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The program of Friend cell erythroid differentiation: early changes in Na+/K+ ATPase function.
Journal of Supramolecular Structure
|January 1, 1978
Summary
Chemical agents that induce Friend cell differentiation, like DMSO, decrease sodium-potassium adenosine triphosphatase (Na+/K+-ATPase) activity. This early change in ion influx correlates with hemoglobin synthesis, suggesting the enzyme
Area of Science:
- Cell Biology
- Biochemistry
- Hematology
Background:
- Friend erythroleukemia cells are a model for studying cellular differentiation.
- Na+/K+-ATPase is a crucial ion transporter in cell membrane function.
Purpose of the Study:
- To investigate the role of Na+/K+-ATPase activity during the differentiation of Friend erythroleukemia cells.
- To determine if changes in Na+/K+-ATPase mediated ion flux correlate with induced differentiation.
Main Methods:
- Treatment of Friend erythroleukemia cells with various chemical agents known to induce differentiation (e.g., DMSO, ouabain).
- Measurement of 86Rb+ influx, a marker for Na+/K+-ATPase activity.
- Assessment of hemoglobin synthesis as an indicator of differentiation.
- Monitoring intracellular potassium ion concentration and cell volume.
Main Results:
- Chemical agents inducing differentiation caused an early decrease in 86Rb+ influx mediated by Na+/K+-ATPase.
- The extent of the decrease in 86Rb+ influx correlated with the proportion of cells synthesizing hemoglobin.
- Compounds that did not induce differentiation did not alter 86Rb+ influx.
- DMSO induction did not change intracellular K+ concentration due to parallel changes in cell volume.
Conclusions:
- The Na+/K+-ATPase activity is early affected during chemical-induced differentiation of Friend erythroleukemia cells.
- These findings suggest a potential involvement of Na+/K+-ATPase in the mechanism of Friend cell differentiation.