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Electrical coupling between pyramidal cells in adult cortical regions
Audrey Mercer1, A Peter Bannister, Alex M Thomson
1Department of Pharmacology, The School of Pharmacy, London University, 29-39 Brunswick Square, London, WC1N 1AX, UK.
Brain Cell Biology
|October 18, 2007
Summary
Electrical coupling between pyramidal cells in the cortex is sparse but strong, influencing network synchrony and burst firing. This study provides direct evidence for this phenomenon in hippocampal CA1 pyramidal neurons.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Cellular Electrophysiology
Background:
- Electrical coupling between cortical interneurons is well-established and linked to network oscillations.
- Direct evidence for electrical coupling between pyramidal cells has been limited, making it a controversial topic.
Purpose of the Study:
- To investigate the presence and extent of electrical coupling between cortical and hippocampal pyramidal cells.
- To characterize the functional impact of pyramidal cell coupling on neuronal network activity.
Main Methods:
- Dual intracellular recordings from pairs of CA1 pyramidal neurons in the hippocampus.
- Analysis of voltage changes and action potential propagation between coupled cells.
Main Results:
- Strong but sparse electrical coupling was observed between CA1 pyramidal neurons, with ~70% of cells coupled to immediate neighbors.
- Significant voltage transfer (25% steady-state, 10% peak action potential) occurred between coupled cells.
- Evidence suggests 'spikelets' represent full action potentials in coupled cells, influencing target neuron excitation.
Conclusions:
- Pyramidal cells are electrically coupled, contributing to neuronal synchrony and burst firing.
- This coupling, though sparse, plays a role in information processing within cortical and hippocampal networks.
- The findings resolve controversy regarding pyramidal cell electrical connectivity.
