Electrical activation of Na/K pumps can increase ionic concentration gradient and membrane resting potential
1Department of Cellular and Molecular Biophysics, University of South Florida, Tampa, Florida 33620, USA. wchen@cas.usf.edu
The Journal of Membrane Biology
|June 15, 2007
Summary
A novel electric field synchronizes and modulates sodium-potassium adenosine triphosphatase (Na/K ATPase) pump activity. This method enhances ionic gradients and membrane potential in skeletal muscle fibers.
Area of Science:
- Biophysics
- Muscle Physiology
- Cellular Electrophysiology
Background:
- The sodium-potassium adenosine triphosphatase (Na/K ATPase) is crucial for maintaining cellular ion gradients and membrane potential.
- Previous work demonstrated that a specific electric field can entrain and modulate Na/K ATPase molecules.
Purpose of the Study:
- To investigate the effects of a synchronization-modulation electric field on intact twitch skeletal muscle fibers.
- To determine if this field can alter ionic concentration gradients and membrane potential.
Main Methods:
- Application of a synchronization-modulation electric field to skeletal muscle fibers.
- Monitoring ionic concentration gradients using fluorescent probes.
- Measuring membrane potential via confocal microimaging.
- Utilizing ouabain to confirm the role of Na/K ATPase.
Main Results:
- The electric field consistently increased the ionic concentration gradient across the muscle cell membrane.
- A subsequent hyperpolarization of the membrane potential was observed.
- These effects were abolished by ouabain, confirming involvement of the Na/K pump.
- Previous findings on pump molecule entrainment were corroborated.
Conclusions:
- The synchronization-modulation electric field effectively activates Na/K pump function in skeletal muscle.
- This activation leads to an increased ionic concentration gradient and elevated membrane potential.
- The findings support the potential of this electric field for modulating cellular electrophysiology.
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