目的研究高迁移率蛋白1(HMGB1)对缺氧复氧心肌细胞氧化损伤的影响。方法构建H9C2细胞缺氧复氧损伤模型,ELISA法检测培养液上清中HMGB1水平,q RT-PCR检测细胞中HMGB1基因的转录水平。在H9C2细胞中转染HMGB1 si RNA后进行缺氧复氧处理,硫...目的研究高迁移率蛋白1(HMGB1)对缺氧复氧心肌细胞氧化损伤的影响。方法构建H9C2细胞缺氧复氧损伤模型,ELISA法检测培养液上清中HMGB1水平,q RT-PCR检测细胞中HMGB1基因的转录水平。在H9C2细胞中转染HMGB1 si RNA后进行缺氧复氧处理,硫代巴比妥酸比色法检测细胞中丙二醛(MDA)含量,黄嘌呤氧化法检测细胞中超氧化物歧化酶(SOD)含量,二硝基苯肼显色法检测上清中乳酸脱氢酶(LDH)含量,流式细胞术测定细胞凋亡情况,Western blot测定细胞中剪切的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved Caspase-3)、Bcl-2相关X蛋白(Bax)、剪切的含半胱氨酸的天冬氨酸蛋白水解酶9(Cleaved Caspase-9)蛋白水平。结果缺氧复氧后H9C2细胞中HMGB1转录水平升高,细胞分泌的HMGB1水平也升高,与正常培养的细胞相比,差异具有统计学意义(P<0.05);细胞中转染HMGB1 si RNA后可以明显抑制HMGB1的转录和合成;敲低HMGB1可以降低缺氧复氧后的H9C2细胞中MDA水平,促进细胞中SOD合成,减少细胞释放LDH,降低细胞凋亡水平,减少Caspase-3、Caspase-9活化,促进Bax的表达,与单纯缺氧复氧的心肌细胞相比,差异具有统计学意义(P<0.05)。结论缺氧复氧诱导心肌细胞合成HMGB1,敲低HMGB1可以减弱缺氧复氧诱导的心肌细胞凋亡,减轻氧化损伤。展开更多
Scutellarin(SCU), a flavonoid from a traditional Chinese medicinal plant. Our previous study has demonstrated that SCU relaxes mouse aortic arteries mainly in an endothelium-depend-ent manner. In the present study, we...Scutellarin(SCU), a flavonoid from a traditional Chinese medicinal plant. Our previous study has demonstrated that SCU relaxes mouse aortic arteries mainly in an endothelium-depend-ent manner. In the present study, we investigated the vasoprotective effects of SCU against HR-induced endothelial dysfunction(ED) in isolated rat CA and the possible mechanisms involving cyclic guanosine monophosphate(c GMP) dependent protein kinase(PKG). The isolated endothelium-intact and endothelium-denuded rat CA rings were treated with HR injury. Evaluation of endothelium-dependent and-independent vasodilation relaxation of the CA rings were performed using wire myography and the protein expressions were assayed by Western blotting. SCU(10–1 000 μmol·L-1) could relax the endothelium-intact CA rings but not endothelium-denuded ones. In the intact CA rings, the PKG inhibitor, Rp-8-Br-c GMPS(PKGI-rp, 4 μmol·L-1), significantly blocked SCU(10–1 000 μmol·L-1)-induced relaxation. The NO synthase(NOS) inhibitor, NO-nitro-L-arginine methylester(L-NAME, 100 μmol·L-1), did not significantly change the effects of SCU(10–1 000 μmol·L-1). HR treatment significantly impaired ACh-induced relaxation, which was reversed by pre-incubation with SCU(500 μmol·L-1), while HR treatment did not altered NTG-induced vasodilation. PKGI-rp(4 μmol·L-1) blocked the protective effects of SCU in HR-treated CA rings. Additionally, HR treatment reduced phosphorylated vasodilator-stimulated phosphoprotein(p-VASP,phosphorylated product of PKG), which was reversed by SCU pre-incubation, suggesting that SCU activated PKG phosphorylation against HR injury. SCU induces CA vasodilation in an endothelium-dependent manner to and repairs HR-induced impairment via activation of PKG signaling pathway.展开更多
BACKGROUND: Retinoid X receptor(RXR) plays a central role in the regulation of intracellular receptor signaling pathways. The activation of RXR has protective effect on H2O2-induced apoptosis of H9c2 ventricular cells...BACKGROUND: Retinoid X receptor(RXR) plays a central role in the regulation of intracellular receptor signaling pathways. The activation of RXR has protective effect on H2O2-induced apoptosis of H9c2 ventricular cells in rats. But the protective effect and mechanism of activating RXR in cardiomyocytes against hypoxia/reoxygenation(H/R)-induced oxidative iniury are still unclear.METHODS: The model of H/R injury was established through hypoxia for 2 hours and reoxygenation for 4 hours in H9c2 cardiomyocytes of rats. 9-cis-retinoic acid(9-cis RA) was obtained as an RXR agonist, and HX531 as an RXR antagonist. Cultured cardiomyocytes were randomly divided into four groups: sham group, H/R group, H/R+9-cis RA-pretreated group(100 nmol/L 9-cis RA), and H/R+9-cis RA+HX531-pretreated group(2.5 μmol/L HX531). The cell viability was measured by MTT, apoptosis rate of cardiomyocytes by flow cytometry analysis, and mitochondrial membrane potential(ΔΨm) by JC-1 fluorescent probe, and protein expressions of Bcl-2, Bax and cleaved caspase-9 with Western blotting. All measurement data were expressed as mean±standard deviation, and analyzed using one-way ANOVA and the Dunnett test. Differences were considered signif icant when P was <0.05.RESULTS: Pretreatment with RXR agonist enhanced cell viability, reduced apoptosis ratio, and stabled ΔΨm. Dot blotting experiments showed that under H/R stress conditions, Bcl-2 protein level decreased, while Bax and cleaved caspase-9 were increased. 9-cis RA administration before H/R stress prevented these effects, but the protective effects of activating RXR on cardiomyocytes against H/R induced oxidative injury were abolished when pretreated with RXR pan-antagonist HX531.CONCLUSION: The activation of RXR has protective effects against H/R injury in H9c2 cardiomyocytes of rats through attenuating signaling pathway of mitochondria apoptosis.展开更多
目的探讨保元活络方改善心肌缺血再灌注损伤(myocardial ischemia-reperfusion injury,MIRI)的可能作用和机制。方法从TCMSP数据库获取保元活络方(丹参、三七、山楂、黄芪和西洋参)的成分和作用靶点,从GeenCard、OMIM数据库获取MIRI靶点...目的探讨保元活络方改善心肌缺血再灌注损伤(myocardial ischemia-reperfusion injury,MIRI)的可能作用和机制。方法从TCMSP数据库获取保元活络方(丹参、三七、山楂、黄芪和西洋参)的成分和作用靶点,从GeenCard、OMIM数据库获取MIRI靶点,交集获得保元活络方改善MIRI的可能靶点;使用Cytoscape软件构建保元活络方作用MIRI的"成分-靶点"网络,拓扑分析得出关键化合物;使用STRING数据库构建蛋白质-蛋白质相互作用(protein protein interaction,PPI)网络,并导入Cytoscape软件进行优化,聚类分析得出关键靶标;使用ClueGo插件对核心靶标进行GO功能分析和KEGG通路富集分析。缺氧复氧(hypoxia and reoxygenation,H/R)处理大鼠心肌细胞(H9C2)建立MIRI模型,初步验证保元活络方含药血清调控NF-κB通路从线粒体途径抑制H/R诱导的心肌细胞凋亡的作用机制。结果共筛选得到槲皮素、山柰酚、异鼠李素等11个关键化合物,作用靶标51个;PPI网络聚类分析得到2个子网络,涉及CASP3、NOS3、IL-6、ICAM1等16个靶标;GO分析得到体外凋亡信号通路、对活性氧的反应、血管内皮细胞迁移等239个生物学功能;KEGG富集得到TNF信号通路、NF-κB信号通路、VEGF信号通路、PPAR信号通路等63条通路。细胞试验显示,H/R处理后,各组H9C2心肌细胞的细胞活力降低,细胞凋亡增加,caspase-3、caspase-9活性增强,NF-κB p65、caspase-3和caspase-9蛋白表达水平增加,IκBα、Bcl-2蛋白表达水平降低;而保元活络方含药血清干预可逆转H/R诱导的上述损伤。结论保元活络方可以通过多成分-靶点-通路的途径,发挥抗炎、抗氧化应激、抗细胞凋亡和改善冠脉血管内皮功能等作用从而改善MIRI,其中调控NF-κB通路,从线粒体途径抑制H/R诱导的心肌细胞凋亡可能是其关键机制。展开更多
文摘目的研究高迁移率蛋白1(HMGB1)对缺氧复氧心肌细胞氧化损伤的影响。方法构建H9C2细胞缺氧复氧损伤模型,ELISA法检测培养液上清中HMGB1水平,q RT-PCR检测细胞中HMGB1基因的转录水平。在H9C2细胞中转染HMGB1 si RNA后进行缺氧复氧处理,硫代巴比妥酸比色法检测细胞中丙二醛(MDA)含量,黄嘌呤氧化法检测细胞中超氧化物歧化酶(SOD)含量,二硝基苯肼显色法检测上清中乳酸脱氢酶(LDH)含量,流式细胞术测定细胞凋亡情况,Western blot测定细胞中剪切的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved Caspase-3)、Bcl-2相关X蛋白(Bax)、剪切的含半胱氨酸的天冬氨酸蛋白水解酶9(Cleaved Caspase-9)蛋白水平。结果缺氧复氧后H9C2细胞中HMGB1转录水平升高,细胞分泌的HMGB1水平也升高,与正常培养的细胞相比,差异具有统计学意义(P<0.05);细胞中转染HMGB1 si RNA后可以明显抑制HMGB1的转录和合成;敲低HMGB1可以降低缺氧复氧后的H9C2细胞中MDA水平,促进细胞中SOD合成,减少细胞释放LDH,降低细胞凋亡水平,减少Caspase-3、Caspase-9活化,促进Bax的表达,与单纯缺氧复氧的心肌细胞相比,差异具有统计学意义(P<0.05)。结论缺氧复氧诱导心肌细胞合成HMGB1,敲低HMGB1可以减弱缺氧复氧诱导的心肌细胞凋亡,减轻氧化损伤。
基金supported by the National Natural Science Foundation of China(Nos.30960450,81173110)Yunnan Provincial Science and Technology Department(Nos.2011FA 022,2012BC012,2014FA010,2014FB037,2014BC012)
文摘Scutellarin(SCU), a flavonoid from a traditional Chinese medicinal plant. Our previous study has demonstrated that SCU relaxes mouse aortic arteries mainly in an endothelium-depend-ent manner. In the present study, we investigated the vasoprotective effects of SCU against HR-induced endothelial dysfunction(ED) in isolated rat CA and the possible mechanisms involving cyclic guanosine monophosphate(c GMP) dependent protein kinase(PKG). The isolated endothelium-intact and endothelium-denuded rat CA rings were treated with HR injury. Evaluation of endothelium-dependent and-independent vasodilation relaxation of the CA rings were performed using wire myography and the protein expressions were assayed by Western blotting. SCU(10–1 000 μmol·L-1) could relax the endothelium-intact CA rings but not endothelium-denuded ones. In the intact CA rings, the PKG inhibitor, Rp-8-Br-c GMPS(PKGI-rp, 4 μmol·L-1), significantly blocked SCU(10–1 000 μmol·L-1)-induced relaxation. The NO synthase(NOS) inhibitor, NO-nitro-L-arginine methylester(L-NAME, 100 μmol·L-1), did not significantly change the effects of SCU(10–1 000 μmol·L-1). HR treatment significantly impaired ACh-induced relaxation, which was reversed by pre-incubation with SCU(500 μmol·L-1), while HR treatment did not altered NTG-induced vasodilation. PKGI-rp(4 μmol·L-1) blocked the protective effects of SCU in HR-treated CA rings. Additionally, HR treatment reduced phosphorylated vasodilator-stimulated phosphoprotein(p-VASP,phosphorylated product of PKG), which was reversed by SCU pre-incubation, suggesting that SCU activated PKG phosphorylation against HR injury. SCU induces CA vasodilation in an endothelium-dependent manner to and repairs HR-induced impairment via activation of PKG signaling pathway.
基金supported by grants from the National Natural Science Foundation of China(81270282,81070176,30600242,81170192,81200163)Wenzhou Science Technology Bureau Foundation(Y20100010)Education Foundation of Zhejiang Province(Y200906376)
文摘BACKGROUND: Retinoid X receptor(RXR) plays a central role in the regulation of intracellular receptor signaling pathways. The activation of RXR has protective effect on H2O2-induced apoptosis of H9c2 ventricular cells in rats. But the protective effect and mechanism of activating RXR in cardiomyocytes against hypoxia/reoxygenation(H/R)-induced oxidative iniury are still unclear.METHODS: The model of H/R injury was established through hypoxia for 2 hours and reoxygenation for 4 hours in H9c2 cardiomyocytes of rats. 9-cis-retinoic acid(9-cis RA) was obtained as an RXR agonist, and HX531 as an RXR antagonist. Cultured cardiomyocytes were randomly divided into four groups: sham group, H/R group, H/R+9-cis RA-pretreated group(100 nmol/L 9-cis RA), and H/R+9-cis RA+HX531-pretreated group(2.5 μmol/L HX531). The cell viability was measured by MTT, apoptosis rate of cardiomyocytes by flow cytometry analysis, and mitochondrial membrane potential(ΔΨm) by JC-1 fluorescent probe, and protein expressions of Bcl-2, Bax and cleaved caspase-9 with Western blotting. All measurement data were expressed as mean±standard deviation, and analyzed using one-way ANOVA and the Dunnett test. Differences were considered signif icant when P was <0.05.RESULTS: Pretreatment with RXR agonist enhanced cell viability, reduced apoptosis ratio, and stabled ΔΨm. Dot blotting experiments showed that under H/R stress conditions, Bcl-2 protein level decreased, while Bax and cleaved caspase-9 were increased. 9-cis RA administration before H/R stress prevented these effects, but the protective effects of activating RXR on cardiomyocytes against H/R induced oxidative injury were abolished when pretreated with RXR pan-antagonist HX531.CONCLUSION: The activation of RXR has protective effects against H/R injury in H9c2 cardiomyocytes of rats through attenuating signaling pathway of mitochondria apoptosis.
文摘目的探讨保元活络方改善心肌缺血再灌注损伤(myocardial ischemia-reperfusion injury,MIRI)的可能作用和机制。方法从TCMSP数据库获取保元活络方(丹参、三七、山楂、黄芪和西洋参)的成分和作用靶点,从GeenCard、OMIM数据库获取MIRI靶点,交集获得保元活络方改善MIRI的可能靶点;使用Cytoscape软件构建保元活络方作用MIRI的"成分-靶点"网络,拓扑分析得出关键化合物;使用STRING数据库构建蛋白质-蛋白质相互作用(protein protein interaction,PPI)网络,并导入Cytoscape软件进行优化,聚类分析得出关键靶标;使用ClueGo插件对核心靶标进行GO功能分析和KEGG通路富集分析。缺氧复氧(hypoxia and reoxygenation,H/R)处理大鼠心肌细胞(H9C2)建立MIRI模型,初步验证保元活络方含药血清调控NF-κB通路从线粒体途径抑制H/R诱导的心肌细胞凋亡的作用机制。结果共筛选得到槲皮素、山柰酚、异鼠李素等11个关键化合物,作用靶标51个;PPI网络聚类分析得到2个子网络,涉及CASP3、NOS3、IL-6、ICAM1等16个靶标;GO分析得到体外凋亡信号通路、对活性氧的反应、血管内皮细胞迁移等239个生物学功能;KEGG富集得到TNF信号通路、NF-κB信号通路、VEGF信号通路、PPAR信号通路等63条通路。细胞试验显示,H/R处理后,各组H9C2心肌细胞的细胞活力降低,细胞凋亡增加,caspase-3、caspase-9活性增强,NF-κB p65、caspase-3和caspase-9蛋白表达水平增加,IκBα、Bcl-2蛋白表达水平降低;而保元活络方含药血清干预可逆转H/R诱导的上述损伤。结论保元活络方可以通过多成分-靶点-通路的途径,发挥抗炎、抗氧化应激、抗细胞凋亡和改善冠脉血管内皮功能等作用从而改善MIRI,其中调控NF-κB通路,从线粒体途径抑制H/R诱导的心肌细胞凋亡可能是其关键机制。
