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• W2940839478 abstract "Acute respiratory distress syndrome (ARDS) is a clinical syndrome of acute lung failure in critically sick patients, which severely compromises the function of multiple organs, including the brain. Although, the optic nerve and the retina are a part of the central nervous system, the effects of ARDS on these ocular structures are completely unknown. Thus, the major goal of this study was to test the hypothesis that ARDS affects vascular function in the eye. ARDS was induced in anesthetized pigs by intratracheal injection of lipopolysaccharide (LPS). Sham-treated animals served as controls. Pigs were monitored for 8 h and then sacrificed. Subsequently, retinal arterioles and short posterior ciliary arteries were isolated and cannulated with micropipettes to measure vascular responses by videomicroscopy. Levels of reactive oxygen species (ROS) were quantified in isolated vessels using dihydroethidium (DHE). Messenger RNA expression of hypoxic, inflammatory, prooxidative, and antioxidative genes was assessed by real-time PCR. When group-dependent differences in mRNA expression levels were found for a particular gene, immunostainings were conducted. Strikingly, responses to the endothelium-dependent vasodilator, bradykinin, were markedly impaired in retinal arterioles of LPS-treated pigs, but no differences were seen between ciliary arteries of LPS- and sham-treated animals. ROS levels were increased in retinal arterioles but not in ciliary arteries of LPS-treated pigs. Messenger RNA levels for HIF-1α, VEGF-A and NOX2 were markedly increased in retinal arterioles of LPS-treated pigs, whereas ciliary arteries had only negligible mRNA level changes. Pronounced immunoreactivity for HIF-1α, VEGF-A and NOX2 was seen in the endothelium of retinal arterioles from LPS-treated pigs. Histologically, massive edema was seen especially in the retinal nerve fiber layer of pigs treated with LPS. Our study provides the first evidence that ARDS induced by intratracheal LPS application evokes endothelial dysfunction in porcine retinal arterioles together with retinal edema, indicative of vascular leakage. In contrast, ciliary arteries appear to be resistant to intratracheal LPS application." @default.
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• W2940839478 date "2019-07-01" @default.
• W2940839478 modified "2023-10-03" @default.
• W2940839478 title "Responses of retinal arterioles and ciliary arteries in pigs with acute respiratory distress syndrome (ARDS)" @default.
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• W2940839478 doi "https://doi.org/10.1016/j.exer.2019.04.021" @default.
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