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Cation transport in dog red cells.
The Journal of General Physiology
|July 1, 1972
Summary
Dog red blood cells exhibit volume-dependent cation transport. Shrinking cells significantly increases sodium (Na) uptake and inhibits potassium (K) uptake, suggesting a shift in the carrier
Area of Science:
- Physiology
- Biochemistry
- Cell Biology
Background:
- Cation transport in dog red blood cells is volume-dependent.
- Understanding these mechanisms is crucial for cell volume regulation.
Purpose of the Study:
- To investigate the cation transport system in dog red blood cells.
- To elucidate the relationship between cell volume and cation fluxes.
Main Methods:
- Utilized radioactive isotopes (24Na and 42K) to measure cation fluxes.
- Manipulated cell volume and medium osmolality.
- Employed inhibitors like iodoacetate and phloretin.
Main Results:
- A 10% decrease in cell volume markedly increased 24Na uptake and inhibited 42K uptake.
- The observed effects were dependent on cell volume changes, not medium osmolality.
- Phloretin abolished the volume effect on Na uptake and inhibited lactate production.
Conclusions:
- A cation carrier complex mediates K influx and Na efflux in normal volume cells.
- Cell shrinkage shifts carrier specificity, enhancing Na uptake via the Na electrochemical gradient.
- This highlights a novel volume-regulatory mechanism in dog red cells.