Objective:To explore the effect of oleuropein on sepsis-induced acute lung injury(ALI)in vitro and in vivo and investigate the underlying mechanism.Methods:In an lipopolysaccharide(LPS)-mediated cell model of sepsis-i...Objective:To explore the effect of oleuropein on sepsis-induced acute lung injury(ALI)in vitro and in vivo and investigate the underlying mechanism.Methods:In an lipopolysaccharide(LPS)-mediated cell model of sepsis-induced ALI and a cecal ligation and puncture-induced mouse model of septic ALI,CCK-8 assay and flow cytometry analysis were used to detect cell activity and apoptosis.ELISA and relevant assay kits were used to measure the levels of inflammatory cytokines and oxidative stress,respectively.Western blot was applied to determine the expression of apoptosis-and AMP-activated protein kinase(AMPK)/nuclear factor erythroid 2-related factor-2(Nrf-2)/heme oxygenase-1(HO-1)signaling-associated proteins.JC-1 staining,adenosine triphosphate(ATP)assay kit,and MitoSOX Red assays were performed to detect mitochondrial membrane potential,ATP content,and mitochondrial ROS formation,respectively.Moreover,lung injury was evaluated by measuring lung morphological alternations,lung wet-to-dry ratio,myeloperoxidase content,and total protein concentration.Results:Oleuropein reduced inflammatory reaction,oxidative damage,and apoptosis,and ameliorated mitochondrial dysfunction in LPS-exposed BEAS-2B cells and mice with septic ALI.Besides,oleuropein activated the AMPK/Nrf-2/HO-1 signaling pathway.However,these effects of oleuropein were abrogated by an AMPK inhibitor compound C.Conclusions:Oleuropein can protect against sepsis-induced ALI in vitro and in vivo by activating the AMPK/Nrf-2/HO-1 signaling,which might be a potential therapeutic agent for the treatment of sepsis-induced ALI.展开更多
目的:研究活化蛋白C(Activated protein C,APC)对大鼠皮瓣缺血再灌注损伤的作用及可能机制。方法:将80只SD雄性大鼠随机分为四组:对照组、药物对照组、模型组和治疗组,每组20只。观察术后72 h内模型大鼠皮瓣形态变化,HE染色观察大鼠皮...目的:研究活化蛋白C(Activated protein C,APC)对大鼠皮瓣缺血再灌注损伤的作用及可能机制。方法:将80只SD雄性大鼠随机分为四组:对照组、药物对照组、模型组和治疗组,每组20只。观察术后72 h内模型大鼠皮瓣形态变化,HE染色观察大鼠皮瓣组织病理学变化,TUNEL法染色观察皮瓣组织细胞凋亡,ELISA法检测血清中TNF-α、IL-6水平,用黄嘌呤氧化酶法和硫代巴比妥酸TBA比色法分别测定皮瓣组织中超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量,Westernblot法检测皮瓣组织中Nrf-2、HO-1、γ-GCS蛋白表达水平。结果:与模型组比较,治疗组皮瓣红肿、坏死程度、病理损伤程度减弱;TUNEL法染色观察,与模型组比较,治疗组皮瓣组织细胞凋亡率减少(P<0.05);ELISA法检测发现,与模型组比较,治疗组血清中TNF-α、IL-6降低(P<0.05);与模型组比较,治疗组SOD活性升高(P<0.05),MDA含量降低(P<0.05);Westernblot法检测发现,与模型组比较,治疗组Nrf-2、HO-1、γ-GCS蛋白相对表达水平上升(P<0.05)。结论:APC能改善大鼠皮瓣缺血再灌注损伤,其机制可能与激活Nrf-2/HO-1信号通路,抑制氧化应激反应和减少细胞凋亡、炎症反应有关。展开更多
目的探索姜黄素对肝癌HepG2细胞增殖及Keap1、Nrf-2表达的影响。方法姜黄素(10μmol/L、20μmol/L、40μmol/L)处理HepG2细胞,采用MTT法检测细胞增殖活力,Real-time PCR法检测Keap1 m RNA的表达,Western blotting法检测Keap1及Nrf-2蛋...目的探索姜黄素对肝癌HepG2细胞增殖及Keap1、Nrf-2表达的影响。方法姜黄素(10μmol/L、20μmol/L、40μmol/L)处理HepG2细胞,采用MTT法检测细胞增殖活力,Real-time PCR法检测Keap1 m RNA的表达,Western blotting法检测Keap1及Nrf-2蛋白的表达,荧光酶标仪检测细胞内活性氧(ROS)的变化。结果姜黄素可抑制HepG2细胞的增殖活性,中剂量组与低剂量组相比具有显著性差异(P<0.05),高剂量组与中剂量组之间差异不明显(P>0.05);姜黄素可促进Keap1 m RNA及蛋白的表达,表达量随着药物浓度上升呈升高趋势(P<0.05);姜黄素可抑制Nrf-2蛋白表达,且随着药物浓度的增加Nrf-2蛋白表达量降低(P<0.05);随着姜黄素浓度增加,HepG2细胞内ROS生成量升高(P<0.05)。结论姜黄素可以抑制HepG2细胞的增殖,其机制可能与促进Keap1表达,从而抑制Nrf-2核转位,致Nrf-2抗氧化功能弱化,ROS生成增加,促进了细胞凋亡有关。展开更多
基金supported by Wenzhou Scientific Research Project(Y20210290).
文摘Objective:To explore the effect of oleuropein on sepsis-induced acute lung injury(ALI)in vitro and in vivo and investigate the underlying mechanism.Methods:In an lipopolysaccharide(LPS)-mediated cell model of sepsis-induced ALI and a cecal ligation and puncture-induced mouse model of septic ALI,CCK-8 assay and flow cytometry analysis were used to detect cell activity and apoptosis.ELISA and relevant assay kits were used to measure the levels of inflammatory cytokines and oxidative stress,respectively.Western blot was applied to determine the expression of apoptosis-and AMP-activated protein kinase(AMPK)/nuclear factor erythroid 2-related factor-2(Nrf-2)/heme oxygenase-1(HO-1)signaling-associated proteins.JC-1 staining,adenosine triphosphate(ATP)assay kit,and MitoSOX Red assays were performed to detect mitochondrial membrane potential,ATP content,and mitochondrial ROS formation,respectively.Moreover,lung injury was evaluated by measuring lung morphological alternations,lung wet-to-dry ratio,myeloperoxidase content,and total protein concentration.Results:Oleuropein reduced inflammatory reaction,oxidative damage,and apoptosis,and ameliorated mitochondrial dysfunction in LPS-exposed BEAS-2B cells and mice with septic ALI.Besides,oleuropein activated the AMPK/Nrf-2/HO-1 signaling pathway.However,these effects of oleuropein were abrogated by an AMPK inhibitor compound C.Conclusions:Oleuropein can protect against sepsis-induced ALI in vitro and in vivo by activating the AMPK/Nrf-2/HO-1 signaling,which might be a potential therapeutic agent for the treatment of sepsis-induced ALI.
文摘目的:研究活化蛋白C(Activated protein C,APC)对大鼠皮瓣缺血再灌注损伤的作用及可能机制。方法:将80只SD雄性大鼠随机分为四组:对照组、药物对照组、模型组和治疗组,每组20只。观察术后72 h内模型大鼠皮瓣形态变化,HE染色观察大鼠皮瓣组织病理学变化,TUNEL法染色观察皮瓣组织细胞凋亡,ELISA法检测血清中TNF-α、IL-6水平,用黄嘌呤氧化酶法和硫代巴比妥酸TBA比色法分别测定皮瓣组织中超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量,Westernblot法检测皮瓣组织中Nrf-2、HO-1、γ-GCS蛋白表达水平。结果:与模型组比较,治疗组皮瓣红肿、坏死程度、病理损伤程度减弱;TUNEL法染色观察,与模型组比较,治疗组皮瓣组织细胞凋亡率减少(P<0.05);ELISA法检测发现,与模型组比较,治疗组血清中TNF-α、IL-6降低(P<0.05);与模型组比较,治疗组SOD活性升高(P<0.05),MDA含量降低(P<0.05);Westernblot法检测发现,与模型组比较,治疗组Nrf-2、HO-1、γ-GCS蛋白相对表达水平上升(P<0.05)。结论:APC能改善大鼠皮瓣缺血再灌注损伤,其机制可能与激活Nrf-2/HO-1信号通路,抑制氧化应激反应和减少细胞凋亡、炎症反应有关。
文摘目的探索姜黄素对肝癌HepG2细胞增殖及Keap1、Nrf-2表达的影响。方法姜黄素(10μmol/L、20μmol/L、40μmol/L)处理HepG2细胞,采用MTT法检测细胞增殖活力,Real-time PCR法检测Keap1 m RNA的表达,Western blotting法检测Keap1及Nrf-2蛋白的表达,荧光酶标仪检测细胞内活性氧(ROS)的变化。结果姜黄素可抑制HepG2细胞的增殖活性,中剂量组与低剂量组相比具有显著性差异(P<0.05),高剂量组与中剂量组之间差异不明显(P>0.05);姜黄素可促进Keap1 m RNA及蛋白的表达,表达量随着药物浓度上升呈升高趋势(P<0.05);姜黄素可抑制Nrf-2蛋白表达,且随着药物浓度的增加Nrf-2蛋白表达量降低(P<0.05);随着姜黄素浓度增加,HepG2细胞内ROS生成量升高(P<0.05)。结论姜黄素可以抑制HepG2细胞的增殖,其机制可能与促进Keap1表达,从而抑制Nrf-2核转位,致Nrf-2抗氧化功能弱化,ROS生成增加,促进了细胞凋亡有关。
