Abstract

Ca 2+-dependent K + transport and plasma membrane NADH dehydrogenase activities have been studied in several ‘high-K +’ (human, rabbit and guinea pig) and ‘low-K +’ (dog, cat and sheep) erythrocytes. All the species except sheep showed Ca 2+-dependent K + transport. NADH-ferricyanide reductase was detected in all the species and showed positive correlation with the flavin contents of the membranes. NADH-cytochrome c reductase was very low or absent in dog, sheep and guinea pig membranes. No correlation was found between NADH dehydrogenase and Ca 2+-dependent K + channel activities in the species studied. Nor were any of the above activities correlated with ( Na + + K +)- ATPase activity.

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