Effects of perindopril, propranolol, and dihydrochlorothiazide on cardiovascular remodelling in spontaneously hypertensive rats.
Abstract
AIM:
To investigate the effects of perindopril, propranolol, and dihydrochlorothiazide on artery wall thickening, left ventricular hypertrophy, and cardiac fibrosis in spontaneously hypertensive rats (SHR).
METHODS:
After measurement of systolic blood pressure (SBP), 16-wk-old Male SHR were randomly divided into 3 groups (each n = 10), given perindopril (Per, 5 mg.kg-1.d-1), propranolol (Pro, 40 mg.kg-1.d-1), dihydrochlorothiazide (DCT, 100 mg.kg-1.d-1) respectively by gavage for 12 wk. Sex-, age-, and number-matched untreated SHR and normotensive Wistar Kyoto rats (WKY) served as controls. When the treatment finished, body weights (BW) and SBP were measured before decapitation of the rats. The heart was excised rapidly, the left ventricle was weighed and then subjected to collagen content analysis. Vascular wall and lumen ratio from aorta, renal arteries and branch III vessels of mesenteric arteries were determined morphometrically.
RESULTS:
Treated rats in 3 groups showed a lower SBP and the ratio of left ventricle weight to body weight (LVW/BW) compared with WKY. Artery wall thickening was similarly inhibited in the treated groups. Per and Pro inhibited cardiac fibrosis, but collagen concentration increased in DCT treated SHR [collagen volume fraction (CVF): 19 +/- 4 vs SHR 14 +/- 4, P < 0.05; perivascular collagen fraction(PVCF): 84 +/- 7 vs SHR 79 +/- 5, P < 0.05].
CONCLUSION:
Per and Pro inhibited, but DCT promoted, cardiac fibrosis.
Keywords:
To investigate the effects of perindopril, propranolol, and dihydrochlorothiazide on artery wall thickening, left ventricular hypertrophy, and cardiac fibrosis in spontaneously hypertensive rats (SHR).
METHODS:
After measurement of systolic blood pressure (SBP), 16-wk-old Male SHR were randomly divided into 3 groups (each n = 10), given perindopril (Per, 5 mg.kg-1.d-1), propranolol (Pro, 40 mg.kg-1.d-1), dihydrochlorothiazide (DCT, 100 mg.kg-1.d-1) respectively by gavage for 12 wk. Sex-, age-, and number-matched untreated SHR and normotensive Wistar Kyoto rats (WKY) served as controls. When the treatment finished, body weights (BW) and SBP were measured before decapitation of the rats. The heart was excised rapidly, the left ventricle was weighed and then subjected to collagen content analysis. Vascular wall and lumen ratio from aorta, renal arteries and branch III vessels of mesenteric arteries were determined morphometrically.
RESULTS:
Treated rats in 3 groups showed a lower SBP and the ratio of left ventricle weight to body weight (LVW/BW) compared with WKY. Artery wall thickening was similarly inhibited in the treated groups. Per and Pro inhibited cardiac fibrosis, but collagen concentration increased in DCT treated SHR [collagen volume fraction (CVF): 19 +/- 4 vs SHR 14 +/- 4, P < 0.05; perivascular collagen fraction(PVCF): 84 +/- 7 vs SHR 79 +/- 5, P < 0.05].
CONCLUSION:
Per and Pro inhibited, but DCT promoted, cardiac fibrosis.