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GABA as the pallidothalamic neurotransmitter: implications for basal ganglia function
Brain Research
|February 23, 1981
Summary
This study shows that GABA is a neurotransmitter in the brain pathway connecting the entopeduncular nucleus to the thalamus. Reduced GABA levels suggest the corpus striatum may disinhibit thalamic function.
Area of Science:
- Neuroscience
- Neurochemistry
Background:
- The ventroanterolateral thalamic nucleus receives input from the entopeduncular nucleus.
- The role of specific neurotransmitters in this pathway is not fully understood.
Purpose of the Study:
- To investigate the role of GABA (gamma-aminobutyric acid) as a neurotransmitter in the entopedunculothalamic pathway.
- To explore the functional implications of the striatoentopeduncular pathway on thalamic activity.
Main Methods:
- Destruction of the rat entopeduncular nucleus using kainic acid.
- Measurement of GABA levels, high-affinity GABA uptake, and glutamic acid decarboxylase (GAD) levels in the ventroanterolateral thalamic nucleus.
Main Results:
- Significant reductions in GABA levels, high-affinity GABA uptake, and GAD levels were observed in the ventroanterolateral thalamic nucleus post-lesion.
- These findings strongly indicate that GABA is an entopedunculothalamic neurotransmitter.
- Evidence suggests the striatoentopeduncular pathway is also GABAergic.
Conclusions:
- GABA is a key neurotransmitter in the entopedunculothalamic pathway.
- The GABAergic nature of the striatoentopeduncular pathway suggests a role in disinhibiting thalamic function by the corpus striatum.