• Patrick Türck, Schauana Fraga, Isadora Salvador, Cristina Campos-Carraro, Denise Lacerda, Alan Bahr, Vanessa Ortiz, Alexandre Hickmann, Mariana Koetz, Adriane Belló-Klein, Amélia Henriques, Fabiana Agostini, and Alex Sander da Rosa Araujo.
• Department of Physiology, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Brazil. Electronic address: p.turck@gmail.com.
• Nutrition. 2020 Feb 1; 70: 110579.

ObjectivesPulmonary arterial hypertension (PAH) is a condition characterized by an increased resistance of pulmonary vasculature, culminating in an increase in pulmonary pressure. This process involves disturbances in lung redox homeostasis, causing progressive right heart failure. In this context, the use of natural antioxidants, such as those found in blueberries, may represent a therapeutic approach. The aim of this study was to evaluate the effect of blueberry extract (BB) on functional parameters and oxidative stress levels in rat lungs with induced PAH.MethodsForty-eight male Wistar rats (weighing 200 ± 20 g) were randomized into five groups: control, monocrotaline, monocrotaline + BB 50, monocrotaline + BB 100, and monocrotaline + BB 200. PAH was induced by the administration of monocrotaline (60 mg/kg, intraperitoneal). Rats were treated with BB at doses of 50, 100, and 200 mg/kg via gavage for 5 wk (2 wk before monocrotaline and 3 wk after monocrotaline injection). At day 35, rats were submitted to echocardiography and catheterization. They were then sacrificed and lungs were harvested for biochemical analyses.ResultsBB increased the E/A ratio of blood flow across the tricuspid valve and tricuspid annular phase systolic excursion, as wells as decreased the mean pulmonary artery pressure of animals compared with the PAH group. Moreover, BB decreased total reactive species concentration and lipid oxidation, reduced activity of nicotinamide adenine dinucleotide phosphate oxidase and expression of xanthine oxidase, increased the activity of superoxide dismutase and restored sulfhydryl content in the animal lungs compared with those in the PAH group. Additionally, BB restored expression of the antioxidant transcriptional factor Nrf2 in the lungs of the animal subjects. Finally, BB normalized the endothelin receptor (ETA/ETB) expression ratio in the animal lungs, which were increased in the PAH group.ConclusionIntervention with BB mitigated functional PAH outcomes through improvement of the pulmonary redox state. Our results provide a basis for future research on natural antioxidant interventions as a novel treatment strategy in PAH.Copyright © 2019 Elsevier Inc. All rights reserved.

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