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Ionic basis of resting membrane potential in frog taste cells
The Japanese Journal of Physiology
|January 1, 1984
Summary
The resting membrane potential of bullfrog taste cells depends on potassium and sodium ion concentrations. Ionic and metabolic factors contribute to this potential, with membrane permeability to K+ and Na+ being key.
Area of Science:
- Physiology
- Neuroscience
- Cell Biology
Background:
- The resting membrane potential (RMP) is crucial for cell function.
- Understanding RMP in sensory cells like taste cells is important.
Purpose of the Study:
- To investigate the determinants of the resting membrane potential in bullfrog taste cells.
- To elucidate the roles of specific ions (K+, Na+, Ca2+, Cl-) and metabolic processes in RMP.
Main Methods:
- Intracellular recordings of RMP in bullfrog taste cells.
- Perfusion of cells with various physiological saline solutions to alter interstitial ion concentrations.
- Application of Ouabain to assess the Na+-K+ exchange pump's role.
Main Results:
- The RMP was -28 ± 4 mV in normal Ringer solution.
- RMP was highly dependent on interstitial potassium ([K+]) and sodium ([Na+]) concentrations.
- Ouabain significantly decreased RMP, suggesting Na+-K+ pump involvement.
- Calcium and chloride ions did not significantly affect RMP.
Conclusions:
- Bullfrog taste cell RMP comprises ionic and metabolic components.
- The ionic component is primarily determined by membrane permeability to K+ and Na+.
- The Na+-K+ exchange pump plays a significant role in maintaining RMP.