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Blueberry extract improves redox balance and functional parameters in the right ventricle from rats with pulmonary arterial hypertension

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Abstract

Purpose

Pulmonary arterial hypertension (PAH) is a disease characterized by increased pulmonary vascular resistance and right ventricle (RV) failure. In this context, oxidative stress is an essential element contributing to PAH’s pathophysiology. Thus, blueberry (BB), which has a high antioxidant capacity, emerges as a natural therapeutic approach in PAH. This work evaluated the effect of BB extract on redox balance in RV in a PAH’s animal model.

Methods

Male Wistar rats (200 ± 20 g) (n = 72) were randomized into eight groups: control (CTR); monocrotaline (MCT); CTR and MCT treated at doses of 50, 100, and 200 mg/kg BB. PAH was induced by administration of MCT (60 mg/kg, intraperitoneal). Rats were treated with BB orally for 5 weeks (2 weeks before monocrotaline and 3 weeks after monocrotaline injection). On day 35, rats were submitted to echocardiography and catheterization, then euthanasia and RV harvesting for biochemical analyses.

Results

RV hypertrophy, observed in the MCT groups, was reduced with BB treatment. MCT elevated RV systolic pressure and pressure/time derivatives, while the intervention with BB decreased these parameters. PAH decreased RV output and pulmonary artery outflow acceleration/ejection time ratio, while increased RV diameters, parameters restored by BB treatment. Animals from the MCT group showed elevated lipid peroxidation and NADPH oxidase activity, outcomes attenuated in animals treated with BB, which also led to increased catalase activity.

Conclusion

Treatment with BB partially mitigated PAH, which could be associated with improvement of RV redox state. Such findings constitute an advance in the investigation of the role of BB extract in chronic progressive cardiovascular diseases that involve the redox balance, such as PAH.

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Funding

This work received financial support from the following Brazilian development agencies: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS).

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Author notes

  1. Patrick Türck and Isadora Schein Salvador have contributed equally to this work.

Authors and Affiliations

  1. Department of Physiology, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil

    Patrick Türck, Isadora Schein Salvador, Cristina Campos-Carraro, Vanessa Ortiz, Alan Bahr, Adriane Belló-Klein & Alex Sander da Rosa Araujo

  2. Postgraduate Program in Biological Sciences: Physiology, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil

    Patrick Türck, Cristina Campos-Carraro, Vanessa Ortiz, Alan Bahr, Adriane Belló-Klein & Alex Sander da Rosa Araujo

  3. Cardiovascular Research Laboratory, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil

    Michael Andrades

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  1. Patrick Türck
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Animal studies were performed according to “Guide for the Care and Use of Laboratory Animals (8th edition, 2011) of the National Research Council of the National Academies (National Research Council (US) Committee for the Update of the Guide for the Care and Use of Laboratory Animals, 2011) and approved by Ethical Committee for Animal Experimentation from Federal University of Rio Grande do Sul (project number #32192).

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Türck, P., Salvador, I.S., Campos-Carraro, C. et al. Blueberry extract improves redox balance and functional parameters in the right ventricle from rats with pulmonary arterial hypertension. Eur J Nutr 61, 373–386 (2022). https://doi.org/10.1007/s00394-021-02642-9

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