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Ca2+-dependent K+ transport in the Ehrlich ascites tumor cell
Biochimica Et Biophysica Acta
|March 8, 1982
Summary
Ehrlich ascites tumor cells exhibit a calcium-dependent potassium channel. This channel facilitates potassium (K+) loss and rubidium-86 (86Rb) flux, similar to other cell types.
Area of Science:
- Biochemistry
- Cell Biology
- Ion Transport
Background:
- The Ehrlich ascites tumor cell is a model for studying cellular transport mechanisms.
- Calcium-dependent potassium (K+) channels play crucial roles in various cellular functions.
Purpose of the Study:
- To investigate the presence and properties of a Ca2+-dependent K+ channel in Ehrlich ascites tumor cells.
- To compare the characteristics of this channel with those found in other cell systems.
Main Methods:
- Treatment of Ehrlich cells with ionophore A23187 + Ca2+, propranolol, or ascorbate-phenazine methosulphate.
- Measurement of K+ and Na+ net flux.
- Assessment of 86Rb influx and efflux.
- Antagonism studies using quinine and EGTA.
Main Results:
- Activating agents induced a net loss of K+ balanced by Na+ uptake.
- These agents stimulated both influx and efflux of 86Rb.
- Quinine and EGTA antagonized these effects, while ouabain did not.
Conclusions:
- The Ehrlich ascites tumor cell possesses a Ca2+-dependent K+ channel.
- The properties of this channel are comparable to those identified in other cell systems.