Abstract
Na+/K+-ATPase (sodium, potassium adenosine triphosphatase, EC 3.6.3.9) activity has been studied in whole erythrocytes from rats over time of total food deprivation for 1, 3, 5, 7–8, and 10–12 days with free access to water. Changes in Na+/K+-ATPase activity have been found to be phase-specific, i.e., associated with periods of certain metabolism level. After the hunger state and accommodation to endogenous nutrition (phases 0-I), from the 3rd to the 7th–8th day a period of compensated accommodation begins (phase II characterized by a stable euglycemic state, while the level of plateau of protein losses and hormonal stimulation are achieved). The Na+/K+-ATPase activity changes during the phase II were insignificant (p > 0.05), but potassium loss was observed in erythrocytes and blood plasma from the 5th day of starvation onwards. The phase III (the 10th–12th days) is an onset of the terminal period characterized by the lower activities of Na+/K+-ATPase (ouabain-sensitive activity) and Mg2+-ATPase (ouabain-independent activity) and by reduced sodium plasma levels that previously had remained virtually unchanged. There are considered possible causes of the observed decrease in the Na+/K+-ATPase activity during prolonged starvation, such as aging of the circulating erythrocyte population (the absence of reticulocytes and young erythrocytes), depletion of cell energy resources (hypoglycemia and glycopenia), effect of endogenous ouabain, and endotoxemia.
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Original Russian Text © E.A. Skverchinskaya, T.V. Tavrovskaya, A.V. Novozhilov, 2013, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2013, Vol. 49, No. 2, pp. 144–152.
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Skverchinskaya, E.A., Tavrovskaya, T.V. & Novozhilov, A.V. Na+/K+-ATPase activity in rat erythrocytes after prolonged starvation. J Evol Biochem Phys 49, 183–192 (2013). https://doi.org/10.1134/S0022093013020072
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DOI: https://doi.org/10.1134/S0022093013020072