Upregulation of Orai Channels Contributes to Aging-Related Vascular Alterations in Rat Coronary Arteries

Vascular territories display heterogeneous sensitivity to the impacts of aging. The relevance of the STIM/Orai system to vascular function depends on the vascular bed. We aimed to evaluate the contribution of the STIM/Orai system to aging-related vascular dysfunction in rat coronary circulation. Vas...

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Published in:International journal of molecular sciences 2023-09, Vol.24 (17), p.13402
Main Authors: Angulo, Javier, Fernández, Argentina, Sevilleja-Ortiz, Alejandro, Sánchez-Ferrer, Alberto, Rodríguez-Mañas, Leocadio, El Assar, Mariam
Format: Article
Language:English
Subjects:
Aging
arterial hypercontractility
Arteries
coronary artery
Coronary vessels
endothelial function
Endothelin
Endothelium
Gerontology
Orai channel
Serotonin
Smooth muscle
vascular aging
Veins & arteries
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container_issue 17
container_start_page 13402
container_title International journal of molecular sciences
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creator Angulo, Javier
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Sevilleja-Ortiz, Alejandro
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Rodríguez-Mañas, Leocadio
El Assar, Mariam
description Vascular territories display heterogeneous sensitivity to the impacts of aging. The relevance of the STIM/Orai system to vascular function depends on the vascular bed. We aimed to evaluate the contribution of the STIM/Orai system to aging-related vascular dysfunction in rat coronary circulation. Vascular function was evaluated according to myography in coronary arteries from young (three-month-old) and older (twenty-month-old) rats. The effects of aging and STIM/Orai inhibition on the contraction and relaxation of the coronary arteries and on the protein expression of STIM-1, Orai1, and Orai3 in these vessels were determined. Aging-related hypercontractility to serotonin and endothelin-1 in arteries from male rats was reversed by STIM/Orai inhibition with YM-58483 or by specifically blocking the Orai1 channel with Synta66. The inhibitory effects of Synta66 on coronary vasoconstriction were also observed in older female rats. YM-58483 relaxed serotonin- but not KCl-contracted arteries from males. STIM/Orai inhibition improved defective endothelial vasodilations in aged arteries, even in the presence of NO synthase and cyclooxygenase inhibitors, but not in KCl-contracted segments. YM-58483 significantly enhanced relaxations to calcium-activated potassium channel stimulation in aged vessels. Increased protein expression of Orai1 and Orai3 was detected in arterial homogenates and sections from older rats. Upregulation of the Orai channel contributes to aging-related coronary dysfunction, revealing a potential target in reducing CVD risk.
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subjects Aging
arterial hypercontractility
Arteries
coronary artery
Coronary vessels
endothelial function
Endothelin
Endothelium
Gerontology
Orai channel
Serotonin
Smooth muscle
vascular aging
Veins & arteries
title Upregulation of Orai Channels Contributes to Aging-Related Vascular Alterations in Rat Coronary Arteries
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