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http://acervodigital.unesp.br/handle/11449/128465
- Title:
- The PI3K-Akt-eNOS pathway is involved in aortic hyporeactivity to Phenylephrine associated with late pregnancy in spontaneously hypertensive rats
- Sociedade Brasileira de Fisiologia (SBFis)
- Universidade Estadual Paulista (UNESP)
- Universidade Paulista (UNIP)
- 0024-3205
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- FAPESP: 2012/20398-6
- FAPESP: 2012/05746-8
- Aim: This study aimed to evaluate the effects of Wortmannin, an inhibitor of phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt), on aortic hyporeactivity to Phenylephrine (Phe) and nitric oxide bioavailability associated with pregnancy in hypertensive rats.Main methods: The intact aortic rings of pregnant and non-pregnant Wistar or spontaneously hypertensive rats (SHRs) were stimulated with Phe (1 nmol/L to 10 mmol/L) before and after incubation with Wortmannin (10 nmol/L, 30 min). Western blot experiments analyzed the expression of phosphorylated PI3K [p85-PI3K], Akt [p-Akt (Ser 473)] and eNOS [p-eNOS (Ser 1177)] in aorta homogenates of pregnant and non-pregnant Wistar rats or SHRs. The effect of Wortmannin (10 nmol/L) on the cytosolic concentrations of nitric oxide (NO; measured using 4,5-diaminofluorescein diacetate [DAF-2DA], 10 mmol/L), Ca2+ (using Fluo 3-AM, 5 mu mol/L) and reactive oxygen species (ROS; using dihydroethidium [DHE], 2.5 mmol/L) were measured fluorimetrically in freshly isolated endothelial cells.Key findings: Wortmannin increases the reactivity of the aorta to Phe and decreases NO concentrations in the aortic endothelial cells of pregnant Wistar rats and SHR.Significance: The PI3/AKT/endothelial nitric oxide synthase (eNOS) pathway contributes to aortic hyporeactivity to Phenylephrine associated with pregnancy in normo- and hypertensive rats. (C) 2014 Elsevier Inc. All rights reserved.
- 1-Feb-2015
- Life Sciences, v. 122, p. 78-86, 2015.
- 78-86
- Elsevier B.V.
- Wortmannin
- Aorta
- Phenylephrine
- Pregnancy
- Nitric oxide
- Spontaneously hypertensive rats
- http://www.sciencedirect.com/science/article/pii/S0024320514009771
- Acesso aberto
- outro
- http://repositorio.unesp.br/handle/11449/128465
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