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Na/sup +/:K/sup +/- and HCO/sub 3//sup -/-stimulated ATPase activities in the gills and kidneys of thermally acclimated rainbow trout, Salmo gairdneri

Journal Article · · Can. J. Zool.; (United States)
DOI:https://doi.org/10.1139/z77-092· OSTI ID:7312036
;
Gill and kidney Mg/sup 2 +/-dependent, Na/sup +/:K/sup +/- and HCO/sub 3//sup -/-stimulated ATPase (EC 3.6.1.3) activities were estimated at 25/sup 0/C and at acclimation temperature in rainbow trout, Salmo gairdneri, acclimated to 2, 10, and 18/sup 0/C, as were plasma levels of sodium, potassium, and chloride. Sodium and chloride exhibited no significant variation between 2 and 18/sup 0/C; potassium levels were elevated at 18/sup 0/C. When assayed at 25/sup 0/C Mg/sup 2 +/-dependent and HCO/sub 3//sup -/-stimulated ATPase activities did not vary consistently or significantly in relation to acclimation temperature. Under comparable assay conditions both gill and kidney Na/sup +/:K/sup +/-stimulated activities declined at higher acclimation temperatures. Significant increases in all activities were encountered when preparations were incubated at the appropriate acclimation temperature. The data suggest that the branchial Na/sup +/:K/sup +/--ATPase system serves primarily as a high-temperature amplifier of sodium uptake, and may contribute little to the maintenance of sodium balance in the cold-adapted animal. No evidence of a critical involvement of HCO/sub 3//sup -/-stimulated ATPase in ionic regulations was obtained.
Research Organization:
Brock Univ., St. Catharines, Ont.
OSTI ID:
7312036
Journal Information:
Can. J. Zool.; (United States), Journal Name: Can. J. Zool.; (United States) Vol. 55:4; ISSN CJZOA
Country of Publication:
United States
Language:
English

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Related Subjects

550200 -- Biochemistry
560205* -- Thermal Effects-- Vertebrates-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKALI METALS
ALKALINE EARTH METALS
ANIMALS
AQUATIC ORGANISMS
ATP-ASE
BIOLOGICAL ADAPTATION
BODY
CARBON COMPOUNDS
CARBONATES
CATALYSIS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
ELEMENTS
ENZYMES
ESTERASES
FISHES
GILLS
HALIDES
HALOGEN COMPOUNDS
HYDROLASES
IONS
KIDNEYS
MAGNESIUM
METABOLISM
METALS
ORGANS
OXYGEN COMPOUNDS
PHOSPHATASES
POTASSIUM
RESPIRATORY SYSTEM
SODIUM
TEMPERATURE EFFECTS
TROUT
VERTEBRATES