Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18765
Title: Carbohydrate management, anaerobic metabolism, and adenosine levels in the armoured catfish, Liposarcus pardalis (Castelnau), during hypoxia
Authors: MacCormack, Tyson James
Lewis, Johanne Mari
Almeida-Val, Vera Maria Fonseca
Val, Adalberto Luis
Driedzic, William Robert
Keywords: Adenosine
Calcium
Glucose
Hydrocortisone
Lactic Acid Derivative
Oxygen
Acidosis
Anaerobic Growth
Animals
Anoxia
Blood
Brain
Breathing
Carbohydrate Metabolism
Catfish
Chemistry
Energy Metabolism
Gill
Glucose Blood Level
Glycogen Liver Level
Heart Muscle
Metabolism
Muscle
Phosphorylation
Physiology
Temperature
Acidosis
Adenosine
Anaerobiosis
Animal
Anoxia
Blood Glucose
Brain
Calcium
Carbohydrate Metabolism
Catfishes
Energy Metabolism
Gills
Glucose
Hydrocortisone
Lactates
Liver Glycogen
Muscles
Myocardium
Oxygen
Phosphorylation
Respiration
Temperature
Callichthys Callichthys
Liposarcus Pardalis
Issue Date: 2006
metadata.dc.publisher.journal: Journal of Experimental Zoology Part A: Comparative Experimental Biology
metadata.dc.relation.ispartof: Volume 305, Número 4, Pags. 363-375
Abstract: The armoured catfish, Liposarcus pardalis, tolerates severe hypoxia at high temperatures. Although this species can breathe air, it also has a strong anaerobic metabolism. We assessed tissue to plasma glucose ratios and glycogen and lactate in a number of tissues under "natural" pond hypoxia, and severe aquarium hypoxia without aerial respiration. Armour lactate content and adenosine in brain and heart were also investigated. During normoxia, tissue to plasma glucose ratios in gill, brain, and heart were close to one. Hypoxia increased plasma glucose and decreased tissue to plasma ratios to less than one, suggesting glucose phosphorylation is activated more than uptake. High normoxic white muscle glucose relative to plasma suggests gluconeogenesis or active glucose uptake. Excess muscle glucose may serve as a metabolic reserve since hypoxia decreased muscle to plasma glucose ratios. Mild pond hypoxia changed glucose management in the absence of lactate accumulation. Lactate was elevated in all tissues except armour following aquarium hypoxia; however, confinement in aquaria increased armour lactate, even under normoxia. A stress-associated acidosis may contribute to armour lactate sequestration. High plasma lactate levels were associated with brain adenosine accumulation. An increase in heart adenosine was triggered by confinement in aquaria, although not by hypoxia alone. © 2006 Wiley-Liss, Inc.
metadata.dc.identifier.doi: 10.1002/jez.a.274
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