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- W2097716096 abstract "Chlorine gas (Cl(2)) exposure during accidents or in the military setting results primarily in injury to the lungs. However, the potential for Cl(2) exposure to promote injury to the systemic vasculature leading to compromised vascular function has not been studied. We hypothesized that Cl(2) promotes extrapulmonary endothelial dysfunction characterized by a loss of endothelial nitric oxide synthase (eNOS)-derived signaling. Male Sprague Dawley rats were exposed to Cl(2) for 30 minutes, and eNOS-dependent vasodilation of aorta as a function of Cl(2) dose (0-400 ppm) and time after exposure (0-48 h) were determined. Exposure to Cl(2) (250-400 ppm) significantly inhibited eNOS-dependent vasodilation (stimulated by acetycholine) at 24 to 48 hours after exposure without affecting constriction responses to phenylephrine or vasodilation responses to an NO donor, suggesting decreased NO formation. Consistent with this hypothesis, eNOS protein expression was significantly decreased (∼ 60%) in aorta isolated from Cl(2)-exposed versus air-exposed rats. Moreover, inducible nitric oxide synthase (iNOS) mRNA was up-regulated in circulating leukocytes and aorta isolated 24 hours after Cl(2) exposure, suggesting stimulation of inflammation in the systemic vasculature. Despite decreased eNOS expression and activity, no changes in mean arterial blood pressure were observed. However, injection of 1400W, a selective inhibitor of iNOS, increased mean arterial blood pressure only in Cl(2)-exposed animals, suggesting that iNOS-derived NO compensates for decreased eNOS-derived NO. These results highlight the potential for Cl(2) exposure to promote postexposure systemic endothelial dysfunction via disruption of vascular NO homeostasis mechanisms." @default.
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- W2097716096 date "2011-08-01" @default.
- W2097716096 modified "2023-10-18" @default.
- W2097716096 title "Chlorine Gas Exposure Causes Systemic Endothelial Dysfunction by Inhibiting Endothelial Nitric Oxide Synthase–Dependent Signaling" @default.
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- W2097716096 doi "https://doi.org/10.1165/rcmb.2010-0151oc" @default.
- W2097716096 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3175567" @default.
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