Lu Lu1, Li Guo2, Ting-Ting Xie3, Hai-Li Xin1. 1. The Department of Pharmaceutical Care, the General Hospital of Chinese People's Liberation Army, Beijing, China. 2. Puhuangyu Clinic, Beijing, China. Electronic address: guoli20141@hotmail.com. 3. Clinical Pharmacy Department of Pharmaceutical Care, the General Hospital of Chinese People's Liberation Army, Beijing, China.
Abstract
INTRODUCTION: The present study was designed to test the hypothesis that local angiotensin converting enzyme (ACE) was involved in the cardiac hypertrophy induced by sinoaortic denervation (SAD) in rats. METHODS: Experiment 1: Six weeks after SAD of rats, components of renin-angiotensin system (RAS) in left ventricles were assayed by quantitative real-time PCR and Western blotting analysis. Experiment 2: Rats were divided into five groups treated as follows: (1) sham-operated group; (2) SAD group; (3) SAD group treated with angiotensin II type 1 receptor (AT1R) antagonist losartan (10 mg·kg(-1)·day(-1), orally); (4) SAD group treated by ACE inhibitor ramipril (1 mg·kg(-1)·day(-1), orally); (5) SAD group treated by ramipril and the B2-kinin receptor selective antagonist HOE-140 (0.25 mg·kg(-1)·day(-1), subcutaneously). RESULTS: SAD led to augmentation of the mRNA levels and protein expression of left ventricular ACE and AT1R. Both losartan and ramipril ameliorated SAD-induced left ventricular hypertrophy. Both losartan and ramipril abated oxidative stress, suppressed inflammation, and reduced expression TGFβ-R in left ventricles. In addition, the protective effect of ramipril could be abolished by HOE-140. CONCLUSION: Local ACE is involved in the left ventricular hypertrophy induced by sinoaortic denervation in rats, via both angiotensin II/AT1R and bradykinin/B2R pathways.
INTRODUCTION: The present study was designed to test the hypothesis that local angiotensin converting enzyme (ACE) was involved in the cardiac hypertrophy induced by sinoaortic denervation (SAD) in rats. METHODS: Experiment 1: Six weeks after SAD of rats, components of renin-angiotensin system (RAS) in left ventricles were assayed by quantitative real-time PCR and Western blotting analysis. Experiment 2: Rats were divided into five groups treated as follows: (1) sham-operated group; (2) SAD group; (3) SAD group treated with angiotensin II type 1 receptor (AT1R) antagonist losartan (10 mg·kg(-1)·day(-1), orally); (4) SAD group treated by ACE inhibitor ramipril (1 mg·kg(-1)·day(-1), orally); (5) SAD group treated by ramipril and the B2-kinin receptor selective antagonist HOE-140 (0.25 mg·kg(-1)·day(-1), subcutaneously). RESULTS: SAD led to augmentation of the mRNA levels and protein expression of left ventricular ACE and AT1R. Both losartan and ramipril ameliorated SAD-induced left ventricular hypertrophy. Both losartan and ramipril abated oxidative stress, suppressed inflammation, and reduced expression TGFβ-R in left ventricles. In addition, the protective effect of ramipril could be abolished by HOE-140. CONCLUSION: Local ACE is involved in the left ventricular hypertrophy induced by sinoaortic denervation in rats, via both angiotensin II/AT1R and bradykinin/B2R pathways.