The Journal of Membrane Biology

, Volume 98, Issue 2, pp 117–124 | Cite as

Effect of membrane potential on furosemide-inhibitable sodium influxes in human red blood cells

  • George R. Kracke
  • Philip B. Dunham


Furosemide-inhibitable Na influx (a measure of Na/K/Cl cotransport) was determined as a function of membrane potential in human red blood cells. The membrane potential was varied from −42 to +118 mV using valinomycin and gradients of K. The furosemide-inhibitable, unidirectional Na influx was independent of membrane potential over the entire range of potentials. The change in flux per mV, 0.443 μmol/(liter cells·hr· mV), was not significantly different from zero. The mean flux was 153±16μmol/(liter cells·hr) (±sem,n=71). The ouabain and furosemide-resistant influexes of Na and K were also measured as functions of membrane potential using either valinomycin and K or a chloride-free, tartrate flux medium to vary membrane potential. The unidirectional Na influx decreased slightly as the membrane potential was increased from negative potentials to about +10 mV. At higher membrane potentials Na influx rose dramatically with potential. This increase was not reversible and was also observed with K influx.

Key Words

Na/K/Cl cotransport furosemide valinomycin erythrocytes DIDS 


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Copyright information

© Springer-Verlag New York Inc. 1987

Authors and Affiliations

  • George R. Kracke
    • 1
  • Philip B. Dunham
    • 1
  1. 1.Department of BiologySyracuse UniversitySyracuse

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