Species‐specific Mn2+/Mg2+ antiport from Mg2+‐loaded erythrocytes

Abstract
Mg2+‐loaded rat erythrocytes performed Mn+/Mg2+ antiport, which was nonspecifically stimulated by anions and cations. Mn2+/Mg2+ antiport was shown to operate via the Na+Mg2+ antiporter because extracellular Na+ and Mn2+ inhibited the intracellular uptake of each other's ions competitively. Furthermore, Mn2+/Mg2+ antiport and Na+/Mg2+ antiport were identically inhibited by various amiloride derivatives. Na+/Mg2+ antiport of chicken and human erythrocytes cannot perform Mn2+/Mg2+ antiport although chicken erythrocytes took up more Mn2+ than raterythrocytes.

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