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Intracellular Cl activity changes of frog skin
The American Journal of Physiology
|September 1, 1985
Summary
Intracellular chloride activity in frog skin is regulated by electroneutral mechanisms, not direct electrical currents. Chloride transport across cell membranes occurs without significant immediate changes in membrane potential.
Area of Science:
- Physiology
- Membrane Transport
- Electrophysiology
Background:
- Intracellular chloride (Cl) activity and potential are crucial for cell function.
- Understanding Cl transport mechanisms is vital for various physiological processes.
Purpose of the Study:
- To investigate the mechanisms of intracellular chloride transport across frog skin.
- To determine if chloride transport is mediated by electrical or electroneutral pathways.
Main Methods:
- Utilized short-circuited frog skin preparations.
- Employed single-barrel microelectrodes to measure intracellular Cl activity and potential.
- Manipulated apical and basolateral solutions to alter Cl concentrations.
Main Results:
- Intracellular Cl activity was significantly above electrochemical equilibrium in normal conditions.
- Cl depletion reduced intracellular Cl activity and potential.
- Amiloride blocked Cl-induced increase in intracellular Cl activity on the apical side.
- Changes in membrane potential were delayed, suggesting low Cl conductance.
Conclusions:
- Chloride transfer across frog skin cell membranes occurs primarily via electroneutral mechanisms.
- Direct electrical Cl conductance is not detectable.
- These findings elucidate the primary mode of Cl transport in epithelial tissues.