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Ba++ induced square-shaped potential waves in molluscan neurones
Experientia
|March 15, 1977
Summary
Barium (Ba++) ions induce rhythmic slow potential waves in Aplysia neurons, similar to natural bursting. This occurs due to changes in membrane permeability and resistance during these waves.
Area of Science:
- Neuroscience
- Cellular Electrophysiology
Background:
- Neuronal bursting is crucial for complex behaviors.
- Understanding the ionic mechanisms of bursting is key to neuroscience.
Purpose of the Study:
- To investigate the effects of substituting calcium (Ca++) with barium (Ba++) on neuronal activity in Aplysia.
- To analyze the ionic permeability and membrane resistance changes during induced slow potential waves.
Main Methods:
- Aplysia neurons were treated with barium (Ba++) ions, replacing calcium (Ca++).
- Electrophysiological recordings were performed to measure membrane potential.
- Slow current ramps were used to analyze membrane properties.
Main Results:
- Rhythmic, slow, square-shaped potential waves (20-50 sec) were induced by Ba++.
- During wave plateaus, membrane permeability to Ba++ increased significantly.
- In interwave periods, membrane resistance increased approximately 60-fold.
- Analysis indicated similarities between Ba++-treated and naturally bursting neurons.
Conclusions:
- Barium (Ba++) can effectively induce bursting-like activity in Aplysia neurons.
- The study elucidates the roles of ion permeability and membrane resistance in generating rhythmic neuronal activity.