Ozawa Y, Sato S, Matsumoto K, Nishi S, Shishido S, Imafuku Y, Miura Y, Yoshida H. Determination of potassium flux activity of viable human erythrocytes by measuring the release-influx ratio.
Clin Chim Acta 1999;
279:125-32. [PMID:
10064124 DOI:
10.1016/s0009-8981(98)00175-2]
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Abstract
A simple and convenient method to determine the K+-flux activity of viable human erythrocytes was developed. Erythrocyte suspensions were incubated at 4 degrees C for 24 h to induce K+-release (deltaKr) and then at 37 degrees C for 3 h to influx K+ into erythrocytes (deltaKi). A straight-line relationship between K+ release-influx ratio and ouabain-induced K+-efflux from erythrocytes indicated that deltaKi/deltaKr ratio or the K+-flux activity was reflected predominantly by Na+/K+-exchanging ATPase activity. Using this method, K+-flux activity of erythrocytes in the young and the aged subjects was measured. The mean deltaKi/deltaKr ratio of the aged subjects was decreased significantly. This method of measuring deltaKi/deltaKr ratio is useful for the evaluation of K+-flux activity of viable erythrocytes.
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