Species-dependent differences in the effect of ionic strength on potassium transport of erythrocytes: the role of lipid composition.

The Rb+(K+) efflux of erythrocytes from six mammalian species was investigated in solutions of physiological and low ionic strength. A species dependent increase of the Rb+(K+) efflux in low ionic strength solution could be observed. The rate constant of Rb+(K+) efflux of erythrocytes in physiological ionic strength solution correlates with the content of arachidonic acid of the membrane phospholipids. The same relation was observed in solution of low ionic strength with the exception of human erythrocytes. In addition, an age-dependent correlation of the rate constant of Rb+(K+) efflux from calf erythrocytes in low ionic strength solution with the content of arachidonic acid of the membrane phospholipids was found. The Rb+(K+) efflux of human erythrocytes, which is enhanced in low ionic strength solution, decreases with the decreasing temperature. The temperature-dependent ESR order parameter of a fatty acid spin label for human and cow erythrocytes in solution of physiological and low ionic strength media suggested that the effect of low ionic strength on Rb+(K+) efflux is not solely based on a change of membrane fluidity. The results are interpreted as being due to a specific influence of membrane phospholipids on the Rb+(K+) efflux.

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