基础医学与临床 ›› 2016, Vol. 36 ›› Issue (8): 1040-1045.

• 研究论文 • 上一篇    下一篇

PPAR-γ激活抑制血管紧张素II诱导的大鼠心脏成纤维细胞Ets-1表达

郝广华,牛小麟,韩振华,魏瑾,高登峰,王新宏,董新   

  1. 西安交通大学第二附属医院心内科
  • 收稿日期:2016-02-02 修回日期:2016-05-04 出版日期:2016-08-05 发布日期:2016-07-13
  • 通讯作者: 牛小麟 E-mail:niuxl@mail.xjtu.edu.cn
  • 基金资助:
    RBP4对血管平滑肌细胞炎症反应、增殖及迁移的影响及机制;RBP4在动脉粥样硬化中的表达及促炎作用

PPAR-γ activation inhibits angiotensin II-induced Ets-1 expression in cardiac fibroblasts of rats

  • Received:2016-02-02 Revised:2016-05-04 Online:2016-08-05 Published:2016-07-13

摘要: 目的 研究过氧化物酶体增殖物激活受体-γ(PPAR-γ)激活对心肌纤维化的影响是否与血管紧张素II(Ang II)-Ets-1通路有关。方法 体外培养大鼠心脏成纤维细胞(CFs),分为对照组、Ang II组、Ang II+不同浓度rosiglitazone处理组、Ang II+不同PPAR-γ激动剂组、AngII+不同PPAR-γ拮抗剂组,采用实时定量RT-qPCR、Western blotting等检测Ets-1及CTGF mRNA及蛋白表达,并测定TGF-β1及 Smad2/3的表达及磷酸化水平。结果 在CFs中,Ang II诱导Ets-1 mRNA及蛋白表达(P < 0.05),上调Ets-1下游靶基因CTGF的蛋白的表达(P < 0.05),增加TGF-β1的表达以及Smad2/3的表达及磷酸化(P < 0.05)。PPAR-γ激动剂rosiglitazone,15d-PGJ2抑制Ang II诱导的Ets-1 mRNA及蛋白的表达(P < 0.05),下调Ang II 诱导的CTGF蛋白表达(P < 0.05),部分阻断Ang II诱导的TGF-β1的表达、Smad2/3的表达及磷酸化(P < 0.05)。PPAR-γ拮抗剂GW9662及BADGE均可阻断rosiglitazone对Ets-1及CTGF表达的抑制作用(P < 0.05)。结论 PPAR-γ激活主要通过TGF-β1/Smad2/3通路介导抑制Ang II诱导的大鼠CFs转录因子Ets-1的过表达。

关键词: PPAR-γ, 血管紧张素II, 纤维化, Ets-1, CTGF

Abstract: Objective To investigate whether peroxisome proliferator-activated receptor-γ (PPAR-γ) activation inhibits cardiac fibrosis through the angiotensin II (Ang II)-Ets-1 pathway. Methods Primary cultured cardiac fibroblasts (CFs) of rats were divided into these groups: control, Ang II, Ang II+ rosiglitazone, Ang II+ other PPAR-γ ligands, Ang II+ PPAR-γ antagonists. The change in expression of Ets-1, connective tissue growth factor (CTGF), transforming growth factor (TGF)-β1 and Smad2/3 were assessed by using real-time RT-PCR and western blotting. Results In growth-arrested CFs, Ang II induced the expression of Ets-1 mRNA and protein(P < 0.05), up-regulated expression of Ets-1 down stream target CTGF (P < 0.05), enhanced the expression of TGF-β1 and the expression and phosphorylation of Smad2/3 (P < 0.05). PPAR-γ ligands rosiglitazone and 15d-PGJ2 attenuated the expression of Ang II-induced Ets-1 mRNA and protein (P < 0.05), decreased the induction of CTGF by Ang II (P < 0.05), inhibited in part the expression of TGF-β1 and the expression and phosphorylation of Smad2/3 induced by Ang II (P < 0.05). These suppressive effects on Ets-1 and CTGF were attenuated by PPAR-γ antagonists GW9662 and BADGE (P < 0.05). Conclusions Activation of PPAR-γ inhibits Ang II-induced Ets-1 expression via the TGF-β1/Smad2/3 signaling pathway.

Key words: PPAR-γ, angiotensin II, fibrosis, Ets-1, CTGF

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