Objective: To test the hypothesis that the inhibition of endoplasmic reticulum(ER) stress-induced apoptosis in oxidized low-density lipoproteins(ox-LDL)-induced human aortic-vascular smooth muscle cells(HA-VSMCs) was ...Objective: To test the hypothesis that the inhibition of endoplasmic reticulum(ER) stress-induced apoptosis in oxidized low-density lipoproteins(ox-LDL)-induced human aortic-vascular smooth muscle cells(HA-VSMCs) was associated with suppression of the protein kinase RNA-like ER kinase(PERK)-eukaryotic translation initiation factor 2α(e IF2α)-activating transcription factor 4(ATF4)-CCAAT/enhancer binding protein homologous protein(CHOP) signaling pathway by Pollen Typhae total flavone(PTF). Methods: Primary HA-VSMCs were cultured and identified. The cultured HA-VSMCs were randomized into 5 groups, including a normal control group, an ox-LDL group(70 μg/m L high ox-LDL), an HPTF group(70 μg/m L high ox-LDL+500 μg/m L PTF), an MPTF group(70 μg/m L high ox-LDL+250 μg/m L PTF), and a LPTF group(70 μg/m L high ox-LDL+100 μg/m L PTF) in the first part;and a normal control group, an ox-LDL group(70 μg/mL high ox-LDL), an MPTF group(70 μg/m L high ox-LDL+250 μg/m L PTF), a sh RNA group(transducted with PERK shRNA lentiviral particles), a scramble shRNA group(transducted with control shRNA lentiviral particles), an MPTF+ox-LDL+shRNA group(250 μg/mL PTF+70 μg/mL high ox-LDL+PERK shRNA lentiviral particles) and an ox-LDL+shRNA group(70 μg/mL high ox-LDL+PERK shRNA lentiviral particles) in the second part. The protein expression levels of ER-associated apoptosis proteins were detected by Western blot, and their m RNA expression levels were detected by quantitative real-time reverse transcription-polymerase chain reaction. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay was applied to test cel viability, and the level of apoptosis was monitored by flow cytometry. Results: The MTT assay and flow cytometry showed that the ox-LDL group had a significant increase in apoptosis, which was attenuated in PTF treatment groups and sh RNA groups. Moreover, the ox-LDL group had increased protein and m RNA levels of binding immunoglobulin protein and ER-associated apoptosis proteins, such as PERK,展开更多
目的:观察蒲黄总黄酮(Pollen Typhae total flavones,PTF)对棕榈酸培养下C2C12骨骼肌细胞白细胞介素6(interleukin-6,IL-6)表达的影响,探讨PTF改善骨骼肌胰岛素抵抗(insulin resistance,IR)的可能机制。方法:0.25mmol/L棕榈酸培养建立...目的:观察蒲黄总黄酮(Pollen Typhae total flavones,PTF)对棕榈酸培养下C2C12骨骼肌细胞白细胞介素6(interleukin-6,IL-6)表达的影响,探讨PTF改善骨骼肌胰岛素抵抗(insulin resistance,IR)的可能机制。方法:0.25mmol/L棕榈酸培养建立骨骼肌细胞IR模型。根据处理方法不同,设对照组、模型组、核转录因子κB(nuclear factor-kappaB,NF-κB)抑制剂PDTC组、罗格列酮(rosiglitazone,ROS)组、ROS+PDTC组、PTF组和PTF+PDTC抑制剂组。处理16h后,3H-脱氧葡萄糖摄入法观察细胞对葡萄糖的转运率,实时定量多聚酶联反应检测IL-6mRNA的表达,酶联免疫吸附测定法检测细胞培养上清中IL-6蛋白水平。结果:0.25mmol/L棕榈酸培养16h,C2C12细胞葡萄糖摄取率下降30.43%,IR模型建立;PTF可使IR模型细胞葡萄糖转运率增加32.39%,IL-6mRNA表达及细胞培养上清液中IL-6蛋白水平均显著下降,差异有统计学意义(P<0.05);加入PDTC后,细胞IL-6mRNA表达及细胞培养上清液中IL-6蛋白水平上升(P<0.05)。结论:PTF通过抑制NF-κB通路而抑制C2C12骨骼肌细胞IL-6mRNA表达及蛋白分泌,可能是其减轻骨骼肌炎症状态和改善IR的机制之一。展开更多
基金Supported by the National Natural Science Foundation of China(No.81573922)the Traditional Chinese Medicine Scientific Research Project of Guangdong Province,China(No.20151076)the Sanming Project of Medicine in Shenzhen,China(No.SZSM201612033)
文摘Objective: To test the hypothesis that the inhibition of endoplasmic reticulum(ER) stress-induced apoptosis in oxidized low-density lipoproteins(ox-LDL)-induced human aortic-vascular smooth muscle cells(HA-VSMCs) was associated with suppression of the protein kinase RNA-like ER kinase(PERK)-eukaryotic translation initiation factor 2α(e IF2α)-activating transcription factor 4(ATF4)-CCAAT/enhancer binding protein homologous protein(CHOP) signaling pathway by Pollen Typhae total flavone(PTF). Methods: Primary HA-VSMCs were cultured and identified. The cultured HA-VSMCs were randomized into 5 groups, including a normal control group, an ox-LDL group(70 μg/m L high ox-LDL), an HPTF group(70 μg/m L high ox-LDL+500 μg/m L PTF), an MPTF group(70 μg/m L high ox-LDL+250 μg/m L PTF), and a LPTF group(70 μg/m L high ox-LDL+100 μg/m L PTF) in the first part;and a normal control group, an ox-LDL group(70 μg/mL high ox-LDL), an MPTF group(70 μg/m L high ox-LDL+250 μg/m L PTF), a sh RNA group(transducted with PERK shRNA lentiviral particles), a scramble shRNA group(transducted with control shRNA lentiviral particles), an MPTF+ox-LDL+shRNA group(250 μg/mL PTF+70 μg/mL high ox-LDL+PERK shRNA lentiviral particles) and an ox-LDL+shRNA group(70 μg/mL high ox-LDL+PERK shRNA lentiviral particles) in the second part. The protein expression levels of ER-associated apoptosis proteins were detected by Western blot, and their m RNA expression levels were detected by quantitative real-time reverse transcription-polymerase chain reaction. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay was applied to test cel viability, and the level of apoptosis was monitored by flow cytometry. Results: The MTT assay and flow cytometry showed that the ox-LDL group had a significant increase in apoptosis, which was attenuated in PTF treatment groups and sh RNA groups. Moreover, the ox-LDL group had increased protein and m RNA levels of binding immunoglobulin protein and ER-associated apoptosis proteins, such as PERK,
