Related Experiment Video
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Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
Published on: June 24, 2015
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Interaction Between HCN and Slack Channels Regulates mPFC Pyramidal Cell Excitability in Working Memory Circuits
Jing Wu1, Lynda El-Hassar1, Dibyadeep Datta2
1Department of Pharmacology, Yale School of Medicine, New Haven, CT, 06520, USA.
Molecular Neurobiology
|October 27, 2023
Summary
Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels in the prefrontal cortex regulate working memory by activating Slack channels, suppressing neuronal excitability and improving cognitive performance.
Area of Science:
- Neuroscience
- Molecular Biology
- Cognitive Science
Background:
- Spatial working memory relies on persistent neuronal firing in the prefrontal cortex (PFC).
- Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels on dendritic spines modulate PFC network activity.
- cAMP activation of HCN channels paradoxically reduces working memory-related firing in PFC pyramidal cells.
Purpose of the Study:
- To investigate the mechanism by which HCN channel activation leads to neuronal hyperpolarization and reduced firing.
- To test the hypothesis that HCN channels activate Slack Na+-activated K+ (KNa) channels, causing hyperpolarization.
Main Methods:
- Co-immunoprecipitation and immunoelectron microscopy to assess HCN and Slack channel interaction and localization.
- Electrophysiological recordings in pyramidal cells and HEK cells to study channel function.
- Calcium imaging to analyze the effect of cAMP on HCN and Slack channels.
- Pharmacological inhibition of Slack channels in rat PFC to evaluate working memory performance.
Main Results:
- HCN and Slack KNa channels colocalize at postsynaptic spines of PFC pyramidal neurons.
- Blockade of HCN channels reduces KNa current, indicating indirect modulation via Na+ influx.
- cAMP activation of HCN channels increases intracellular Ca2+, but this effect is reversed when Slack channels are co-expressed.
- Pharmacological inhibition of Slack channels in rat PFC enhances working memory.
Conclusions:
- A novel HCN-Slack channel complex in PFC pyramidal neurons mediates the regulation of working memory.
- This complex links HCN channel activation to the suppression of neuronal excitability, impacting cognitive function.
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