Enhanced Expression of Angiopoietin-2 and the Tie2 Receptor but Not Angiopoietin-1 or the Tie1 Receptor in a Rat Model of Myocardial Infarction

Kou-Gi Shyu, Yao Jen Liang, Hang Chang, Bao Wei Wang, Jyh Gang Leu, Peiliang Kuan

研究成果: 雜誌貢獻文章同行評審

12 引文 斯高帕斯(Scopus)

摘要

Modulation of Tie2 receptor activity by angiopoietin ligands is crucial for angiogenesis, blood vessel maturation, and vascular endothelium integrity. The role of the angiopoietin (Ang) and Tie system in myocardial infarction is not well understood. To investigate the participation of the Ang/Tie in myocardial infarction, adult Sprague-Dawley rats with ligation of the left anterior descending coronary artery to induce myocardial infarction were studied. Ang1, Ang2, Tie1, and Tie2 were measured immediately after ligation of the coronary artery, and at 6 h, 1 and 3 days, and 1, 2, 3 and 4 weeks after ligation by Northern blotting, Western blotting, and immunohistochemical staining. Ang2 mRNA significantly increased from 2 weeks (2.1-fold) to 4 weeks (2.9-fold) after the infarction in the left ventricular free wall. Tie2 mRNA increased significantly from 1 week (2.1-fold) to 4 weeks (3.8-fold) after the infarction. Ang2 protein also significantly increased from 3 days (1.9-fold) to 4 weeks (3-fold) after the infarction in the left ventricular free wall. Tie2 protein increased 2.4-fold at 3 weeks and 2.8-fold at 4 weeks after the infarction. Neither Ang1 nor Tie1 mRNA or protein showed any significant change at any time point after the infarction. The ratio of Ang2/Ang1 mRNA and protein in the study group was higher than that in the control group. Ang2 and Tie2 expression in nonischemic myocardium showed no significant change. Immunohistochemical study also showed increased immunoreactivity of Ang2 and Tie2 at the infarct border. In conclusion, Ang2 and Tie2 expressions significantly increased both spatial and temporal patterns after myocardial infarction in the rat ventricular myocardium, while Ang1 and Tie1 receptor expression did not.
原文英語
頁(從 - 到)163-171
頁數9
期刊Journal of Biomedical Science
11
發行號2
DOIs
出版狀態已發佈 - 2004

ASJC Scopus subject areas

  • 生物化學、遺傳與分子生物學 (全部)

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