Modulation of Na+/K+ pump in intact erythrocytes by cardioglycosides, steroid hormones and ouabain-like compounds.
Gen Pharmacol
; 23(4): 683-7, 1992 Jul.
Article
em En
| MEDLINE
| ID: mdl-1327947
ABSTRACT
1. Pure erythrocytes preparations, free from platelets and white cells, were incubated for a long time without hemolysis. 2. Dose-response experiments performed with (a) cardioglycosides (ouabain and K-strophantoside), (b) steroid hormones and their glucuronides (tetrahydrocortisol, oestradiol and the respective 3-glucuronic derivatives) and (c) ouabain-like compounds purified in our laboratory (0.7 kDa and 2-4 kDa respectively) emphasise a modulatory effect [activation of Na+ efflux rate and K+ uptake at very low ligand concentrations, inhibition at higher levels; maximum enhancement of cation transport (a) and (b) 10-0.1 nM (+40-50%), (c) 1-0.01 nM (2.5-fold)]. 3. Binding experiments show upward-curved Scatchard graphs, with the Kd values of 50 nM and 18 microM and the Bmax values of 10.2 and 984.5 fmol/100 microliters RBC (red blood cells) respectively.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ouabaína
/
Esteroides
/
Glicosídeos Cardíacos
/
ATPase Trocadora de Sódio-Potássio
/
Eritrócitos
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Gen Pharmacol
Ano de publicação:
1992
Tipo de documento:
Article