title: Na+-independent Mg2+ efflux from Mg2+-loaded human erythrocytes.
abstract: Net Mg2+ efflux from Mg2+-loaded human erythrocytes was maximal after reincubation in sucrose. Net Mg2+ efflux was not inhibited by furosemide or bumetanide and, therefore, was not performed by the (Na,K,Cl)- or (K,Cl)-cotransport system. A component of net Mg2+ efflux was inhibited by extracellular NaC1, KCl, LiCl, choline Cl and SITS, in analogy to the inhibition of net Cl- and SITS. Therefore, it was concluded that net Mg2+ efflux is dependent on net Cl- efflux for charge compensation. Cl- -dependent net Mg2+ efflux was inhibited by amiloride. Only 10% of the maximal net Mg2+ efflux may depend on extracellular Na+.
authors.affiliation: Institute of Molecular Biology and Biochemistry, Free University of Berlin, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Günther
authors.forename: J
authors.initials: J
authors.lastname: Vormann
mesh_terms: D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D001692:Biological Transport / Q000187:drug effects; D002712:Chlorides / Q000097:blood / Q000494:pharmacology; D002794:Choline / Q000494:pharmacology; D004912:Erythrocytes / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D008094:Lithium / Q000494:pharmacology; D018021:Lithium Chloride; D008274:Magnesium / Q000097:blood*; D011188:Potassium / Q000097:blood; D011189:Potassium Chloride / Q000494:pharmacology; D012964:Sodium / Q000494:pharmacology*; D012965:Sodium Chloride / Q000494:pharmacology; D013395:Sucrose / Q000494:pharmacology
chemical_list: D002712:Chlorides; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; D012965:Sodium Chloride; D013395:Sucrose; D011189:Potassium Chloride; D008094:Lithium; D012964:Sodium; D018021:Lithium Chloride; D008274:Magnesium; D002794:Choline; D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid; D011188:Potassium