Glycosylation with O-linked β-N-acetylglucosamine induces vascular dysfunction via production of superoxide anion/reactive oxygen species
| العنوان: | Glycosylation with O-linked β-N-acetylglucosamine induces vascular dysfunction via production of superoxide anion/reactive oxygen species |
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| المؤلفون: | Fernanda R. Giachini, Rheure Alves-Lopes, Jéssica S. G. Miguez, Victor V. Lima, Rita de Cássia Tostes, Fabíola Mestriner, Karla B Neves, Vanessa Dela Justina, Leonardo Souza-Silva |
| المصدر: | Canadian Journal of Physiology and Pharmacology. 96:232-240 |
| بيانات النشر: | Canadian Science Publishing, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Male, 0301 basic medicine, Glycosylation, Vascular smooth muscle, Physiology, Aorta, Thoracic, Vasodilation, 030204 cardiovascular system & hematology, medicine.disease_cause, Acetylglucosamine, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Superoxides, Physiology (medical), medicine, Animals, Rats, Wistar, Pharmacology, chemistry.chemical_classification, Reactive oxygen species, NADPH oxidase, biology, Chemistry, Superoxide, NADPH Oxidases, General Medicine, Molecular biology, Rats, Enzyme Activation, 030104 developmental biology, Biochemistry, Apocynin, cardiovascular system, biology.protein, Endothelium, Vascular, P22phox, Oxidative stress |
| الوصف: | Overproduction of superoxide anion (•O2−) and O-linked β-N-acetylglucosamine (O-GlcNAc) modification in the vascular system are contributors to endothelial dysfunction. This study tested the hypothesis that increased levels of O-GlcNAc-modified proteins contribute to •O2− production via activation of NADPH oxidase, resulting in impaired vasodilation. Rat aortic segments and vascular smooth muscle cells (VSMCs) were incubated with vehicle (methanol) or O-(2-acetamido-2-deoxy-d-glucopyranosylidenamino) N-phenylcarbamate (PUGNAc) (100 μM). PUGNAc produced a time-dependent increase in O-GlcNAc levels in VSMC and decreased endothelium-dependent relaxation, which was prevented by apocynin and tiron, suggesting that •O2− contributes to endothelial dysfunction under augmented O-GlcNAc levels. Aortic segments incubated with PUGNAc also exhibited increased levels of reactive oxygen species, assessed by dihydroethidium fluorescence, and augmented •O2− production, determined by lucigenin-enhanced chemiluminescence. Additionally, PUGNAc treatment increased Nox-1 and Nox-4 protein expression in aortas and VSMCs. Translocation of the p47phox subunit from the cytosol to the membrane was greater in aortas incubated with PUGNAc. VSMCs displayed increased p22phox protein expression after PUGNAc incubation, suggesting that NADPH oxidase is activated in conditions where O-GlcNAc protein levels are increased. In conclusion, O-GlcNAc levels reduce endothelium-dependent relaxation by overproduction of •O2− via activation of NADPH oxidase. This may represent an additional mechanism by which augmented O-GlcNAc levels impair vascular function. |
| تدمد: | 1205-7541 0008-4212 |
| DOI: | 10.1139/cjpp-2017-0225 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4917b04e81fa86033dadad489cc83f2 https://doi.org/10.1139/cjpp-2017-0225 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....e4917b04e81fa86033dadad489cc83f2 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 12057541 00084212 |
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| DOI: | 10.1139/cjpp-2017-0225 |