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Cortical afferents modulate striatal gap junction permeability via nitric oxide
1Department of Neuroscience, University of Pittsburg, PA 15260, USA.
Neuroscience
|January 1, 1997
Summary
Nitric oxide (NO) enhances communication between rat brain neurons by opening gap junctions. This discovery reveals a novel pathway for how the cortex influences subcortical brain activity.
Area of Science:
- Neuroscience
- Cellular Biology
- Neurochemistry
Background:
- Nitric oxide (NO) acts as a crucial cellular messenger in the central nervous system.
- NO influences neuronal function, including membrane conductances, neurotransmitter release, and blood flow.
- Previous research indicates NO modulates gap junction conductance in the retina and cortex.
Purpose of the Study:
- To investigate the role of nitric oxide in modulating neuronal communication within the striatum.
- To determine if nitric oxide mediates the effects of cortical afferent activation on neuronal coupling.
Main Methods:
- In vitro electrophysiological recordings from rat neostriatal neurons.
- Activation of cortical afferents.
- Application of a nitric oxide donor and a nitric oxide synthase inhibitor.
Main Results:
- Activation of cortical afferents increased dye coupling between neostriatal neurons.
- This increase in neuronal coupling was replicated by a nitric oxide donor.
- A nitric oxide synthase inhibitor blocked the effect of cortical afferent activation.
Conclusions:
- Synaptic activation of corticostriatal fibers modulates neuronal communication via nitric oxide release.
- This study provides the first evidence for nitric oxide-mediated synaptic modulation of gap junctions.
- This mechanism may explain how cortical activity influences subcortical pattern formation in the striatum.