ISSN 0371-0874, CN 31-1352/Q

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G蛋白、蛋白激酶C和Na~+-H~+交换在内皮素-1诱导培养心肌细胞肥大反应中的作用

吴滨, 王庭槐, 潘敬运, 朱小南, 詹澄扬

中山医科大学生理教研室

摘要

内皮系-1(ET-1)是一种强的生长因子,并诱导心肌细胞肥大反应。在本实验中,我们探讨了G蛋白、蛋白激酶C(PKC)和Na+-H+交换在ET-1诱导的培养新生大鼠心肌细胞肥大反应中的作用。ET-1(10-10~10-7mol/L)促进3H-亮氨酸掺入,增加细胞蛋白质的含量和心肌细胞的表面积,且呈剂量依赖性,它们的EC50分别为5.2×10-10,5.2×10-10和7.3×10-10mol/L。用蛋白激酶C(PKC)抑制剂,Staurosporin(2nmol/L)预处理心肌细胞,可完全阻断ET-1诱导的心肌细胞的这些肥大反应,而蛋白激酶C激动剂,佛波酸酯(PMA)(10-8~10-6mol/L)呈剂量依赖性促进心肌细胞的肥大反应。用Na+-H+交换抑制剂,氨氯毗咪(10-4mol/L)预处理心肌细胞,可抑制ET-1诱导的心肌细胞肥大反应,但不影响PMA诱导的心肌细胞肥大反应。百日咳毒素(150ng/ml)预处理心肌细胞,可明显抑制ET-1诱导的心肌细胞肥大反应。这些结果提示,ET-1诱导的培养新生大鼠心肌细胞肥大反应是与百日咳毒素敏感的G蛋白相耦联,蛋白激酶C和Na+.H+交换可能在ET-1诱导的心肌细胞肥大反应中是重要的细胞内信使转导途径。

关键词: 内皮素-1; 蛋白激酶C; Na+-H+交换; G蛋白; 心肌细胞; 肥大反应

MA Yong-Jie

2College of Information Engineering, Taishan Medical University, Taian 271016, China

Abstract

Endothelin-1(ET-1)has been shown to be a potent growth factor and to induce cardiac hypertrophy.In the present study,we examined the role of G protein,protein kinase C(PKC)and Na+ -H+ exchanger in ET-1-induced cardiac hypertrophy in cultured neonatal rat cardiac myocytes.ET-1(1O-10~10-7 mol/L)induced promotion of 3H leucine incorporation,increase in cell protein contnt and cell surface area in a dose dependent manner with EC50 value of 5.2×1O-10,5.2×1O-10 and7.3×10-10 mol/L respectively.All of these ET-1-induced cardiomyocyte hypertrocphic responses were completely blocked by pretreatment with staurosporine(2 nmol/L),a protein kinase C inhibitor,and stimulated by 4-phorbol,12-myristate,13-acetate(PMA)(10-8~1O-6 mol/L),a protein kinase C artivator,in a dose-dependent manner.Pretreatment of amiloride(10-4 mol/L),a Na+ -H+ exchang inhibitor completely inhibited the ET-1 induced,but not PMA-induced cardiomyocyte hypertrophic responses.

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引用本文:

吴滨, 王庭槐, 潘敬运, 朱小南, 詹澄扬. G蛋白、蛋白激酶C和Na~+-H~+交换在内皮素-1诱导培养心肌细胞肥大反应中的作用 [J]. 生理学报 1998; 50 (1): .

MA Yong-Jie. . Acta Physiol Sin 1998; 50 (1): (in Chinese with English abstract).