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KV7 Channels Regulate Firing during Synaptic Integration in GABAergic Striatal Neurons
M Belén Pérez-Ramírez1, Antonio Laville1, Dagoberto Tapia1
1División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, 04510 México City, DF, Mexico.
Neural Plasticity
|June 27, 2015
Summary
Cholinergic muscarinic receptors, by regulating KV7 channels, significantly impact striatal projection neuron firing properties. This modulation, occurring in dendrites, affects synaptic integration and the entire striatal microcircuit.
Area of Science:
- Neuroscience
- Cellular and Molecular Neuroscience
- Systems Neuroscience
Background:
- Striatal projection neurons (SPNs) are crucial for motor and cognitive functions.
- Parkinson's disease alters dopamine and acetylcholine levels, affecting SPN activity.
- Cholinergic interneurons release acetylcholine, activating muscarinic receptors on SPNs.
Purpose of the Study:
- To investigate if muscarinic receptor signaling is rapid enough to influence synaptic integration in SPNs.
- To determine the role of KV7/KCNQ channels in mediating cholinergic modulation of SPN responses.
- To examine the impact of this modulation on sub- and suprathreshold synaptic integration and firing properties.
Main Methods:
- Electrophysiological recordings in striatal projection neurons.
- Pharmacological manipulation of muscarinic receptors and KV7 channels.
- Analysis of synaptic responses to corticostriatal inputs.
Main Results:
- Cholinergic muscarinic modulation via KV7 channels significantly impacts corticostriatal synaptic integration.
- This modulation primarily occurs in the dendritic/spines compartment, with minimal somatic effect.
- The effects are observed on both sub- and suprathreshold responses, lasting for hundreds of milliseconds.
- Altered SPN firing properties were noted, influencing the striatal microcircuit's behavior.
Conclusions:
- KV7 channels are key mediators of cholinergic modulation in SPNs, affecting synaptic integration.
- Muscarinic receptor signaling is sufficiently rapid to influence synaptic integration during corticostriatal activity.
- Dendritic KV7 channel regulation by acetylcholine plays a critical role in shaping SPN output and striatal network function.
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