Antioxidant effect of captopril and enalapril on reactive oxygen species-induced endothelial dysfunction in the rabbit abdominal aortaopen access
- Authors
- Kim, J.H.; Kim, H.; Kim, Y.H.; Chung, W.-S.; Suh, J.K.; Kim, S.J.
- Issue Date
- 2013
- Publisher
- Korean Society for Thoracic and Cardiovascular Surgery
- Keywords
- Angiotensin-converting enzyme inhibitors; Captopril; Enalapril; Reactive oxygen species; Vasodilation
- Citation
- Korean Journal of Thoracic and Cardiovascular Surgery, v.46, no.1, pp.14 - 21
- Indexed
- SCOPUS
KCI
- Journal Title
- Korean Journal of Thoracic and Cardiovascular Surgery
- Volume
- 46
- Number
- 1
- Start Page
- 14
- End Page
- 21
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/163809
- DOI
- 10.5090/kjtcs.2013.46.1.14
- ISSN
- 2233-601X
- Abstract
- Background: Reactive oxygen species (ROS) are known to be related to cardiovascular diseases. Many studies have demonstrated that angiotensin-converting enzyme inhibitors have beneficial effects against ROS. We investigated the antioxidant effect of captopril and enalapril in nitric oxide mediated vascular endothelium-dependent relaxations. Materials and Methods: Isolated rabbit abdominal aorta ring segments were exposed to ROS by electrolysis of the organ bath medium (Krebs-Henseleit solution) after pretreatment with various concentrations (range, 10⁻⁵ to 3*10⁻⁴ M) of captopril and enalapril. Before and after electrolysis, the endothelial function was measured by preconstricting the vessels with norepinephrine (10⁻⁶ M) followed by the cumulative addition of acetylcholine (range, 3*10⁻⁸ to 10⁻⁶ M). The relevance of the superoxide anion and hydrogen peroxide scavenging effect of captopril and enalapril was investigated using additional pretreatments of diethyldithiocarbamate (DETCA, 0.5 mM), an inhibitor of Cu/Zn superoxide dismutase, and 3-amino-1,2,4-triazole (3AT, 50 mM), an inhibitor of catalase. Results: Both captopril and enalapril preserved vascular endothelium-dependent relaxation after exposure to ROS in a dose-dependent manner (p<0.0001). Pretreatment with DETCA attenuated the antioxidant effect of captopril and enalapril (p<0.0001), but pretreatment with 3AT did not have an effect. Conclusion: Both captopril and enalapril protect endothelium against ROS in a dose-dependent fashion in isolated rabbit abdominal aortas. This protective effect is related to superoxide anion scavenging.
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