目的观察一氧化氮合酶抑制剂[L-NG-硝基精氨酸甲酯(L-NG-n itroargin ine m ethylester,L-NAME)]和钙蛋白酶抑制剂[leupeptin]对庆大霉素(gentam ic in,GM)所致耳蜗毛细胞损伤的协同防护作用。方法将20只出生后3~5天的W istar大鼠(40耳...目的观察一氧化氮合酶抑制剂[L-NG-硝基精氨酸甲酯(L-NG-n itroargin ine m ethylester,L-NAME)]和钙蛋白酶抑制剂[leupeptin]对庆大霉素(gentam ic in,GM)所致耳蜗毛细胞损伤的协同防护作用。方法将20只出生后3~5天的W istar大鼠(40耳)平均分成5组,1组为正常对照,其余4组在施加GM的同时单独或联合应用不同的保护因素(L-NAME和leupeptin)。通过耳蜗器官离体培养,对基底膜铺片行TR ITC-Phalloid in荧光染色,观察各组耳蜗毛细胞的生长情况并比较存活率。结果GM组毛细胞存活极少,L-NAME和leupeptin单独应用时毛细胞存活率明显高于GM组(P<0.01),二者联合应用时耳蜗毛细胞存活率显著高于L-NAME和leupeptin单独用药组(P<0.01)。结论L-NAME和leupeptin对庆大霉素耳毒性所致毛细胞损伤具有较好的协同防护作用。展开更多
Objective.To study the change of taurine transport,and taurine transporter(TAUT)and cysteine sulfinate decarboxylase(CSD)mRNA contents in hypertension and hypertensive cardiomegaly.Methods.Taurine content was determin...Objective.To study the change of taurine transport,and taurine transporter(TAUT)and cysteine sulfinate decarboxylase(CSD)mRNA contents in hypertension and hypertensive cardiomegaly.Methods.Taurine content was determined with a amino acid analyser.Taurine uptakes were deter-mined by( 3 H)-taurine incubation.The content of TAUT and CSD mRNA levels were measured by com-petitive quantitative RT-PCR in myocardial and vascular tissues of L-N ω -nitro-arginine(L-NNA)-in-duced hypertensive rats.Results.After the treatment of rats with L-NNA for28days,myocardial and vascular taurine con-tents decreased by11%and15%(P<0.05),respectively,and plasma taurine level increased by13%(P<0.05).Myocardial and vascular Vmax of taurine uptake reduced by30%and19%(P<0.05),respec-tively.Their Km of taurine uptake increased by36%and17%(P<0.05).Myocardial and vascular TAUT mRNA content decreased by22%and19%(P<0.05),respectively,but CSD mRNA content increased by22%(P<0.05)and30%(P<0.01),respectively.Conclusions.This study suggests that there is a decreased taurine content in myocardial and vascu-lar tissues of L-NNA-induced hypertension rats.The decreased taurine content may result from the de-creased number of TAUT on the cell membrane mainly due to the down-regulation of TAUT gene and TAUT affinity caused by hypertension and hypertensive cardiomegaly.展开更多
文摘目的观察一氧化氮合酶抑制剂[L-NG-硝基精氨酸甲酯(L-NG-n itroargin ine m ethylester,L-NAME)]和钙蛋白酶抑制剂[leupeptin]对庆大霉素(gentam ic in,GM)所致耳蜗毛细胞损伤的协同防护作用。方法将20只出生后3~5天的W istar大鼠(40耳)平均分成5组,1组为正常对照,其余4组在施加GM的同时单独或联合应用不同的保护因素(L-NAME和leupeptin)。通过耳蜗器官离体培养,对基底膜铺片行TR ITC-Phalloid in荧光染色,观察各组耳蜗毛细胞的生长情况并比较存活率。结果GM组毛细胞存活极少,L-NAME和leupeptin单独应用时毛细胞存活率明显高于GM组(P<0.01),二者联合应用时耳蜗毛细胞存活率显著高于L-NAME和leupeptin单独用药组(P<0.01)。结论L-NAME和leupeptin对庆大霉素耳毒性所致毛细胞损伤具有较好的协同防护作用。
文摘Objective.To study the change of taurine transport,and taurine transporter(TAUT)and cysteine sulfinate decarboxylase(CSD)mRNA contents in hypertension and hypertensive cardiomegaly.Methods.Taurine content was determined with a amino acid analyser.Taurine uptakes were deter-mined by( 3 H)-taurine incubation.The content of TAUT and CSD mRNA levels were measured by com-petitive quantitative RT-PCR in myocardial and vascular tissues of L-N ω -nitro-arginine(L-NNA)-in-duced hypertensive rats.Results.After the treatment of rats with L-NNA for28days,myocardial and vascular taurine con-tents decreased by11%and15%(P<0.05),respectively,and plasma taurine level increased by13%(P<0.05).Myocardial and vascular Vmax of taurine uptake reduced by30%and19%(P<0.05),respec-tively.Their Km of taurine uptake increased by36%and17%(P<0.05).Myocardial and vascular TAUT mRNA content decreased by22%and19%(P<0.05),respectively,but CSD mRNA content increased by22%(P<0.05)and30%(P<0.01),respectively.Conclusions.This study suggests that there is a decreased taurine content in myocardial and vascu-lar tissues of L-NNA-induced hypertension rats.The decreased taurine content may result from the de-creased number of TAUT on the cell membrane mainly due to the down-regulation of TAUT gene and TAUT affinity caused by hypertension and hypertensive cardiomegaly.
