γ-谷氨酰半胱氨酸合成酶（γ-GCS）是谷胱甘肽（GSH）合成的限速酶，其表达水平与活性对支气管哮喘（哮喘）有重要意义，核因子相关因子2（NF-E2 related factor2，Nrf2）能调控γ-GCS的表达。细胞外信号通过细胞内Keapl、Bachl、PERK...γ-谷氨酰半胱氨酸合成酶（γ-GCS）是谷胱甘肽（GSH）合成的限速酶，其表达水平与活性对支气管哮喘（哮喘）有重要意义，核因子相关因子2（NF-E2 related factor2，Nrf2）能调控γ-GCS的表达。细胞外信号通过细胞内Keapl、Bachl、PERK等多种因素调节Nrf2的活性，而导致γ-GCS的活性改变，最终使得GSH含量改变，而参与哮喘发病过程。展开更多
目的探讨以si RNA为载体沉默骨髓间充质干细胞(MSC)中核因子E2相关因子2(Nrf2)基因后细胞移植对大鼠心肌梗死后心肌纤维化和心室重构的影响及可能机制。方法建立心肌梗死大鼠模型,随机分为沉默Nrf2基因的MSC移植组(MSCNrf2-/-组)、过表...目的探讨以si RNA为载体沉默骨髓间充质干细胞(MSC)中核因子E2相关因子2(Nrf2)基因后细胞移植对大鼠心肌梗死后心肌纤维化和心室重构的影响及可能机制。方法建立心肌梗死大鼠模型,随机分为沉默Nrf2基因的MSC移植组(MSCNrf2-/-组)、过表达Nrf2基因的MSC移植组(MSCNrf2+/+组)和生理盐水转染MSC移植组(对照组),每组12只。细胞移植后28天,采用Masson染色检测心肌梗死边缘区胶原沉积含量和纤维化程度,Western blot检测梗死心肌Nrf2和血红素氧合酶1(HO-1)蛋白表达水平,超声心动图评价梗死后心功能。结果 si RNA-Nrf2转染MSC后,Nrf2蛋白表达明显减少。移植后第28天,MSCNrf2-/-组心肌组织纤维化程度较对照组加重,MSCNrf2+/+组心肌组织纤维化程度较对照组减轻(P<0.05);MSCNrf2-/-组梗死心肌中Nrf2、HO-1蛋白表达较对照组下降(P<0.05),而MSCNrf2+/+组梗死心肌中Nrf2、HO-1蛋白表达较对照组增加(P<0.05);超声心动图结果显示,与对照组比较,MSCNrf2-/-组左心室舒张期末内经(LVEDD)和左心室收缩期末内经(LVESD)增大,左心室射血分数(LVEF)下降(P<0.05),MSCNrf2+/+组LVEDD和LVESD均减小,LVEF无下降(P<0.05)。结论 si RNA-Nrf2可有效干扰MSC中Nrf2蛋白的表达,降低外源性MSC对梗死心脏的修复能力,增加心肌梗死区胶原沉积,进而促进心室重构,降低心功能。由此推测Nrf2信号通路在干细胞移植治疗心肌梗死后心肌重构和纤维化中起了关键作用。展开更多
Objective： To examine the effects of deltamethrin（DM） and tBHQ on the activation of Nrt2 and expression of GCS-HS in primary astrocytes. Methods： Rat primary astrocytes were treated with DM （10μmol/L） and tBHQ ...Objective： To examine the effects of deltamethrin（DM） and tBHQ on the activation of Nrt2 and expression of GCS-HS in primary astrocytes. Methods： Rat primary astrocytes were treated with DM （10μmol/L） and tBHQ （40μmol/L）, for 1 and 6 h respectively. Results： Analysis using immunofluorescent confocal microscopy revealed that tBHQ treatment led to a dramatic increase in the level of Nrt2. The ratio of cytoplasmic Nrt2 protein to nuclear Nrt2 protein was markedly reduced in astrocytes by either tBHQ or DM treatment. The level of Nrf2 was reduced by combined tBHQ with DM treatment for 1 h, but treatment the ratio of cytoplasmic Nrf2 protein to nuclear Nrf2 protein was increased compared with that of the tBHQ only. The expression of GCS-HS in astrocytes was not altered by DM or tBHQ or both in astrocytes. Conclusion： These findings demonstrated for the first time that Nrf2 was activated by pesticides and antioxidants in astrocytes, implicating a tote of Nrf2 in response to pesticide neurotoxicity ingla.展开更多
文摘γ-谷氨酰半胱氨酸合成酶（γ-GCS）是谷胱甘肽（GSH）合成的限速酶，其表达水平与活性对支气管哮喘（哮喘）有重要意义，核因子相关因子2（NF-E2 related factor2，Nrf2）能调控γ-GCS的表达。细胞外信号通过细胞内Keapl、Bachl、PERK等多种因素调节Nrf2的活性，而导致γ-GCS的活性改变，最终使得GSH含量改变，而参与哮喘发病过程。
文摘目的探讨以si RNA为载体沉默骨髓间充质干细胞(MSC)中核因子E2相关因子2(Nrf2)基因后细胞移植对大鼠心肌梗死后心肌纤维化和心室重构的影响及可能机制。方法建立心肌梗死大鼠模型,随机分为沉默Nrf2基因的MSC移植组(MSCNrf2-/-组)、过表达Nrf2基因的MSC移植组(MSCNrf2+/+组)和生理盐水转染MSC移植组(对照组),每组12只。细胞移植后28天,采用Masson染色检测心肌梗死边缘区胶原沉积含量和纤维化程度,Western blot检测梗死心肌Nrf2和血红素氧合酶1(HO-1)蛋白表达水平,超声心动图评价梗死后心功能。结果 si RNA-Nrf2转染MSC后,Nrf2蛋白表达明显减少。移植后第28天,MSCNrf2-/-组心肌组织纤维化程度较对照组加重,MSCNrf2+/+组心肌组织纤维化程度较对照组减轻(P<0.05);MSCNrf2-/-组梗死心肌中Nrf2、HO-1蛋白表达较对照组下降(P<0.05),而MSCNrf2+/+组梗死心肌中Nrf2、HO-1蛋白表达较对照组增加(P<0.05);超声心动图结果显示,与对照组比较,MSCNrf2-/-组左心室舒张期末内经(LVEDD)和左心室收缩期末内经(LVESD)增大,左心室射血分数(LVEF)下降(P<0.05),MSCNrf2+/+组LVEDD和LVESD均减小,LVEF无下降(P<0.05)。结论 si RNA-Nrf2可有效干扰MSC中Nrf2蛋白的表达,降低外源性MSC对梗死心脏的修复能力,增加心肌梗死区胶原沉积,进而促进心室重构,降低心功能。由此推测Nrf2信号通路在干细胞移植治疗心肌梗死后心肌重构和纤维化中起了关键作用。
文摘Objective： To examine the effects of deltamethrin（DM） and tBHQ on the activation of Nrt2 and expression of GCS-HS in primary astrocytes. Methods： Rat primary astrocytes were treated with DM （10μmol/L） and tBHQ （40μmol/L）, for 1 and 6 h respectively. Results： Analysis using immunofluorescent confocal microscopy revealed that tBHQ treatment led to a dramatic increase in the level of Nrt2. The ratio of cytoplasmic Nrt2 protein to nuclear Nrt2 protein was markedly reduced in astrocytes by either tBHQ or DM treatment. The level of Nrf2 was reduced by combined tBHQ with DM treatment for 1 h, but treatment the ratio of cytoplasmic Nrf2 protein to nuclear Nrf2 protein was increased compared with that of the tBHQ only. The expression of GCS-HS in astrocytes was not altered by DM or tBHQ or both in astrocytes. Conclusion： These findings demonstrated for the first time that Nrf2 was activated by pesticides and antioxidants in astrocytes, implicating a tote of Nrf2 in response to pesticide neurotoxicity ingla.
