Aquaporin-1 expression and angiogenesis in rabbit chronic myocardial ischemia is decreased by acetazolamide

• Published in: Heart and vessels Vol. 25; no. 3; pp. 237 - 247
• Main Authors: Ran, Xun, Wang, Haoyu, Chen, Yucheng, Zeng, Zhi, Zhou, Qin, Zheng, Rong, Sun, Jiayang, Wang, Bing, Lv, Xiaoyan, Liang, Yujia, Zhang, Ke, Liu, Weiqiang
• Format: Journal Article
• Language: English
• Published: Japan Springer Japan 01.05.2010; Springer Nature B.V
• Subjects: Acetazolamide - pharmacology; Angiogenesis; Animals; Aquaporin 1 - drug effects; Aquaporin 1 - genetics; Aquaporin 1 - metabolism; Biomedical Engineering and Bioengineering; Capillaries - drug effects; Capillaries - physiopathology; Carbonic Anhydrase Inhibitors - pharmacology; Cardiac Surgery; Cardiology; Chronic Disease; Disease Models, Animal; Down-Regulation; Drug therapy; Glycoproteins; Heart; Immunohistochemistry; Ischemia; Male; Medicine; Medicine & Public Health; Myocardial Infarction - genetics; Myocardial Infarction - metabolism; Myocardial Infarction - pathology; Myocardial Infarction - physiopathology; Myocardial Ischemia - genetics; Myocardial Ischemia - metabolism; Myocardial Ischemia - pathology; Myocardial Ischemia - physiopathology; Myocardium - metabolism; Myocardium - pathology; Neovascularization, Physiologic - drug effects; Original Article; Rabbits; Reverse Transcriptase Polymerase Chain Reaction; RNA, Messenger - metabolism; Time Factors; Vascular endothelial growth factor; Vascular Endothelial Growth Factor A - metabolism; Vascular Surgery; Aquaporin-1; Myocardial infarction; Acetazolamide; Angiogenesis; Vascular endothelial growth factor
• ISSN: 0910-8327; 1615-2573
• DOI: 10.1007/s00380-009-1179-5

Aquaporin-1 (AQP1) is a water channel protein expressed in endothelial and epithelial cells of many tissues, including the vasculature, where it serves to increase water permeability of the cell membrane. Prior studies have also reported that AQP1 plays a central role in tumor angiogenesis by promoting endothelial cell migration. To investigate whether AQP1 might also influence vascular angiogenesis in ischemic myocardium, the expression level of AQP1 for 21 days post myocardial infarction in rabbit hearts was observed. Aquaporin-1 mRNA and protein levels in day 3, and peaked on day 7 post surgery. This correlated well with the pattern of neovascularization and increased water content of infarct border tissue, and suggested that AQP1 may be involved in myocardial angiogenesis in response to ischemia injury. These AQP1-induced changes were tempered by acetazolamide, a carbonic anhydrase inhibitor, which acted by downregulating AQP1 expression. Acetazolamide treatment did not significantly affect the expression of vascular endothelial growth factor in the tissues studied. Our findings indicate a novel role for AQP1 in postnatal angiogenesis, which has implications in diverse pathophysiological conditions including wound healing, tumor metastasis, and organ regeneration.