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中国临床药理学与治疗学 ›› 1998, Vol. 3 ›› Issue (4): 261-267.

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洛沙坦对血管紧张素Ⅱ诱导的心肌细胞c-fos表达及对细胞内游离钙升高的拮抗作用

孙旗, 冯辉, 吴俊芳1, 牛凤珍   

  1. 中国人民解放军202 医院,沈阳 110003;
    1中国医学科学院药物研究所
  • 收稿日期:1998-08-17 出版日期:1998-12-26 发布日期:2020-12-01
  • 作者简介:孙旗,男,43岁,医学博士,博士后,副主任医师,主要从事心血管疾病的研究及临床工作。

Inhibitory effects of Losartan on c-fos expression and intracellular free calcium elevation induced by Angiotensio Ⅱ in cardiomyocytes of neonatal rats

SUN Qi, FENG Hui, WU Jun-Fang, NIU Feng-Zhen   

  1. Dept of Cardiology,PLA 202 Hospital,Shenyang 110003
  • Received:1998-08-17 Online:1998-12-26 Published:2020-12-01

摘要: 目的 研究血管紧张素AT1亚型受体拮抗剂洛沙坦(losartan,LT)对血管紧张素Ⅱ(AngⅡ)诱导的心肌细胞c-f os 表达及细胞内游离钙变化的影响。方法 斑点杂交及Fura-2技术。结果 AngⅡ10nmo l/L 能诱导培养乳鼠心肌细胞c-fos的一过性高表达及[Ca2+] 的显著升高。LT 20μmol/L能显著抑制AngⅡ诱导的心肌细胞c-fos的高表达,而血管紧张素AT2亚型受体拮抗剂PD123319 则无明显作用。LT1~100μmol/L 能剂量依赖性地抑制AngⅡ引起的[Ca2+]i升高。结论 AngⅡ诱导的心肌细胞c-f os 高表达及[Ca2+]i升高可能是通过AT1亚型受体介导而实现的,LT可能是一种治疗心肌肥厚的有效药物。

关键词: 洛沙坦, 血管紧张素Ⅱ, c-fos原癌基因, Fura-2, 心肌细胞, 钙离子

Abstract: Aim To study effects of Losartan on c-fos mRNA expression and free int racellular Ca2+([ Ca2+] i)level induced by AngiotensionⅡ(AngⅡ)in cardiomyocytes of neo natalrats.Methods Effect of Losartan on c-fos mRNA ex pression induced by AngⅡin cardiomyocytes was studied with dot blotting assay.Ca2+was measured with Ca2+sensitive fluorescent indicator (Fura-2/AM) using AR-C M-M IE cation measurement system.Results AngⅡtemporally induced c-fos gene expression and significantly increased the [Ca2+] ielevation in cardiomyocytes of neonatal rat s.However,the dynamic changes of c-fosgene expression and [Ca2+] i could be inhibited by Losartan 20μmol/L,but not by PD123319.Lo sartan 1~100μmol/L significantly inhibited AngⅡinduced [Ca2+] ielevation in adose-dependent manner.Conclusion The results suggest that c-fos expression and[Ca2+] ielevation induced by AngⅡare mediated by AT1 subtype acceptor.Losartan maybe an effective drug in treating cardiac hypertrophy.

Key words: losartan, angiotension Ⅱ, c-fos proto-oncogene, Fura-2, cardiomy oocytes

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