title: The effect of cyclic nucleotides and icosanoids on Na+ and K+ transport in human red cells.
abstract: Cyclic AMP inhibits the bumetanide-sensitive Na+,K+ cotransport system in human red cells. The cotransport inhibition is enhanced by addition of phosphodiesterase inhibitor 1-methyl-3-isobutylxanthine to the incubation medium. The cyclic AMP concentration giving half-maximal cotransport inhibition showed a wide variation among different individuals (from 0.1 to 5 mM external cyclic AMP concentration). In contrast to cyclic AMP, cyclic GMP showed little effect on the cotransport system. The ouabain-sensitive Na+,K+ pump was almost unaffected by cyclic nucleotides. Prostacyclin was the only tested prostaglandin showing an effect on Na+ and K+ transport in human red cells. In some individuals, this icosanoid stimulated the Na+,K+ cotransport system. Leukotriene B4 stimulated K+ fluxes.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D001693:Biological Transport, Active / Q000187:drug effects; D002034:Bumetanide / Q000494:pharmacology; D000242:Cyclic AMP / Q000494:pharmacology*; D006152:Cyclic GMP / Q000494:pharmacology*; D004912:Erythrocytes / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D010042:Ouabain / Q000494:pharmacology; D011188:Potassium / Q000097:blood*; D011453:Prostaglandins / Q000494:pharmacology*; D012964:Sodium / Q000097:blood*; D000254:Sodium-Potassium-Exchanging ATPase / Q000097:blood*
chemical_list: D011453:Prostaglandins; D002034:Bumetanide; D010042:Ouabain; D012964:Sodium; D000242:Cyclic AMP; D000254:Sodium-Potassium-Exchanging ATPase; D006152:Cyclic GMP; D011188:Potassium; D015056:1-Methyl-3-isobutylxanthine