PS 07-30 AGE-ASSOCIATED CHANGES IN THE VASCULAR RENIN-ANGIOTENSIN-SYSTEM IN MICE. (September 2016)

• Record Type: Journal Article
• Authors: Yoon, Hye Eun; Kim, Eun Nim; Kim, Min Young; Lim, Ji Hee; Jang, In-Ae; Ban, Tae Hyun; Shin, Seok Joon; Park, Cheol Whee; Chang, Yoon Sik; Choi, Bum Soon
• Is Part Of: Journal of hypertension. Volume 34:(2016) Supplement 1
• Publication Date: 2016-09
• Subjects: Hypertension -- Periodicals; Hypertension -- Periodicals; 616.132005
• DOI: 10.1097/01.hjh.0000500693.13738.68
• Languages: English
• ISSNs: 1473-5598

Abstract

Abstract : Objective: This study evaluated whether the change in the renin-angiotensin system (RAS) is associated with arterial aging in mice. Design and Method: Histologic changes and expressions of transforming growth factor-β (TGF-β), collagen IV, angiotensin II (Ang II), angiotensin converting enzyme (ACE), angiotensin converting enzyme 2 (ACE2), angiotensin II type 1 receptor (AT1R), angiotensin II type 2 receptor (AT2R), prorenin receptor (PRR), Mas receptor (MasR), endothelial nitric oxide synthase (eNOS), NADPH oxidase 2 and 4 (Nox2 and Nox4), 8-hydroxy-2′-deoxyguanosine (8-OHdG), and superoxide dismutase 1 and 2 (SOD1 and SOD2), were measured in the thoracic aortas from 2-month-old, 12-month-old, and 24-month-old C57/BL6 mice. Results: Twenty-four-month-old mice showed significantly increased aortic media thickness and expressions of TGF-β and collagen IV compared to 2-month-old and 12-month-old mice. The expressions of PRR, ACE, and Ang II, and AT1R-positive area significantly increased, whereas expressions of ACE2 and MasR and AT2R-positive area decreased with age. The expressions of phosphorylated eNOS, SOD1 and SOD2 decreased, and the 8-OHdG-positive area increased with age. The expression of Nox2 significantly increased with age, but that of Nox4 did not change. Conclusions: The enhanced PRR-ACE-Ang II-AT1R axis and reduced ACE2-MasR axis were associated arterial aging in mice.