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Campo DC | Valor | Idioma |
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dc.contributor.author | Johannsson, Ora E. | - |
dc.contributor.author | Giacomin, Marina Mussoi | - |
dc.contributor.author | Sadauskas-Henrique, Helen | - |
dc.contributor.author | Campos, Derek Felipe de | - |
dc.contributor.author | Braz-Mota, Susana | - |
dc.contributor.author | Heinrichs-Caldas, Waldir D. | - |
dc.contributor.author | Baptista, Ramon B. | - |
dc.contributor.author | Wood, Chris M. | - |
dc.contributor.author | Val, Vera Maria Fonseca Almeida e | - |
dc.contributor.author | Val, Adalberto Luis | - |
dc.date.accessioned | 2020-06-15T21:36:44Z | - |
dc.date.available | 2020-06-15T21:36:44Z | - |
dc.date.issued | 2018 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/16848 | - |
dc.description.abstract | We examined whether oxidative damage and antioxidant responses are more likely to occur during hypoxia or re-oxygenation in hypoxia-tolerant fish, and whether there is an influence of the rate of re-oxygenation. An hypoxia/re-oxygenation experiment using wild-caught Cyphocharax abramoides (Rio Negro, Brazil), was designed to answer these questions. Lipid peroxidation (MDA), a measure of oxidative damage, and antioxidant activities (superoxide dismutase (SOD), glutathione peroxidase (GPx), antioxidant capacity against peroxyl radicals (ACAP)), were measured in brain, gill and liver tissues after normoxia, 3-h hypoxia (2.7 kPa), and 3-h hypoxia followed by 1-h or 3-h re-oxygenation, implemented either immediately or slowly (3.0 kPa·h−1). Critical oxygen tension of routine oxygen consumption rate (Pcrit) (4.1 kPa) and the PO2 at loss of equilibrium (LOE) (1.7 kPa) were determined to set the experimental hypoxia exposure. The Regulation Index, a measure of oxyregulation with declining PO2, was 0.32. Oxidative damage occurred during hypoxia: no additional damage was observed during re-oxygenation. Tissues responded differentially. GPx and MDA rose in the brain and gills, and SOD (and likely GPx) in the liver during hypoxia. Antioxidants increased further at LOE. Rate of oxygen increase during re-oxygenation did not affect antioxidant responses. In brain and gills, GPx and MDA decreased or recovered after 1-h re-oxygenation. In liver, SOD remained high and GPx increased. In summary, C. abramoides incurred oxidative damage during hypoxic exposure with no additional damage inflicted during re-oxygenation: the rate of re-oxygenation was inconsequential. Literature data support conclusion of greater damage during hypoxia than during re-oxygenation in hypoxia-tolerant fish. © 2018 Elsevier Inc. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 224, Pags. 53-67 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Antioxidant | en |
dc.subject | Glutathione Peroxidase | en |
dc.subject | Malonaldehyde | en |
dc.subject | Peroxy Radical | en |
dc.subject | Superoxide Dismutase | en |
dc.subject | Fish Protein | en |
dc.subject | Glutathione Peroxidase | en |
dc.subject | Malonaldehyde | en |
dc.subject | Oxygen | en |
dc.subject | Peroxide | en |
dc.subject | Superoxide Dismutase | en |
dc.subject | Animals Experiment | en |
dc.subject | Animals Tissue | en |
dc.subject | Antioxidant Activity | en |
dc.subject | Brain Tissue | en |
dc.subject | Characidae | en |
dc.subject | Controlled Study | en |
dc.subject | Cyphocharax Abramoides | en |
dc.subject | Experimental Hypoxia | en |
dc.subject | Gill | en |
dc.subject | Hypoxia | en |
dc.subject | Lipid Peroxidation | en |
dc.subject | Liver Tissue | en |
dc.subject | Nonhuman | en |
dc.subject | Oxidative Stress | en |
dc.subject | Oxygen Consumption | en |
dc.subject | Oxygen Tension | en |
dc.subject | Reoxygenation | en |
dc.subject | Animals | en |
dc.subject | Brain | en |
dc.subject | Characidae | en |
dc.subject | Hypoxia | en |
dc.subject | Liver | en |
dc.subject | Metabolism | en |
dc.subject | Pathophysiology | en |
dc.subject | Physiology | en |
dc.subject | River | en |
dc.subject | Animal | en |
dc.subject | Antioxidants | en |
dc.subject | Brain | en |
dc.subject | Characidae | en |
dc.subject | Fish Proteins | en |
dc.subject | Gills | en |
dc.subject | Glutathione Peroxidase | en |
dc.subject | Hypoxia | en |
dc.subject | Lipid Peroxidation | en |
dc.subject | Liver | en |
dc.subject | Malondialdehyde | en |
dc.subject | Oxidative Stress | en |
dc.subject | Oxygen | en |
dc.subject | Peroxides | en |
dc.subject | Rivers | en |
dc.subject | Superoxide Dismutase | en |
dc.title | Does hypoxia or different rates of re-oxygenation after hypoxia induce an oxidative stress response in Cyphocharax abramoides (Kner 1858), a Characid fish of the Rio Negro? | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1016/j.cbpa.2018.05.019 | - |
dc.publisher.journal | Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology | pt_BR |
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