title: Intracellular Ca(2+)-Mg2+ interactions.
abstract: To ascertain possible interactions of intracellular Mg2+ and Ca2+, the concentration of intracellular free Ca2+ ([Ca2+]i) and intracellular free Mg2+ ([Mg2+]i) were experimentally increased within physiological ranges and it was measured by means of fura-2 and mag-fura-2 whether the increased concentration of one divalent cation affected the concentration of the other. A four-fold increase of [Ca2+]i in rat thymocytes by concanavalin A or thapsigargin had no significant effect on [Mg2+]i. Incubation of rat thymocytes in Na(+)-free medium increased [Mg2+]i from 0.35 to 0.7 mM. This increase in [Mg2+]i did not affect [Ca2+]i or the action of thapsigargin on [Ca2+]i.
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: D000584:Amiloride / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism* / Q000494:pharmacology; D003208:Concanavalin A / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D017136:Ion Transport / Q000187:drug effects / Q000502:physiology; D008274:Magnesium / Q000378:metabolism* / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D012965:Sodium Chloride / Q000494:pharmacology; D013601:T-Lymphocytes / Q000378:metabolism*; D013729:Terpenes / Q000494:pharmacology; D019284:Thapsigargin
chemical_list: D013729:Terpenes; D003208:Concanavalin A; D012965:Sodium Chloride; D019284:Thapsigargin; D000584:Amiloride; D008274:Magnesium; D002118:Calcium