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Electrotonic coupling between pyramidal cells: a direct demonstration in rat hippocampal slices
Science (New York, N.Y.)
|August 14, 1981
Summary
Researchers found direct evidence of electronic coupling between rat hippocampal CA3 pyramidal cells. This neuronal communication influences brain activity, potentially synchronizing rhythmic activity and seizure discharges.
Area of Science:
- Neuroscience
- Cellular Neuroscience
- Mammalian Brain Research
Background:
- Electronic coupling in neurons was previously inferred but not directly demonstrated in the mammalian brain.
- Fast prepotentials in pyramidal cells were hypothesized to originate from dendritic spike activity.
Purpose of the Study:
- To provide direct evidence of electrotonic coupling between CA3 pyramidal neurons in the rat hippocampus.
- To investigate the nature and implications of neuronal electrical interactions.
Main Methods:
- Intracellular recordings from simultaneously impaled pairs of CA3 pyramidal neurons in rat hippocampal slices.
- Verification of paired recordings using double staining with horseradish peroxidase.
- Injection of current pulses into one neuron and measurement of voltage changes in the coupled neuron.
Main Results:
- Direct demonstration of bidirectional electronic coupling between CA3 pyramidal cells.
- Observed voltage changes in one neuron in response to current injection in a coupled neuron.
- Identified fast prepotentials as coupling potentials resulting from action potentials in electronically coupled cells.
Conclusions:
- Electrotonic coupling is a direct mechanism of communication between mammalian neurons.
- Fast prepotentials can represent electrical signals from coupled neurons, not just intrinsic dendritic activity.
- Neuronal coupling may play a role in synchronizing neural network activity, including during seizures.