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首页> 外文期刊>Circulation journal >Elevated Expression of Connective Tissue Growth Factor in Human Atrial Fibrillation and Angiotensin II-Treated Cardiomyocytes
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Elevated Expression of Connective Tissue Growth Factor in Human Atrial Fibrillation and Angiotensin II-Treated Cardiomyocytes

机译:房颤和血管紧张素II处理的心肌细胞中结缔组织生长因子的表达升高

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Background: Atrial fibrosis is a feature of structural remodeling in atrial fibrillation (AF). Connective tissue growth factor (CTGF) is a potent profibrotic factor, but its role of CTGF in AF is not yet fully understood. Methods and Results: Right atrial appendages were obtained from 20 patients who underwent cardiac surgery (10 with sinus rhythm, 10 with AF). The mRNA level, protein level and immunohistochemical staining of CTGF were significantly increased in AF patients. In a porcine AF model, tissue angiotensin II (Ang II) and CTGF levels were significantly upregulated in both atria. In perfused rat hearts, Ang II stimulation increased CTGF expression, which could be inhibited by Ang II type I receptor antagonist. In a cell culture system, both atrial fibroblasts and myocytes were responsible for the increased CTGF expression under Ang II treatment. Ang II type I receptor antagonist could inhibit the Ang II-induced CTGF expression. Treating with recombinant CTGF, atrial fibroblasts expressed an increased level of collagen I. Furthermore, the CTGF level was highly correlated with tissue Ang II content in AF pigs. Conclusions: AF patients and animals exhibited a significantly increased expression of CTGF. Ang II stimulation upregulated CTGF expression in both atrial fibroblasts and myocytes. Ang II-induced CTGF expression might be involved in atrial substrate remodeling. ( Circ J 2011; 75: 1592-1600)
机译:背景:心房纤维化是房颤(AF)结构重塑的特征。结缔组织生长因子(CTGF)是有效的纤维化因子,但尚未完全了解其在AF中的作用。方法和结果:20例接受心脏手术的患者获得了右心耳(其中窦性心律10例,房颤10例)。 AF患者CTGF的mRNA水平,蛋白水平和免疫组化染色均明显升高。在猪房颤模型中,两个心房的组织血管紧张素II(Ang II)和CTGF水平均显着上调。在灌注的大鼠心脏中,Ang II刺激增加了CTGF的表达,这可以被Ang II I型受体拮抗剂抑制。在细胞培养系统中,在Ang II处理下,心房成纤维细胞和心肌细胞均是CTGF表达增加的原因。 Ang II I型受体拮抗剂可以抑制Ang II诱导的CTGF表达。用重组CTGF处理,心房成纤维细胞表达的胶原蛋白I水平升高。此外,CTGF水平与AF猪的组织Ang II含量高度相关。结论:AF患者和动物表现出CTGF表达的显着增加。 Ang II刺激上调了心房成纤维细胞和心肌细胞中CTGF的表达。 Ang II诱导的CTGF表达可能与心房底物重塑有关。 (Circ J 2011; 75:1592-1600)

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