基础医学与临床 ›› 2013, Vol. 33 ›› Issue (6): 699-703.

• 研究论文 • 上一篇    下一篇

ERK1/2及JNK参与DL0805抑制血管紧张素II引起的大鼠离体胸主动脉环收缩

李莉,袁天翊,杨海光,许焕丽,王乐,阎雨,杜冠华   

  1. 中国医学科学院北京协和医学院药物研究所
  • 收稿日期:2013-02-18 修回日期:2013-04-23 出版日期:2013-06-05 发布日期:2013-05-29
  • 通讯作者: 杜冠华 E-mail:dugh@imm.ac.cn
  • 基金资助:
    基于SIRT1 靶点防治支架内再狭窄先导物的发现与机制研究;基于SIRT1靶点防治PCI术后再狭窄先导物的发现与评价研究

ERK1/2 and JNK involved in the inhibitory effect of DL0805 on vasoconstriction induced by angiotensin II in the rat thoracic aortic rings

  • Received:2013-02-18 Revised:2013-04-23 Online:2013-06-05 Published:2013-05-29

摘要: 目的 研究Rho激酶抑制剂DL0805对血管紧张素Ⅱ(Ang Ⅱ)引起的大鼠离体胸主动脉环收缩反应的影响及其可能的机制。方法 测定离体血管张力观察大鼠胸主动脉环收缩反应,Western blot检测大鼠离体胸主动脉环ERK1/2和JNK蛋白磷酸化,和Ang Ⅱ 1型受体(AT1R)蛋白表达水平。结果 DL0805 (10、25和50 μmol/L)浓度依赖性地抑制Ang Ⅱ(100 nmol/L)引起的内皮完整或去内皮的大鼠离体胸主动脉环收缩(P < 0.01, P < 0.001),DL0805 (25 和 50 μmol/L)抑制Ang Ⅱ(100 nmol/L)诱导的ERK1/2和JNK的活化(P < 0.05, P < 0.01和 P < 0.001),但DL0805 (5、25和50 μmol/L)对Ang Ⅱ刺激的血管环AT1R蛋白表达水平无显著影响。结论 DL0805抑制Ang Ⅱ引起的大鼠离体胸主动脉环收缩,其机制可能与其抑制Ang Ⅱ诱导的ERK1/2和JNK活化有关。

关键词: DL0805, 血管紧张素II, 大鼠胸主动脉环, ERK1/2, JNK

Abstract: Objective To observe the effect of DL0805 (a Rho kinase inhibitor) on angiotensin II (Ang Ⅱ) -induced vascular contractions in the rat thoracic aortic rings and to investigate the possible mechanism. Methods The isometric vascular tone was measured in both endothelium-intact and endothelium-denuded rat thoracic aortic rings. Phosphorylations of p44/42 extracellular signal-regulated kinase (ERK1/2) and c-Jun amino-terminal kinase (JNK), and protein level of angiotensin type 1 receptor (AT1R) in rat aortic rings were detected by Western blot. Results DL0805 (10、25 and 50 μmol/L) inhibited Ang Ⅱ(100 nmol/L)-induced vascular contractions in both endothelium-intact and endothelium-denuded rat aortic rings in a dose dependent way (P < 0.01, P < 0.001). Furthermore, activation of ERK1/2 and JNK by Ang Ⅱ(100 nmol/L)stimulation was significantly inhibited by DL0805 (25 and 50 μmol/L) in both endothelium-intact and -denuded rat aortic rings (P < 0.05, P < 0.01 and P < 0.001). However, the protein level of AT1R in response to Ang Ⅱ was not affected by DL0805 (5、25 and 50 μmol/L) in rat aortic rings. Conclusion DL0805 inhibits Ang Ⅱ-induced rat aortic rings contraction and the mechanism involves the inhibition of Ang II-induced ERK1/2 and JNK activation.

Key words: DL0805, angiotensin II, rat thoracic aortic rings, ERK1/2, JNK

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