Summary
Li+ net-transfer across cell membranes was studied on human erythrocytes and ghosts preloaded with 1–2 mM Li+ and incubated in saline media of varying composition at initial thermodynamic equilibrium for Li+. The following results were obtained:
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1.
Li+ is extruded from glycolyzing erythrocytes against an electrochemical gradient until a steadystate Li+ distribution is established after 24–28 h.
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2.
The initial rate of Li+ extrusion is not altered by ouabain or by reduction of ATP levels to less than 25% of the normal value.
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3.
Replacement of external Na+ by K+ or choline+ abolishes the establishment of an electrochemical Li+ gradient.
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4.
The Li+ distribution ratio Li +e /Li +i increases proportional to the ratio Na +e /Na +i at constant extracellular K+ concentrations.
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5.
In ghost suspension an uphill Li+ transport is driven by an oppositely directed Na+ gradient. The direction of the Li+ uphill transport can be reversed by reversing the Na+ gradient.
From the results it is concluded that the Li+ uphill transport across human red cell membranes is mediated by a Na+-dependent Li+ counter-transport system. This system is not inhibited by ouabain and does not appear to be identical to the Na+−Na+ exchange system described by Garrahan and Glynn [24].
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Duhm, J., Eisenried, F., Becker, B.F. et al. Studies on the lithium transport across the red cell membrane. Pflugers Arch. 364, 147–155 (1976). https://doi.org/10.1007/BF00585183
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DOI: https://doi.org/10.1007/BF00585183