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Título: | Preferential intracellular pH regulation represents a general pattern of pH homeostasis during acid-base disturbances in the armoured catfish, Pterygoplichthys pardalis |
Autor: | Harter, Till S. Shartau, Ryan B. Baker, Daniel W. Jackson, Donald C. Val, Adalberto Luis Brauner, Colin John |
Palavras-chave: | Liposarcus Pardalis Pisces Bicarbonate Carbon Dioxide Acid Base Balance Acidosis Animals Catfish Cell Hypoxia Exercise Hematocrit Homeostasis Liver Metabolism Ph Physiology Muscle, Skeletal Acid-base Equilibrium Acidosis Animal Bicarbonates Carbon Dioxide Catfishes Cell Hypoxia Hematocrit Homeostasis Hydrogen-ion Concentration Liver Muscle, Skeletal Physical Exertion |
Data do documento: | 2014 |
Revista: | Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology |
É parte de: | Volume 184, Número 6, Pags. 709-718 |
Abstract: | Preferential intracellular pH (pHi) regulation, where pHi is tightly regulated in the face of a blood acidosis, has been observed in a few species of fish, but only during elevated blood PCO2. To determine whether preferential pHi regulation may represent a general pattern for acid-base regulation during other pH disturbances we challenged the armoured catfish, Pterygoplichthys pardalis, with anoxia and exhaustive exercise, to induce a metabolic acidosis, and bicarbonate injections to induce a metabolic alkalosis. Fish were terminally sampled 2-3 h following the respective treatments and extracellular blood pH, pHi of red blood cells (RBC), brain, heart, liver and white muscle, and plasma lactate and total CO2 were measured. All treatments resulted in significant changes in extracellular pH and RBC pHi that likely cover a large portion of the pH tolerance limits of this species (pH 7.15-7.86). In all tissues other than RBC, pHi remained tightly regulated and did not differ significantly from control values, with the exception of a decrease in white muscle pHi after anoxia and an increase in liver pHi following a metabolic alkalosis. Thus preferential pHi regulation appears to be a general pattern for acid-base homeostasis in the armoured catfish and may be a common response in Amazonian fishes. © 2014 Springer-Verlag Berlin Heidelberg. |
DOI: | 10.1007/s00360-014-0838-8 |
Aparece nas coleções: | Artigos |
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