目的观察银盏心脉滴丸对大鼠心肌细胞(H9C2)mTORC1/4EBP1信号通路的影响以探讨其对线粒体功能的机制。方法制备银盏心脉滴丸含药血清。将细胞分为对照组、模型组(缺氧/复氧)、空白血清组及银盏心脉滴丸含药血清组。制备缺氧/复氧细胞损...目的观察银盏心脉滴丸对大鼠心肌细胞(H9C2)mTORC1/4EBP1信号通路的影响以探讨其对线粒体功能的机制。方法制备银盏心脉滴丸含药血清。将细胞分为对照组、模型组(缺氧/复氧)、空白血清组及银盏心脉滴丸含药血清组。制备缺氧/复氧细胞损伤模型,利用激光共聚焦检测线粒体膜电位(ΔΨm),利用流式细胞仪检测活性氧(reactive oxygen species, ROS),运用Western Blot技术检测细胞雷帕霉素靶蛋白(mammalian target of rapamycin, mTOR)、真核翻译起始因子4E结合蛋白(eukaryotic translation initiation factor 4E-binding proteins,4E-BP)、mTOR复合体蛋白(regulatory-associated protein of mammalian target of rapamycin,Raptor)蛋白表达,运用q-PCR方法检测mTORC1、4EBP1、Raptor的mRNA含量。结果与对照组相比,模型组细胞内绿色荧光增强,ΔΨm显著高于对照组(P<0.05);而与模型组相比,银盏心脉滴丸组红色荧光增强(P<0.05),说明银盏心脉保护ΔΨm稳定,保护线粒体膜结构;与对照组相比,模型组的ROS合成较对照组升高(P<0.05);而与模型组相比,银盏心脉滴丸组细胞内ROS产生明显降低(P<0.05);与对照组相比,模型组mTOR、Raptor基因mRNA水平下调(P<0.05),4ebp1基因mRNA水平上调,差异有统计学意义(P<0.05)。与模型组比较,银盏心脉滴丸组mTOR、Raptor基因mRNA水平上调(P<0.05),4ebp1基因mRNA水平下调(P<0.05)。结论银盏心脉滴丸改善缺氧复氧损伤的机制可能是通过激活mTORC1/4EBP1信号通路,从而抑制线粒体膜电位,改善活性氧,保护线粒体功能。展开更多
The authors investigated the influence of green tea polyphenols (GTPs) on the liver mitochondria permeability transition pore (PTP) opening through mitochondria swelling and change of mitochondria membrane potential. ...The authors investigated the influence of green tea polyphenols (GTPs) on the liver mitochondria permeability transition pore (PTP) opening through mitochondria swelling and change of mitochondria membrane potential. The data showed that GTPs had obvious protective effect on the Ca 2+-induced PTP opening in a dose-dependent manner detected by mitochondria swelling. The results were obtained by measuring the change of mitochondria membrane potential through Rh 123. Further experiments were conducted to examine the detailed influence of GTPs on Ca 2+import and export of mitochondria. The results showed that GTPs had remarkably inhibitory effect on the Ca 2+-induced Ca 2+ import in mitochondria; and that they could accelerate Ca 2+-release from mitochondria. Our data provide an alternate interpretation of the potent protective function of GTPs on cell against apoptosis.展开更多
在大鼠肝细胞培养液中加入不同浓度乐果,染毒12、24 h后,检测肝细胞凋亡率、细胞内Ca^2＋浓度、活性氧（ROS）及线粒体膜电位（Δψm）变化,并观察凋亡细胞。结果表明：染毒后肝细胞出现了凋亡变化;细胞凋亡率明显升高,除3μmol.L^-1组...在大鼠肝细胞培养液中加入不同浓度乐果,染毒12、24 h后,检测肝细胞凋亡率、细胞内Ca^2＋浓度、活性氧（ROS）及线粒体膜电位（Δψm）变化,并观察凋亡细胞。结果表明：染毒后肝细胞出现了凋亡变化;细胞凋亡率明显升高,除3μmol.L^-1组外,其余各处理组与对照组相比差异显著,且呈时间-剂量效应;3μmol.L^-1组细胞内Ca^2＋浓度极显著高于对照组,之后随染毒剂量的增加,细胞内Ca^2＋浓度逐渐下降;ROS水平为3-100μmol.L^-1时随染毒剂量的增大和染毒时间的延长而升高,而300μmol.L^-1组略有下降,除3μmol.L^-1组外,其余各处理组与对照组相比差异均极显著;Δψm除24 h 300μmol.L^-1组外其余各处理组均持续下降。表明低剂量乐果可诱导肝细胞凋亡,细胞内Ca^2＋、ROS和Δψm也可能参与这一过程。展开更多
文摘目的观察银盏心脉滴丸对大鼠心肌细胞(H9C2)mTORC1/4EBP1信号通路的影响以探讨其对线粒体功能的机制。方法制备银盏心脉滴丸含药血清。将细胞分为对照组、模型组(缺氧/复氧)、空白血清组及银盏心脉滴丸含药血清组。制备缺氧/复氧细胞损伤模型,利用激光共聚焦检测线粒体膜电位(ΔΨm),利用流式细胞仪检测活性氧(reactive oxygen species, ROS),运用Western Blot技术检测细胞雷帕霉素靶蛋白(mammalian target of rapamycin, mTOR)、真核翻译起始因子4E结合蛋白(eukaryotic translation initiation factor 4E-binding proteins,4E-BP)、mTOR复合体蛋白(regulatory-associated protein of mammalian target of rapamycin,Raptor)蛋白表达,运用q-PCR方法检测mTORC1、4EBP1、Raptor的mRNA含量。结果与对照组相比,模型组细胞内绿色荧光增强,ΔΨm显著高于对照组(P<0.05);而与模型组相比,银盏心脉滴丸组红色荧光增强(P<0.05),说明银盏心脉保护ΔΨm稳定,保护线粒体膜结构;与对照组相比,模型组的ROS合成较对照组升高(P<0.05);而与模型组相比,银盏心脉滴丸组细胞内ROS产生明显降低(P<0.05);与对照组相比,模型组mTOR、Raptor基因mRNA水平下调(P<0.05),4ebp1基因mRNA水平上调,差异有统计学意义(P<0.05)。与模型组比较,银盏心脉滴丸组mTOR、Raptor基因mRNA水平上调(P<0.05),4ebp1基因mRNA水平下调(P<0.05)。结论银盏心脉滴丸改善缺氧复氧损伤的机制可能是通过激活mTORC1/4EBP1信号通路,从而抑制线粒体膜电位,改善活性氧,保护线粒体功能。
文摘The authors investigated the influence of green tea polyphenols (GTPs) on the liver mitochondria permeability transition pore (PTP) opening through mitochondria swelling and change of mitochondria membrane potential. The data showed that GTPs had obvious protective effect on the Ca 2+-induced PTP opening in a dose-dependent manner detected by mitochondria swelling. The results were obtained by measuring the change of mitochondria membrane potential through Rh 123. Further experiments were conducted to examine the detailed influence of GTPs on Ca 2+import and export of mitochondria. The results showed that GTPs had remarkably inhibitory effect on the Ca 2+-induced Ca 2+ import in mitochondria; and that they could accelerate Ca 2+-release from mitochondria. Our data provide an alternate interpretation of the potent protective function of GTPs on cell against apoptosis.
文摘在大鼠肝细胞培养液中加入不同浓度乐果,染毒12、24 h后,检测肝细胞凋亡率、细胞内Ca^2＋浓度、活性氧（ROS）及线粒体膜电位（Δψm）变化,并观察凋亡细胞。结果表明：染毒后肝细胞出现了凋亡变化;细胞凋亡率明显升高,除3μmol.L^-1组外,其余各处理组与对照组相比差异显著,且呈时间-剂量效应;3μmol.L^-1组细胞内Ca^2＋浓度极显著高于对照组,之后随染毒剂量的增加,细胞内Ca^2＋浓度逐渐下降;ROS水平为3-100μmol.L^-1时随染毒剂量的增大和染毒时间的延长而升高,而300μmol.L^-1组略有下降,除3μmol.L^-1组外,其余各处理组与对照组相比差异均极显著;Δψm除24 h 300μmol.L^-1组外其余各处理组均持续下降。表明低剂量乐果可诱导肝细胞凋亡,细胞内Ca^2＋、ROS和Δψm也可能参与这一过程。
