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Titolo:
BRANCHIAL AND RENAL CALCIUM FLUXES IN RAINBOW-TROUT (ONCORHYNCHUS-MYKISS) DURING METABOLIC ALKALOSIS
Autore:
MACKENZIE WM; PERRY SF;
Indirizzi:
UNIV OTTAWA,DEPT BIOL,30 MARIE CURIE OTTAWA ON K1N 6N5 CANADA UNIV OTTAWA,DEPT BIOL OTTAWA ON K1N 6N5 CANADA
Titolo Testata:
Comparative biochemistry and physiology. Section A: Comparative physiology
fascicolo: 3, volume: 118, anno: 1997,
pagine: 637 - 645
SICI:
1095-6433(1997)118:3<637:BARCFI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACID-BASE REGULATION; BULLHEAD ICTALURUS-NEBULOSUS; FRESH-WATER TELEOSTS; CL UPTAKE KINETICS; SALMO-GAIRDNERI; CHLORIDE CELL; ENVIRONMENTAL HYPERCAPNIA; OREOCHROMIS-MOSSAMBICUS; DIFFUSIVE EFFLUXES; ANGUILLA-ROSTRATA;
Keywords:
ALKALOSIS; ACID-BASE DISTURBANCE; CA2+ TRANSPORT; CA2+-ATPASE; CHLORIDE CELL; FISH; GILL; IONO-REGULATION; NA+,K+-ATPASE; RAINBOW TROUT (ONCORHYNCHUS MYKISS);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
W.M. Mackenzie e S.F. Perry, "BRANCHIAL AND RENAL CALCIUM FLUXES IN RAINBOW-TROUT (ONCORHYNCHUS-MYKISS) DURING METABOLIC ALKALOSIS", Comparative biochemistry and physiology. Section A: Comparative physiology, 118(3), 1997, pp. 637-645

Abstract

Rainbow trout (Oncorhynchus mykiss) were infused with NaHCO3, inducing a metabolic alkalosis, and renal and branchial Ca2+ fluxes were monitored. Because such treatment is known to alter gill epithelial morphology by increasing exposed chloride cell surface area, it was hypothesized that Ca2+ uptake would be increased in these fish. Whole body Ca2 influx was significantly increased after 6 hr of NaHCO3 infusion andremained elevated throughout the duration of the experiment. Branchial and renal Ca2+ effluxes were largely unaffected by NaHCO3 infusion. Plasma total Ca2+ concentrations were significantly decreased after 6 hr of NaHCO3 infusion and remained so until 48 hr. Such results suggest relocation of Ca2+ from the plasma to other body compartments, such as bone. Analysis of the kinetics of whole body Ca2+ uptake revealed that infusion of NaHCO3 for 48 hr caused a significant increase in the maximal uptake rate of Ca2+; the affinity constant of Ca2+ uptake was unchanged. Measurement of various enzymatic activities from gill basolateral membranes revealed that although Na+,K+-ATPase activity was significantly increased in NaHCO3-infused fish, neither Ca2+-ATPase activity nor ATP-dependent Ca2+ transport was affected. These findings suggest that the basolateral membrane Ca2+ transporter does not alter its capacity to move Ca2+ under alkalotic conditions. We suggest that the chloride cell apical membrane is the principle regulator of branchial Ca2+ uptake in rainbow trout under alkalotic conditions. Such a suggestion concurs with the original hypothesis that an increase in apical surface area would lead to increased Ca2+ uptake. (C) 1997 Elsevier Science Inc.

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Documento generato il 24/11/20 alle ore 11:23:55