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Am J Physiol Cell Physiol 253: C7-C12, 1987;
0363-6143/87 $5.00
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AJP - Cell Physiology, Vol 253, Issue 1 C7-12, Copyright © 1987 by American Physiological Society

ARTICLES

Effect of N-ethylmaleimide on K transport in density-separated human red blood cells

L. R. Berkowitz, D. Walstad and E. P. Orringer

N-ethylmaleimide (NEM) is a sulfhydryl-reacting agent known to stimulate chloride-dependent K transport in a variety of red cells. In high K sheep red cells, NEM-induced K movements are greater in magnitude in young cells compared with old cells. We hypothesized that human red cells might respond to NEM like high K sheep red cells. To test this idea, cells of various age were exposed to 0.5 mM NEM. We found that, after a 4-h incubation, young cells lost 50% of cell K, compared with 10% K loss in older cells. K loss in all fractions was inhibited by chloride replacement or furosemide.


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I. Bize, S. Taher, and C. Brugnara
Regulation of K-Cl cotransport during reticulocyte maturation and erythrocyte aging in normal and sickle erythrocytes
Am J Physiol Cell Physiol, July 1, 2003; 285(1): C31 - C38.
[Abstract] [Full Text] [PDF]


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