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Cation distribution in mammalian red blood cells: interspecies and intraspecies relationships between cellular ATP, potassium, sodium and magnesium concentrations.

The intracellular K+/Na+ ratio of erythrocytes of different mammalian species are known to differ markedly. These differences are sustained despite plasma potassium and sodium concentrations being almost identical, i.e. high [Na+] and low [K+], in all mammalian species. Conventional cell theory couples intracellular K+ and Na+ concentrations with Na+/K(+)-dependent ATPase activity. Ling's Association-Induction (AI) hypothesis couples intracellular K+ and Na+ concentrations with the concentration of ATP, by way of an inductive adsorption of both monovalent cations on the available terminal and lateral carboxyl groups of proteins. Based on the working hypothesis, different relationships are expected between the erythrocyte K+ and Na+ concentrations and ATP levels. Our results indicate that the intracellular ATP level in erythrocytes of different species corresponds with intracellular K+ and Na+ levels, K+/Na+ ratios and total K+ + Na+ levels. Similar relationships were revealed between the erythrocyte ATP and monovalent cation contents of different individual sheep.