue dripping pill(LQHXDP),a traditional Chinese drug for coronary heart disease,has a protective effect on the heart of rats with myocardial ischemia-reperfusion injury(MIRI)in previous studies;however,its mechanism of action remains unclear.The purpose of this study was to investigate the protective mechanism of LQHXDP on MIRI in rats and its relationship with the PI3K/Akt signaling pathway.Methods:In this study,Sprague-Dawley rats were pre-infused with LQHXDP(175 mg/kg/d)for 10 days.PI3K inhibitor LY294002(0.3 mg/kg)was intravenously injected 15 minutes before ischemia.The rat model of MIRI was established by ligating the left anterior descending coronary artery.Subsequently,cardiac hemodynamics,serum myocardial injury markers,inflammatory factors,myocardial infarct size,antioxidant indexes,myocardial histopathology,and phosphorylation levels of key proteins of PI3K/Akt signaling pathway were assessed in rats.Results:LQHXDP was found to improve cardiac hemodynamic indexes,reduce serum creatine kinase MB isoenzyme activity and cardiac troponin and heart-type fatty acid binding protein levels,lower serum interleukin-1 beta,interleukin-6 and tumour necrosis factorαlevels,reduce the myocardial infarct size and enhance the antioxidant capacity of myocardial tissue in MIRI rats.Pathological analysis revealed that LQHXDP attenuated the extent of myocardial injury and protected mitochondria from damage in MIRI rats.Immunoblot analysis revealed that LQHXDP increased the expression levels of p-Akt and p-GSK-3βin MIRI rat cardiomyocytes.PI3K inhibitor LY294002 could impair these effects of LQHXDP.Conclusion:LQHXDP attenuated myocardial injury,attenuated oxidative stress injury and reduced inflammatory response in MIRI rats,and its protective effects were mediated by activating of PI3K/Akt/GSK-3βsignaling pathway.
文摘NORE1A (RASSF5) is a tumor suppressor of the RASSF family that is often down-regulated in human tumors. NORE1A has multiple roles in controlling cellular homeostasis, one of them being regulating levels of β-catenin by binding and modulating the ubiquitin ligase substrate recognition factor β-TrCP. β-catenin is a major executor of the Wnt pathway. The ubiquitin SCF-β-TrCP ligase complex acts on a phospho-degron site in β-catenin that can be phosphorylated by GSK-3β. We now show that in addition to binding β-TrCP, NORE1A also promotes the phosphorylation of the β-catenin phospho-degron by complexing with the kinase GSK-3β. Indeed, NORE1A enhances the formation of a GSK-3β/β-TrCP complex. A structural mutant of NORE1A that retains β-TrCP binding but will no longer interact with GSK-3β inhibits the β-catenin degrading action of NORE1A. The GSK-3β interaction with NORE1A plays an important role in the biology of NORE1A as a GSK-3β inhibitor blocks NORE1A induced senescence. Thus, we identify a new role for the tumor suppressor NORE1A: The regulation of GSK-3β. GSK-3β has many other substrates including multiple transcription factors and co-activators such as p53 and the Hippo component TAZ. The work implies that NORE1A may be able to influence all of them via this new kinase scaffolding interaction.
