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Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
Published on: September 20, 2024
Control of neuronal persistent activity by voltage-dependent dendritic properties.
Erwin Idoux1, Daniel Eugène, Antoine Chambaz
1Laboratoire de Neurobiologie des Réseaux Sensorimoteurs, UMR 7060, Université Paris Descartes (Paris 5) CNRS, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France.
Journal of Neurophysiology
|July 18, 2008
Summary
Persistent sodium conductances in prepositus hypoglossi nucleus (PHN) neurons influence oculomotor integration. Their role in neuronal electrotonic structure differs between type B and D neurons, impacting action potential discharge and computational properties.
Area of Science:
- Neuroscience
- Computational Neuroscience
Background:
- Persistent activity, crucial for neural integrators and working memory, is often linked to persistent sodium conductances.
- The prepositus hypoglossi nucleus (PHN) plays a key role in oculomotor integration and harbors distinct neuronal populations.
Purpose of the Study:
- To investigate the role of voltage-dependent conductances, specifically persistent sodium conductance, on the dendritic electrotonic structure of PHN neurons.
- To differentiate the impact of persistent sodium conductance on the two main neuronal types within the PHN: type B and type D neurons.
Main Methods:
- Utilized a combination of voltage-clamp, dynamic-clamp, and frequency-domain techniques.
- Employed data-fitted models to confirm dynamic-clamp findings.
- Investigated the manipulation of persistent sodium conductance in type B neurons using on-line dynamic clamp.
Main Results:
- Persistent sodium conductance is present in all PHN neurons but affects the dynamic electrotonic structure differently in type B and type D neurons.
- Type D neurons exhibit greater electrotonic length compared to type B neurons.
- Persistent sodium conductance can be effectively manipulated in type B neurons via dynamic clamp.
- Models suggest distinct roles for somatic (action potential discharge) versus dendritic (computational properties) persistent sodium conductances.
Conclusions:
- Persistent sodium conductance plays a differential role in the electrotonic structure of PHN neuronal subtypes.
- The location of persistent sodium conductance (somatic vs. dendritic) influences its contribution to neuronal function, affecting action potential discharge and advanced computational roles.
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