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Life Sci ; 144: 178-84, 2016 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-26674464

RESUMO

AIMS: We determined whether decreased reactive oxygen species (ROS) production in the aorta of pregnant spontaneously hypertensive rats (SHR) resulted in increased nitric oxide (NO) bioavailability and hyporeactivity to phenylephrine (PE). MAIN METHODS: Systemic and aortic oxidative stress were measured in pregnant and non-pregnant Wistar rats and SHR. Furthermore, the hypotensive effects of apocynin (30 mg/kg) and Tempol (30 mg/kg) were analyzed. Intact aortic rings of pregnant and non-pregnant rats were stimulated with PE in the absence of or after incubation (30 min) with apocynin (100 µmol/L). The effect of apocynin on the concentrations of NO and ROS were measured in aortic endothelial cells (AEC) using DAF-2DA (10 mmol/L) and DHE (2.5 mmol/L), respectively. Western blotting was performed to analyze eNOS, NOX1, NOX2, NOX4 and SOD expression. ROS production was analyzed by the lucigenin chemiluminescence method. KEY FINDINGS: Aortic oxidative stress and ROS concentration in AEC were reduced in pregnant Wistar rats and SHR, when compared to non-pregnant rats. ROS production and NOX1, NOX2 and NOX4 expression in the aortas were decreased in pregnant SHR, but not in pregnant Wistar rats. Increased eNOS expression in aortas and NO concentration in AEC were observed in pregnant Wistar rats and SHR. Apocynin reduced PE-induced vasoconstriction in the aortas of non-pregnant Wistar rats and SHR, and pregnant Wistar rats, but not in the aortas of pregnant SHR. SIGNIFICANCE: Taken together, these results suggest that ROS production was decreased in the aortas of pregnant SHR and could contribute to higher NO bioavailability and hyporeactivity to PE in the aortas of pregnant SHR.


Assuntos
Aorta Torácica/enzimologia , Cardiotônicos/farmacologia , Glicoproteínas de Membrana/biossíntese , NADH NADPH Oxirredutases/biossíntese , NADPH Oxidases/biossíntese , Fenilefrina/farmacologia , Espécies Reativas de Oxigênio/metabolismo , Animais , Anti-Hipertensivos/farmacologia , Aorta Torácica/efeitos dos fármacos , Pressão Sanguínea/efeitos dos fármacos , Feminino , Frequência Cardíaca/efeitos dos fármacos , Técnicas In Vitro , NADPH Oxidase 1 , NADPH Oxidase 2 , NADPH Oxidase 4 , Óxido Nítrico/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Gravidez , Ratos , Ratos Endogâmicos SHR , Ratos Wistar , Vasoconstrição/efeitos dos fármacos
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