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Campo DC | Valor | Idioma |
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dc.contributor.author | Richards, Jeffrey G. | - |
dc.contributor.author | Wang, Yuxiang S. | - |
dc.contributor.author | Brauner, Colin John | - |
dc.contributor.author | Gonzalez, Richard J. | - |
dc.contributor.author | Patrick, Marjorie L. | - |
dc.contributor.author | Schulte, Patricia | - |
dc.contributor.author | Choppari-Gomes, A. R. | - |
dc.contributor.author | Val, Vera Maria Fonseca Almeida e | - |
dc.contributor.author | Val, Adalberto Luis | - |
dc.date.accessioned | 2020-06-15T22:02:30Z | - |
dc.date.available | 2020-06-15T22:02:30Z | - |
dc.date.issued | 2007 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/18676 | - |
dc.description.abstract | We examined the metabolic and ionoregulatory responses of the Amazonian cichlid, Astronotus ocellatus, to 20 h exposure to severe hypoxia (0.37 ± 0.19 mg O2/l; 4.6% air saturation) or 8 h severe hypoxia followed by 12 h recovery in normoxic water. During 20 h exposure to hypoxia, white muscle [ATP] was maintained at normoxic levels primarily through a 20% decrease in [creatine phosphate] (CrP) and an activation of glycolysis yielding lactate accumulation. Muscle lactate accumulation maintained cytoplasmic redox state ([NAD+]/[NADH]) and was associated with an inactivation of the mitochondrial enzyme pyruvate dehydrogenase (PDH). The inactivation of PDH was not associated with significant changes in cytoplasmic allosteric modulators ([ADPfree], redox state, or [pyruvate]). Hypoxia exposure caused a ∼65% decrease in gill Na+/K+ ATPase activity, which was not matched by changes in Na+/K+ ATPase α-subunit protein abundance indicating post-translational modification of Na+/K+ ATPase was responsible for the decrease in activity. Despite decreases in gill Na+/K+ ATPase activity, plasma [Na+] increased, but this increase was possibly due to a significant hemoconcentration and fluid shift out of the extracellular space. Hypoxia caused an increase in Na+/K+ ATPase α-subunit mRNA abundance pointing to either reduced mRNA degradation during exposure to hypoxia or enhanced expression of Na+/K + ATPase α-subunit relative to other genes. © 2007 Springer-Verlag. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 177, Número 3, Pags. 361-374 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Adenosine Triphosphatase (potassium Sodium) | en |
dc.subject | Adenosine Triphosphate | en |
dc.subject | Creatine | en |
dc.subject | Creatine Phosphate | en |
dc.subject | Glycogen | en |
dc.subject | Hemoglobin | en |
dc.subject | Ion | en |
dc.subject | Lactate Dehydrogenase | en |
dc.subject | Lactic Acid | en |
dc.subject | Rna, Messenger | en |
dc.subject | Oxygen | en |
dc.subject | Pyruvate Dehydrogenase Complex | en |
dc.subject | Pyruvic Acid | en |
dc.subject | Adaptation | en |
dc.subject | Animals | en |
dc.subject | Anoxia | en |
dc.subject | Blood | en |
dc.subject | Cichlid | en |
dc.subject | Enzymology | en |
dc.subject | Fast Muscle Fiber | en |
dc.subject | Genetics | en |
dc.subject | Gill | en |
dc.subject | Glucose Blood Level | en |
dc.subject | Hematocrit | en |
dc.subject | Kidney | en |
dc.subject | Liver | en |
dc.subject | Mean Corpuscular Volume | en |
dc.subject | Metabolism | en |
dc.subject | Pathophysiology | en |
dc.subject | Ph | en |
dc.subject | Physiology | en |
dc.subject | Adaptation, Physiological | en |
dc.subject | Adenosine Triphosphate | en |
dc.subject | Animal | en |
dc.subject | Anoxia | en |
dc.subject | Blood Glucose | en |
dc.subject | Cichlids | en |
dc.subject | Creatine | en |
dc.subject | Erythrocyte Indices | en |
dc.subject | Gills | en |
dc.subject | Glycogen | en |
dc.subject | Hematocrit | en |
dc.subject | Hemoglobins | en |
dc.subject | Hydrogen-ion Concentration | en |
dc.subject | Ions | en |
dc.subject | Kidney | en |
dc.subject | L-lactate Dehydrogenase | en |
dc.subject | Lactic Acid | en |
dc.subject | Liver | en |
dc.subject | Muscle Fibers, Fast-twitch | en |
dc.subject | Oxygen | en |
dc.subject | Phosphocreatine | en |
dc.subject | Pyruvate Dehydrogenase Complex | en |
dc.subject | Pyruvic Acid | en |
dc.subject | Rna, Messenger | en |
dc.subject | Sodium-potassium-exchanging Atpase | en |
dc.subject | Astronotus Ocellatus | en |
dc.subject | Cichlidae | en |
dc.title | Metabolic and ionoregulatory responses of the Amazonian cichlid, Astronotus ocellatus, to severe hypoxia | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1007/s00360-006-0135-2 | - |
dc.publisher.journal | Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology | pt_BR |
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