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山东大学学报(医学版) ›› 2013, Vol. 51 ›› Issue (9): 22-25.

• 基础医学 • 上一篇    下一篇

心肌纤维化模型大鼠心肌组织中GRK2的表达以及对胶原合成的影响

阚丽丽1,蒋方国1,安丰双2   

  1. 1.兖矿集团有限公司总医院重症医学科, 山东 邹城  273500;
    2.山东大学齐鲁医院心内科,济南 250012
  • 收稿日期:2013-05-15 出版日期:2013-09-10 发布日期:2013-09-10
  • 通讯作者: 安丰双,E-mail:163afs@163.com

Effect and expression of GRK2 on collagen synthesis in myocardial fibrosis rat model

KAN Li-li1, JIANG Fang-guo1, AN Feng-shuang2   

  1. 1. Department of Intensive Care Unit, General Hospital of Yankuang Group Co. Ltd, Zoucheng 273500, Shandong, China;
    2. Department of Cardiology, Qilu Hospital of Shandong University, Jinan 250012, China
  • Received:2013-05-15 Online:2013-09-10 Published:2013-09-10

摘要:

目的   探讨G蛋白偶联受体激酶2(GRK2)在心肌纤维化发生过程中的作用。方法   皮下注射异丙肾上腺素诱导大鼠心肌纤维化,采用HE染色观察模型大鼠心肌组织学变化,差速贴壁法分离培养心肌成纤维细胞,检测成纤维细胞中GRK2的表达和胶原Iα含量,采用siRNA干涉法抑制GRK2表达,采用cAMP检测试剂盒检测细胞内cAMP含量。结果   HE染色显示大鼠心肌纤维化模型心肌细胞出现坏死、肥大、淋巴细胞浸润等变化。Western blotting结果显示,异丙肾上腺素诱导模型大鼠心肌成纤维细胞中GRK2表达增加(P<0.05),胶原Iα表达增加(P<0.01)。GRK2特异性siRNA可以显著抑制GRK2的表达(P<0.05)。cAMP含量分析显示,异丙肾上腺素诱导心肌纤维化模型大鼠中心肌组织cAMP含量明显下降(P<0.01),在siRNA抑制GRK2表达后,心肌组织中cAMP水平显著升高(P<0.05)。结论      采用siRNA法抑制GRK2表达可以增加细胞内cAMP的含量。GRK2有望成为心肌纤维化防治靶点。

关键词: 心肌纤维化;G蛋白偶联受体激酶2;环磷酸腺苷

Abstract:

Objective  To study the role of G protein-coupled receptor kinase 2 (GRK2) on myocardial fibrosis. Methods    Rat model of myocardial fibrosis was established by subcutaneous injection with isoproterenol. Myocardial histological changes of the rats were tested by microscope after hematoxylin and eosin staining (HE). Myocardial fibroblasts were isolated and cultured with differential anchoring velocity. The expressions of GRK2 and collagen type Iα were examined by western blotting. The cAMP level was tested after GRK2 gene was silenced by siRNA. Results   HE staining showed myocardium necrosis, hypertrophy, and lymphocytic infiltration. The expression of GRK2 (P<0.05) and collagen type Iα (P<0.05) were up-regulated in isoproterenol-induced rats. The level of cAMP decreased significantly in isoproterenol-induced rats (P<0.05). However, the level of cAMP increased after GRK2 gene silenced by siRNA (P<0.05). Conclusion    The intracellular cAMP   increased after GRK2 gene expression is silenced by siRNA. GRK2 may serve as a novel potential therapeutic target.

Key words: Myocardial fibrosis; G-protein-coupled receptor kinase 2; Cyclic adenosine monophosphate

中图分类号: 

  • R542.2
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