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Lateralized interdependence between limbicotemporal and ventrostriatal dopaminergic transmission
1Laboratoire de Psychobiologie des Comportements Adaptatifs, INSERM U 259, Université de Bordeaux II, France.
Neuroscience
|April 1, 1994
Summary
Schizophrenia research reveals that dopamine pathways in the brain
Area of Science:
- Neuroscience
- Psychiatry
- Dopamine Receptor Research
Background:
- Antipsychotic effects suggest dopaminergic hyperactivity in schizophrenia.
- Elevated D2 dopamine receptors in the left putamen contrast with ventral striatum transmission.
- Alterations in the left medial temporal lobe (entorhinal cortex, hippocampus) are observed in schizophrenics.
Purpose of the Study:
- To investigate the hypothesis of impaired functional relationship between left temporal structures and the left ventral striatum in schizophrenia.
- To assess the existence of preferentially left hemispheric interdependency between dopaminergic pathways.
- To explore the role of temporal D2 dopamine receptors in this lateralized functioning.
Main Methods:
- Investigated dopaminergic pathways in male rats.
- Focused on the functional relationship between the entorhinal cortex, hippocampus, and the nucleus accumbens.
- Examined the role of temporal D2 dopamine receptors.
Main Results:
- Dopaminergic projections from the entorhinal cortex and ventral hippocampus regulate dopaminergic transmission in the nucleus accumbens.
- This regulation is particularly pronounced in the left hemisphere.
- Temporal D2 dopamine receptors are primarily involved in this lateralized effect, suggesting a structural basis.
Conclusions:
- A preferentially left-hemispheric interdependency exists between temporal dopaminergic pathways and the ventral striatum.
- This lateralized functioning, mediated by temporal D2 dopamine receptors, may be impaired in schizophrenia.
- Findings offer new insights into the pathophysiology of schizophrenic psychoses.