Summary
The effect of the loop diuretic furosemide (4-chloro-N-furfuryl-5-sulfamoyl-anthranilic acid) on the thiol-dependent, ouabain-insensitive K(Rb)/Cl transport in low K+ sheep red cells was studied at various concentrations of extracellular Rb+, Na+ and Cl−. In Rb+-free NaCl media, 2×10−3 m furosemide inhibited only one-half of thiol-dependent K+ efflux. In the presence of 23mm RbCl, however, the concentration of furosemide to produce 50% K+ efflux inhibition (IC50) was 5×10−5 m. In Rb+ containing NaCl media, the inhibitory effect of 10−3 m furosemide was equal to that caused by NO −3 replacement of Cl− in the medium. The apparent synergistic action of furosemide and external Rb+ on K+ efflux was also seen in the ouabain-insensitive Rb+ influx. A preliminary kinetic analysis suggests that furosemide binding alters both maximal K+(Rb+) transport and apparent external Rb+ affinity. In the presence of external Rb+, Na+ (as compared to choline) exerted a small but significant augmentation of the furosemide inhibition of K+(Rb+) fluxes. There was no effect of Cl− on the IC50 value of furosemide. As there is no evidence for coupled Na+K+ cotransport in low K+ sheep red cells, furosemide may modify thiol-dependent K+(Rb+/Cl flux or Rb+ (and to a slight degree Na+) modulate the effect of furosemide.
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Lauf, P.K. Thiol-Dependent passive K/Cl transport in sheep red cells: IV. Furosemide inhibition as a function of external Rb+, Na+, and Cl− . J. Membrain Biol. 77, 57–62 (1984). https://doi.org/10.1007/BF01871100
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DOI: https://doi.org/10.1007/BF01871100