目的观察单胺氧化酶A(monoamine oxidase A,MAO-A)对与3T3-L1脂肪细胞共培养的原代新生大鼠心肌细胞(neonatal rat cardiomyocyte,NRCM)脂质沉积的影响及机制。方法选取40只出生1~3天的SD大鼠心肌细胞与3T3-L1脂肪细胞构建NRCM/3T3-L1...目的观察单胺氧化酶A(monoamine oxidase A,MAO-A)对与3T3-L1脂肪细胞共培养的原代新生大鼠心肌细胞(neonatal rat cardiomyocyte,NRCM)脂质沉积的影响及机制。方法选取40只出生1~3天的SD大鼠心肌细胞与3T3-L1脂肪细胞构建NRCM/3T3-L1共培养体系,并加入棕榈酸(palmitic acid,PA),模拟肥胖时心肌细胞所处的内环境。将细胞分为对照组、PA组、去甲肾上腺素(norepinephrine,NE)组、过氧化氢(hydrogen peroxide,H 2O 2)组、NE+CLG组、氯吉兰(clorgyline,CLG)组。采用α横纹肌肌动蛋白评估心肌细胞的纯度和面积,实时荧光定量聚合酶链反应(real-time quantitative polymerase chain reaction,RT-qPCR)测定心肌细胞内心房利钠肽(atrial natriuretic peptide,ANP)的mRNA水平,免疫荧光染色测定心肌细胞内活性氧簇水平(reactive oxygen species,ROS),油红O染色评估心肌细胞内脂质沉积,Western blot法测定心肌细胞内MAO-A、JNK的蛋白及磷酸化水平。结果与对照组比较,PA组心肌细胞面积(14.681±0.481μm^(2) vs 19.932±0.220μm^(2),P<0.01)增大,ANP的相对mRNA水平(1.006±0.017 vs 1.914±0.152,P<0.01)、MAO-A的相对蛋白水平(0.117±0.022 vs 0.430±0.092,P<0.01)、ROS水平(0.001±0.001 vs 0.004±0.002,P<0.01)、脂滴面积比(0.001±0.001 vs 0.054±0.002,P<0.01)及p-JNK的相对蛋白水平(0.032±0.007 vs 0.263±0.119,P<0.05)均增加。与PA组比较,NE明显增加心肌细胞内MAO-A的相对蛋白水平(0.430±0.092 vs 1.114±0.091,P<0.01)和ROS水平(0.004±0.002 vs 0.013±0.001,P<0.01)。另外,NE和H 2O 2均能增加心肌细胞脂滴面积比(0.054±0.002 vs 0.106±0.005,P<0.05;0.054±0.002 vs 0.092±0.002,P<0.01)和p-JNK的相对蛋白水平(0.263±0.119 vs 0.969±0.082,P<0.05;0.263±0.119 vs 0.640±0.101,P<0.05)。CLG可明显改善NE诱导的异常。结论MAO-A相对蛋白水平增加会加重与3T3-L1脂肪细胞共培养的心肌细胞内的氧化应激和脂质沉积,其机制可能与ROS/JNK信号级联反应激活有关。展开更多
Isatin was a potent endogenous monoamine oxidase (MAO) inhibitor that is more active against MAO-B than MAO-A. The acute effects of isatin on apomorphine (APO)-induced rotations were evaluated in Parkinsonian rats ind...Isatin was a potent endogenous monoamine oxidase (MAO) inhibitor that is more active against MAO-B than MAO-A. The acute effects of isatin on apomorphine (APO)-induced rotations were evaluated in Parkinsonian rats induced by 6-hydroxydopamine (6-OHDA) lesion. Furthermore, the effects of isatin on DA release in caudate putamen (CPu) of model and normal rats were monitored using fast cyclic vohammetry (FCV).展开更多
文摘目的观察单胺氧化酶A(monoamine oxidase A,MAO-A)对与3T3-L1脂肪细胞共培养的原代新生大鼠心肌细胞(neonatal rat cardiomyocyte,NRCM)脂质沉积的影响及机制。方法选取40只出生1~3天的SD大鼠心肌细胞与3T3-L1脂肪细胞构建NRCM/3T3-L1共培养体系,并加入棕榈酸(palmitic acid,PA),模拟肥胖时心肌细胞所处的内环境。将细胞分为对照组、PA组、去甲肾上腺素(norepinephrine,NE)组、过氧化氢(hydrogen peroxide,H 2O 2)组、NE+CLG组、氯吉兰(clorgyline,CLG)组。采用α横纹肌肌动蛋白评估心肌细胞的纯度和面积,实时荧光定量聚合酶链反应(real-time quantitative polymerase chain reaction,RT-qPCR)测定心肌细胞内心房利钠肽(atrial natriuretic peptide,ANP)的mRNA水平,免疫荧光染色测定心肌细胞内活性氧簇水平(reactive oxygen species,ROS),油红O染色评估心肌细胞内脂质沉积,Western blot法测定心肌细胞内MAO-A、JNK的蛋白及磷酸化水平。结果与对照组比较,PA组心肌细胞面积(14.681±0.481μm^(2) vs 19.932±0.220μm^(2),P<0.01)增大,ANP的相对mRNA水平(1.006±0.017 vs 1.914±0.152,P<0.01)、MAO-A的相对蛋白水平(0.117±0.022 vs 0.430±0.092,P<0.01)、ROS水平(0.001±0.001 vs 0.004±0.002,P<0.01)、脂滴面积比(0.001±0.001 vs 0.054±0.002,P<0.01)及p-JNK的相对蛋白水平(0.032±0.007 vs 0.263±0.119,P<0.05)均增加。与PA组比较,NE明显增加心肌细胞内MAO-A的相对蛋白水平(0.430±0.092 vs 1.114±0.091,P<0.01)和ROS水平(0.004±0.002 vs 0.013±0.001,P<0.01)。另外,NE和H 2O 2均能增加心肌细胞脂滴面积比(0.054±0.002 vs 0.106±0.005,P<0.05;0.054±0.002 vs 0.092±0.002,P<0.01)和p-JNK的相对蛋白水平(0.263±0.119 vs 0.969±0.082,P<0.05;0.263±0.119 vs 0.640±0.101,P<0.05)。CLG可明显改善NE诱导的异常。结论MAO-A相对蛋白水平增加会加重与3T3-L1脂肪细胞共培养的心肌细胞内的氧化应激和脂质沉积,其机制可能与ROS/JNK信号级联反应激活有关。
文摘Isatin was a potent endogenous monoamine oxidase (MAO) inhibitor that is more active against MAO-B than MAO-A. The acute effects of isatin on apomorphine (APO)-induced rotations were evaluated in Parkinsonian rats induced by 6-hydroxydopamine (6-OHDA) lesion. Furthermore, the effects of isatin on DA release in caudate putamen (CPu) of model and normal rats were monitored using fast cyclic vohammetry (FCV).