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• W2170698553 endingPage "C568" @default.
• W2170698553 startingPage "C555" @default.
• W2170698553 abstract "While nitric oxide (NO)-mediated biological interactions have been intensively studied, the underlying mechanisms of nitrosative stress with resulting pathology remain unclear. Previous studies have demonstrated that NO exposure increases free zinc ions (Zn 2+ ) within cells. However, the resulting effects on endothelial cell survival have not been adequately resolved. Thus the purpose of this study was to investigate the role of altered zinc homeostasis on endothelial cell survival. Initially, we confirmed the previously observed significant increase in free Zn 2+ with a subsequent induction of apoptosis in our pulmonary artery endothelial cells (PAECs) exposed to the NO donor N-[2-aminoethyl]- N-[2-hydroxy-2-nitrosohydrazino]-1,2-ethylenediamine. However, NO has many effects upon cell function and we wanted to specifically evaluate the effects mediated by zinc. To accomplish this we utilized the direct addition of zinc chloride (ZnCl 2 ) to PAEC. We observed that Zn 2+ -exposed PAECs exhibited a dose-dependent increase in superoxide (O 2 − ·) generation that was localized to the mitochondria. Furthermore, we found Zn 2+ -exposed PAECs exhibited a significant reduction in mitochondrial membrane potential, loss of cardiolipin from the inner leaflet, caspase activation, and significant increases in TdT-mediated dUTP nick end labeling-positive cells. Furthermore, using an adenoviral construct for the overexpression of the Zn 2+ -binding protein, metallothionein-1 (MT-1), we found either MT-1 overexpression or coincubation with a Zn 2+ -selective chelator, N, N,N′, N′-tetrakis(2-pyridylmethyl)ethylene-diamide, in PAECs significantly protected the mitochondria from both NO and Zn 2+ -mediated disruption and induction of apoptosis and cell death. In summary, our results indicate that a loss of Zn 2+ homeostasis produces mitochondrial dysfunction, increased oxidative stress, and apoptotic cell death. We propose that regulation of Zn 2+ levels may represent a potential therapeutic target for disease associated with both nitrosative and oxidative stress." @default.
• W2170698553 created "2016-06-24" @default.
• W2170698553 creator A5016644607 @default.
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• W2170698553 date "2006-09-01" @default.
• W2170698553 modified "2023-10-01" @default.
• W2170698553 title "Endothelial response to stress from exogenous Zn²⁺resembles that of NO-mediated nitrosative stress, and is protected by MT-1 overexpression" @default.
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• W2170698553 doi "https://doi.org/10.1152/ajpcell.00509.2005" @default.
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• W2170698553 hasPublicationYear "2006" @default.
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