Key result
Oral administration of ramipril significantly reduced cardiac collagen deposition (1.9% vs 2.9%, p<0.05) and attenuated oxidative stress in rats with adjuvant-induced arthritis.
Why the study?
Does ramipril reduce oxidative stress and cardiac fibrosis in a rat model of adjuvant-induced arthritis?
Does ramipril reduce oxidative stress and cardiac fibrosis in a rat model of adjuvant-induced arthritis?
Ramipril attenuates cardiac oxidative stress and fibrosis in a rat model of rheumatoid arthritis, highlighting its potential to prevent RA-associated heart disease.
Answers are grounded in this paper and cite their sources.
Supports ramipril investigation for RA cardiac fibrosis in animals; leaves open human translation and clinical testing.
INTRODUCTION: Recent studies revealed that co-morbidity and mortality due to cardiovascular disease are increased in patients with rheumatoid arthritis (RA) but little is known about factors involved in these manifestations. This study aimed at characterizing the impact of arthritis on oxidative stress status and tissue fibrosis in the heart of rats with adjuvant-induced arthritis (AIA). METHODS: AIA was induced with complete Freund's adjuvant in female Lewis rats. Animals were treated by oral administration of vehicle or angiotensin-converting enzyme inhibitor ramipril (10 mg/kg/day) for 28 days, beginning 1 day after arthritis induction. Isolated adult cardiomyocytes were exposed to 10 μM 4-hydroxynonenal (HNE) for 24 hours in the presence or absence of 10 μM ramipril. RESULTS: Compared to controls, AIA rats showed significant 55 and 30% increase of 4-HNE/protein adducts in serum and left ventricular (LV) tissues, respectively. Cardiac mitochondrial NADP+-isocitrate dehydrogenase (mNADP-ICDH) activity decreased by 25% in AIA rats without any changes in its protein and mRNA expression. The loss of mNADP-ICDH activity was correlated with enhanced accumulation of HNE/mNADP-ICDH adducts as well as with decrease of glutathione and NADPH. Angiotensin II type 1 receptor (AT1R) expression and tissue fibrosis were induced in LV tissues from AIA rats. In isolated cardiomyocytes, HNE significantly decreased mNADP-ICDH activity and enhanced type I collagen and connective tissue growth factor expression. The oral administration of ramipril significantly reduced HNE and AT1R levels and restored mNADP-ICDH activity and redox status in LV tissues of AIA rats. The protective effects of this drug were also evident from the decrease in arthritis scoring and inflammatory markers. CONCLUSION: Collectively, our findings disclosed that AIA induced oxidative stress and fibrosis in the heart. The fact that ramipril attenuates inflammation, oxidative stress and tissue fibrosis may provide a novel strategy to prevent heart diseases in RA.
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Shi et al. (2012) studied Rheumatoid arthritis (Adjuvant-induced arthritis model) (n=30). Ramipril vs. Vehicle (0.01% DMSO) was evaluated on Cardiac collagen content (%) (p=<0.05). Oral administration of ramipril significantly reduced cardiac collagen deposition (1.9% vs 2.9%, p<0.05) and attenuated oxidative stress in rats with adjuvant-induced arthritis.
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