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- Title
Preferential intracellular pH regulation represents a general pattern of pH homeostasis during acid-base disturbances in the armoured catfish, Pterygoplichthys pardalis.
- Authors
Harter, T.; Shartau, R.; Baker, D.; Jackson, D.; Val, A.; Brauner, C.
- Abstract
Preferential intracellular pH (pH) regulation, where pH is tightly regulated in the face of a blood acidosis, has been observed in a few species of fish, but only during elevated blood PCO. To determine whether preferential pH 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, pH of red blood cells (RBC), brain, heart, liver and white muscle, and plasma lactate and total CO were measured. All treatments resulted in significant changes in extracellular pH and RBC pH 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, pH remained tightly regulated and did not differ significantly from control values, with the exception of a decrease in white muscle pH after anoxia and an increase in liver pH following a metabolic alkalosis. Thus preferential pH regulation appears to be a general pattern for acid-base homeostasis in the armoured catfish and may be a common response in Amazonian fishes.
- Subjects
HYDROGEN-ion concentration; HOMEOSTASIS; ACID-base imbalances; CATFISHES; ACIDOSIS; PHYSIOLOGY
- Publication
Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology, 2014, Vol 184, Issue 6, p709
- ISSN
0174-1578
- Publication type
Article
- DOI
10.1007/s00360-014-0838-8