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作 者:朱肖星[1] 梅其炳[1] 刘莉[1] 吕顺艳[2] 胡玉珍[2] 张峰[1] 陈定章[3] 裴兆辉[2] 袁文俊[4]
机构地区:[1]第四军医大学药理学教研室,上海200003 [2]第四军医大学生理学教研室,上海200003 [3]第四军医大学西京医院超声科,陕西西安710032 [4]第二军医大学生理学教研室,上海200003
出 处:《心脏杂志》2005年第5期441-444,共4页Chinese Heart Journal
摘 要:目的:研究内皮素-1(ET-1)诱导心肌肥大的机制及对抗的药物。方法:在培养新生大鼠心肌细胞中,采用L-型钙通道阻滞剂拉西地平(larc id ip ine)和MN9202、钙激活氯通道阻断剂尼氟灭酸(n iflum ic ac id,NFA)、蛋白激酶C(prote in k inase C,PKC)通路的阻断剂白屈菜季氨碱(chelerythrine,che)和ERK通路阻断剂PD98059(PD)观察内皮素-1在诱导心肌蛋白质合成中的影响。结果:对照组(DMEM)蛋白质含量为273±20μg/m l,ET-1组为312±30μg/m l,较对照组升高14%。ET-1+NFA组、ET-1+che组、ET-1+MN9202组、ET-1+larc id ip ine组、ET-1+PD98059组分别为280±10μg/m l、283±10μg/m l、285±27μg/m l、275±22μg/m l、293±33μg/m l;与ET-1组比较分别降低10%、9%、8.6%、13.1%、6.1%。结论:ET-1刺激引起的心肌细胞蛋白合成与钙激活氯通道和L-型钙通道有关,PKC和ERK通路在ET-1诱导心肌肥大的信号转导通路中起重要作用。AIM: To investigate the mechanism of caMiac mvoevte hypertrophy indueed by endothelin-1 (ET-1). METHODS: ET-1 has been known to be a potent stimulator for neonatal rat ventricular myoevte (NRVM) hypertrophy in vitro . Chronic ET-1 stimulation produces increased cell size and protein synthesis . Over the past several years, cuhured NRVM have been used to delineate the signaling pathways activated by ET-1. We studied the influence of protein synthesis stinmlated bv cbronie ET-1 using the blockers of L-type calcium channel ( larcidipine and MN9202 ) , the inhibitor of calcium activated chlorine channel ( niflumic acid, NFA ) , the inhibitor of protein kinase C ( PKC ) ( ehelerythrine, ehe ) and the inhibitor of ERK( PD98059,PD). RESULTS: Intracellular protein contents in cardiac ,nvoevtes iueach groups were: ET-1, 312±30 μg/ml (14% higher than control, P〈0.05); ET-1 +NFA, 280 ± 10 μg/ml ( 10% lower titan ET-1, P 〈0.05) ; ET-1 + ehe, 283 ± 10 μg/ml(9% lower titan ET-1, P 〈0.05); ET-1 +MN9202, 285 ±27 μg/,nl (8.6% lower than ET-1, P〉0.05); ET-1 +Lareidipine, 275 ±22 μg/ml(13.1% lower than ET-1, P〈0.05) ; ET-1 +PD98059, 293 ±33 μg/ml (6. 1% lower than ET-1, P 〉0.05). CONCLUSION: ET-1 indueed growth -promoting in ,nw)evtes is associated with L-type eah'ium channels and cah'ium activate〈l chlorine channels. PKC and ERK and be iml〉ortant intracellular signaling transdueting pathways in ET-1-induced cardiac hypertrophy in cultured neonatal rat cardiac myoeytes.
关 键 词:内皮素-1 L-型钙通道 钙激活氯通道 蛋白激酶C(PKC)途径 细胞外信号调节的蛋白激酶(ERK)途径
分 类 号:R331.31[医药卫生—人体生理学]
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