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NMDA Actions on Rat Abducens Motoneurons
1Unité de Neurocybernétique Cellulaire, UPR 418, CNRS, 280 bd Sainte Marguerite, 13009 Marseille, France.
The European Journal of Neuroscience
|July 1, 1991
Summary
N-methyl-d-aspartate (NMDA) receptors in rat abducens motoneurons induce rhythmic activity. This voltage-dependent response is modulated by hyperpolarization, suggesting dendritic NMDA receptor activation.
Area of Science:
- Neuroscience
- Cellular Electrophysiology
Background:
- Abducens motoneurons play a crucial role in eye movement control.
- N-methyl-d-aspartate (NMDA) receptors are implicated in synaptic plasticity and neuronal excitability.
Purpose of the Study:
- To investigate the presence and function of NMDA receptors in rat abducens motoneurons.
- To explore the role of NMDA receptor activation in generating rhythmic neuronal activity.
Main Methods:
- In vivo intracellular recordings from rat abducens motoneurons.
- Micro-ionophoretic application of NMDA and its antagonists (APV, kynurenate, MK801).
- Voltage-clamp and current-injection techniques to modulate neuronal membrane potential.
Main Results:
- NMDA application induced depolarization and firing in abducens motoneurons.
- NMDA responses were blocked by antagonists and were voltage-dependent.
- Hyperpolarization blocked short NMDA responses but induced rhythmic plateau potentials with long NMDA application.
Conclusions:
- NMMA receptors are present and functional in rat abducens motoneurons.
- NMDA receptor activation contributes to rhythmic activity, potentially via dendritic receptors.
- Voltage-dependent properties of NMDA receptor channels are critical for these oscillations.