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Quercetin decreases cardiac hypertrophic mediators and maladaptive coronary arterial remodeling in renovascular hypertensive rats without improving cardiac function

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Abstract

Oxidative stress and MMP activity are found in the hearts and arteries in hypertension and contribute to the resulting hypertrophy and dysfunction. Quercetin is a flavonoid that reduces MMP-2 activity and ameliorates hypertrophic vascular remodeling of hypertension. The hypothesis is that treatment of hypertensive rats with quercetin ameliorates coronary maladaptive remodeling and decreases hypertrophic cardiac dysfunction by decreasing oxidative stress and MMP activity. Male Sprague–Dawley two-kidney, one-clip (2K1C) and Sham rats were treated with quercetin (10 mg/kg/day) or its vehicle for 8 weeks by gavage. Rats were analyzed at 10 weeks of hypertension. Systolic blood pressure (SBP) was examined by tail-cuff plethysmography. Cardiac left ventricles were used to determine MMP activity by in situ zymography and oxidative stress by dihydroethidium. Immunofluorescence was performed to detect transforming growth factor (TGF)-β and nuclear factor kappa B (NFkB). Morphological analyses of heart and coronary arteries were done by H&E and picrosirius red, and cardiac function was measured by Langendorff. SBP was increased in 2K1C rats, and quercetin did not reduce it. However, quercetin decreased both oxidative stress and TGF-β in the left ventricles of 2K1C rats. Quercetin also decreased the accentuated MMP activity in left ventricles and coronary arteries of 2K1C rats. Quercetin ameliorated hypertension-induced coronary arterial hypertrophic remodeling, although it did not reduce cardiac hypertrophic remodeling and dysfunction. Quercetin decreases cardiac oxidative stress and TGF-β and MMP activity in addition to improving coronary remodeling, yet does not ameliorate cardiac dysfunction in 2K1C rats.

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Funding

This work is supported by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Pesquisa e Desenvolvimento Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Apoio ao Ensino, Pesquisa e Assistência (FAEPA), Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo.

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The authors declare that all data were generated in-house and that no paper mill was used. E.V.R. is an undergraduate student who treated the animals and performed most of the experiments such as tail-cuff plethysmography, DHE, immunofluorescence of TGF-β and NFkB, in situ zymography, and picrosirius red of coronary arteries. F.F. is also an undergraduate student who treated the animals and performed tail-cuff plethysmography, DHE, and zymography analyses. L.P. is a post-doctoral fellow who helped to coordinate the study and performed in situ zymography, histological preparation, quantification of cardiac morphological parameters, and Langendorff. M.M.B.M is a PhD student who performed DHE, immunofluorescence of TGF-β and NFkB, and in situ zymography in addition to prepare and analyze the data. J.M.P performed H&E and the quantification of cardiac morphological parameters. R.C.N. is a PhD student and performed Langendorff. B.Q.G. is a master student who performed the Picrosirius red quantification of coronary arteries. G.B. performed ELISA for TNF-α in the heart. J.M.S.L. executed lucigenin chemiluminescence. J.E.T.S. helped to revise the manuscript. MMC designed the hypothesis, coordinated the experiments, and wrote the manuscript. All authors have read and revised the manuscript.

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Correspondence to Michele M. Castro.

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The experimental protocols were approved by the Ethics Committee on Animal Research of Ribeirao Preto Medical School (090/2020) and were in accordance with the Guidelines for the Care and Use of Laboratory Animals published by the National Institutes of Health and Conselho Nacional de Controle de Experimentação Animal.

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The authors declare no competing interests.

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da Rocha, E.V., Falchetti, F., Pernomian, L. et al. Quercetin decreases cardiac hypertrophic mediators and maladaptive coronary arterial remodeling in renovascular hypertensive rats without improving cardiac function. Naunyn-Schmiedeberg's Arch Pharmacol 396, 939–949 (2023). https://doi.org/10.1007/s00210-022-02349-6

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  • DOI: https://doi.org/10.1007/s00210-022-02349-6

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