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Cardiovascular Diabetology
Published in: Cardiovascular Diabetology 1/2012

Open Access 01-12-2012 | Original investigation

Effects of olmesartan on arterial stiffness in rats with chronic renal failure

Authors: Yao-Chen Chuang, Ming-Shiou Wu, Yi-Kai Su, Kwang-Ming Fang

Published in: Cardiovascular Diabetology | Issue 1/2012

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Abstract

Background

It has been suggested that the antioxidant properties of olmesartan (OLM), an angiotensin II type 1 receptor (AT1R) blocker, contribute to renal protection rather than blood pressure lowering effects despite the fact that causal relationships between hypertension and renal artery disease exist. This study aimed to examine the hypothesis whether the antioxidative activities of OLM were correlated to arterial stiffness, reactive oxygen species and advanced glycation end products (AGEs) formation in rats with chronic renal failure (CRF).

Methods

CRF rats were induced by 5/6 nephrectomy and randomly assigned to an OLM (10 mg/day) group or a control group. Hemodynamic states, oxidative stress, renal function and AGEs were measured after 8 weeks of OLM treatment.

Results

All the hemodynamic derangements associated with renal and cardiovascular dysfunctions were abrogated in CRF rats receiving OLM. Decreased cardiac output was normalized compared to control (p <0.05). Mean aortic pressure, total peripheral resistance and left ventricular weight/body weight ratio were reduced by 21.6% (p <0.05), 28.2% (p <0.05) and 27.2% ((p <0.05). OLM also showed beneficial effects on the oscillatory components of the ventricular after-load, including 39% reduction in aortic characteristic impedance (p < 0.05), 75.3% increase in aortic compliance (p <0.05) and 50.3% increase in wave transit time (p < 0.05). These results implied that OLM attenuated the increased systolic load of the left ventricle and prevented cardiac hypertrophy in CRF rats. Improved renal function was also reflected by increases in the clearances of BUN (28.7%) and serum creatinine (SCr, 38.8%). In addition to these functional improvements, OLM specifically reduced the levels of malondialdehyde (MDA) equivalents in aorta and serum by 14.3% and 25.1%, as well as the amount of AGEs in the aortic wall by 32% (p < 0.05) of CRF rats.

Conclusion

OLM treatment could ameliorate arterial stiffness in CRF rats with concomitant inhibition of MDA and AGEs levels through the reduction of oxidative stress in aortic wall.
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Metadata
Title
Effects of olmesartan on arterial stiffness in rats with chronic renal failure
Authors
Yao-Chen Chuang
Ming-Shiou Wu
Yi-Kai Su
Kwang-Ming Fang
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Cardiovascular Diabetology / Issue 1/2012
Electronic ISSN: 1475-2840
DOI
https://doi.org/10.1186/1475-2840-11-66

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