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The effect of cetiedil on red cell membrane permeability.

We report the effects of cetiedil, a new antisickling agent, on red cell membrane permeability. With fresh red cells containing normal levels of intracellular ATP, cetiedil increases membrane permeability to both sodium and potassium. With drug concentrations from 100 to 500 microM, net sodium gain exceeds net potassium loss, and the cells quickly swell. Changes are identical with normal and sickle red cells. Membrane permeability returns to normal after washing the cells in buffer free of cetiedil. In the absence of phosphate, ouabain potentiates the cetiedil effect. With external phosphate present, the effect of cetiedil is also enhanced, but ouabain is without effect. Our findings support the idea that the antisickling effect of cetiedil observed in vitro is secondary to cell swelling.