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Characteristics of the volume- and chloride-dependent K transport in human erythrocytes homozygous for hemoglobin C

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Summary

In human red cells homozygous for hemoglobin C (CC), cell swelling and acid pH increase K efflux and net K loss in the presence of ouabain (0.1mm) and bumetanide. We report herein, that K influx is also dependent on cell volume in CC cells: cell swelling induces a marked increase in the maximal rate (from 6 to 18 mmol/liter cell × hr) and in the affinity for external K (from 77±16mm to 28±3mm) of K influx. When the external K concentration is varied from 0 to 140mm, K efflux from CC and normal control cells is unaffected. Thus, K/K exchange is not a major component of this K movement. K transport through the pathway of CC cells is dependent on the presence of chloride or bromide; substitution with nitrate, acetate or thiocyanate inhibits the volume- and pH-dependent K efflux. When CC cells are separated according to density, a sizable volume-dependent component of K efflux can be identified in all the fractions and is the most active in the least dense fraction. N-ethylmaleimide (NEM) markedly stimulates K efflux from CC cells in chloride but not in nitrate media, and this effect is present in all the fractions of CC cells separated according to density. The persistence of this transport system in denser CC cells suggests that not only cell age, but also the presence of the positively charged C hemoglobin is an important determinant of the activity of this system. These data also indicate that the K transport pathway of CC cells is not an electrodiffusional process and is coupled to chloride.

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  1. Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, 02115, Boston, Massachusetts

    Carlo Brugnara

  2. Department of Cellular and Molecular Physiology, Harvard Medical School, 02115, Boston, Massachusetts

    Carlo Brugnara

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Brugnara, C. Characteristics of the volume- and chloride-dependent K transport in human erythrocytes homozygous for hemoglobin C. J. Membrain Biol. 111, 69–81 (1989). https://doi.org/10.1007/BF01869210

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  • DOI: https://doi.org/10.1007/BF01869210

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