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Cortical stimulation induces fos expression in striatal neurons
1Department of Anatomy and Cell Biology, Medical University of South Carolina, Charleston 29425.
Neuroscience
|January 1, 1992
Summary
Electrical stimulation of the rat frontoparietal cortex activates Fos protein in striatal neurons. This suggests direct genomic influence via corticostriatal pathways, independent of dopamine.
Area of Science:
- Neuroscience
- Molecular Biology
- Neuroanatomy
Background:
- The striatum plays a crucial role in motor control and reward processing.
- Understanding neuronal activation patterns is key to deciphering brain function.
- The immediate early gene Fos is a marker for neuronal activity.
Purpose of the Study:
- To investigate the effect of frontoparietal cortex electrical stimulation on Fos expression in the rat striatum.
- To determine the time course and laterality of Fos induction.
- To explore the role of the nigrostriatal dopamine pathway in this response.
Main Methods:
- Electrical stimulation of the frontoparietal cortex in rats.
- Immunocytochemistry to detect Fos protein.
- 6-hydroxydopamine lesions to deplete dopamine.
- Retrograde tracing with Fluoro-Gold to identify neuronal projections.
Main Results:
- Cortical stimulation induced Fos expression in striatal neurons, peaking at 0.5 hours post-stimulation.
- Fos labeling was more pronounced ipsilateral to the stimulation.
- Fos induction was independent of the nigrostriatal dopamine projection.
- Retrograde labeling confirmed projections from Fos-positive neurons to the substantia nigra.
Conclusions:
- Corticostriatal excitatory transmission can directly modulate genomic activity in striatal neurons, indicated by Fos induction.
- This mechanism operates independently of dopaminergic input from the substantia nigra.
- Fos-positive striatal neurons project to the substantia nigra, suggesting a functional link.