Enhancement by Hydrogen Peroxide of Calcium Signals in Endothelial Cells Induced by 5-HT1B and 5-HT2B Receptor Agonists.
Oxid Med Cell Longev
; 2019: 1701478, 2019.
Article
em En
| MEDLINE
| ID: mdl-30886671
ABSTRACT
Hydrogen peroxide, formed in the endothelium, acts as a factor contributing to the relaxation of blood vessels. The reason for this vasodilatory effect could be modulation by H2O2 of calcium metabolism, since mobilization of calcium ions in endothelial cells is a trigger of endothelium-dependent relaxation. The aim of this work was to investigate the influence of H2O2 on the effects of Ca2+-mobilizing agonists in human umbilical vein endothelial cells (HUVEC). We have found that H2O2 in concentration range 10-100 µM increases the rise of [Ca2+]i induced by 5-hydroxytryptamine (5-HT) and carbachol and does not affect the calcium signals of ATP, agonist of type 1 protease-activated receptor SFLLRN, histamine and bradykinin. Using specific agonists of 5-HT1B and 5-HT2B receptors CGS12066B and BW723C86, we have demonstrated that H2O2 potentiates the effects mediated by these types of 5-HT receptors. Potentiation of the effect of BW723C86 can be produced by the induction of endogenous oxidative stress in HUVEC. We have shown that the activation of 5-HT2B receptor by BW723C86 causes production of reactive oxygen species (ROS). Inhibitor of NADPH oxidases VAS2870 suppressed formation of ROS and partially inhibited [Ca2+]i rise induced by BW723C86. Thus, it can be assumed that vasorelaxation induced by endogenous H2O2 in endothelial cells partially occurs due to the potentiation of the agonist-induced calcium signaling.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sinalização do Cálcio
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Receptor 5-HT1B de Serotonina
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Receptor 5-HT2B de Serotonina
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Agonistas do Receptor 5-HT1 de Serotonina
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Agonistas do Receptor 5-HT2 de Serotonina
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Células Endoteliais da Veia Umbilical Humana
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Peróxido de Hidrogênio
Limite:
Humans
Idioma:
En
Revista:
Oxid Med Cell Longev
Assunto da revista:
METABOLISMO
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Federação Russa