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Titolo:
VOLUME-DEPENDENT AND CATECHOLAMINE-DEPENDENT REGULATION OF NA H ANTIPORTER AND UNIDIRECTIONAL POTASSIUM FLUXES IN SALMO-TRUTTA RED-BLOOD-CELLS/
Autore:
ORLOV SN; CRAGOE EJ; HANNINEN O;
Indirizzi:
UNIV KUOPIO,DEPT PHYSIOL,POB 1627 SF-70211 KUOPIO FINLAND UNIV KUOPIO,DEPT PHYSIOL SF-70211 KUOPIO FINLAND MOSCOW MV LOMONOSOV STATE UNIV,SCH BIOL,PHYS CHEM BIOMEMBRANES LAB MOSCOW 119899 RUSSIA
Titolo Testata:
Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology
fascicolo: 2, volume: 164, anno: 1994,
pagine: 135 - 140
SICI:
0174-1578(1994)164:2<135:VACRON>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SODIUM-HYDROGEN EXCHANGE; RAINBOW-TROUT; ION-TRANSPORT; ADRENERGIC RESPONSES; RAT ERYTHROCYTES; CARP; GAIRDNERI; SYSTEM; PH;
Keywords:
NA, K-PUMP; NA/H EXCHANGE; CATECHOLAMINES; CELL VOLUME; FISH ERYTHROCYTES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
S.N. Orlov et al., "VOLUME-DEPENDENT AND CATECHOLAMINE-DEPENDENT REGULATION OF NA H ANTIPORTER AND UNIDIRECTIONAL POTASSIUM FLUXES IN SALMO-TRUTTA RED-BLOOD-CELLS/", Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 164(2), 1994, pp. 135-140

Abstract

beta-Adrenergic- and volume-dependent regulation of Na-22 influx and Rb-86 influx and efflux in erythrocytes of brown trout (Salmo trutta m. lacustris) were studied. Norepinephrine (10(-6) mol.1(-1)) increasedthe rate of Na-22 influx 10- to 20-fold via the activation of a Na/H exchanger (ethyl isopropyl amiloride inhibited component of Na-22 influx). Unlike carp erythrocytes the activity of the Na, K-pump (ouabain-inhibited Rb-86 influx) was only slightly (25-35%) increased by norepinephrine. The norepinephrine-induced increment of Na, K-pump activity was completely abolished by ethyl isopropyl amiloride thus indicating that this effect was mediated by Na/H exchanger-induced increase of intracellular Na+ concentration. Cell shrinkage in hyperosmotic media resulted in a several-fold activation of the Na/H exchanger. Cell swelling in hypotonic media increased both the rate of K, Cl-cotransport [((dihydroindenyl)oxy)alcanaic acid-sensitive components of Rb-86 influxeand efflux] and passive permeability (leakage) of erythrocyte membranes for Na+ and K+. No volume-dependent regulation of Na, K, 2Cl-cotransport (bumetanide-sensitive components of Rb-86 fluxes) was found. It may be concluded that the regulation of monovalent cation transport inerythrocytes of fast-moving (carnivorous) brown trout differs essentially from that in slowly moving (herbivorous) carp.

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Documento generato il 24/09/20 alle ore 11:26:38