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Benzodiazepine receptor in brain
Abstract:
The evidence that the brain possesses specific receptors for benzodiazepines is summarized. Further we present a series of brain lesion experiments in rats showing that specific neuronal destructions by 6-hydroxydopamine, kainic acid in the striatum, X-ray irradiation of the hippocampus, intraperitoneal 3-acetyl-pyridine or hemisection at the thalamic level do not reduce the level of benzodiazepine receptors in striatum, hippocampus, cortex or cerebellum. These results show that the benzodiazepines are not positioned on dopamine or noradrenaline terminals, cholergic or GABA-ergic neurons in the striatum, granular cells in the hippocampus or climbing fibers in the cerebellum.
Insights
Brain lesion experiments in rats demonstrate that benzodiazepine receptors are not located on specific neuronal pathways. These findings suggest benzodiazepines do not target dopamine, noradrenaline, or GABA-ergic neurons.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Benzodiazepines are widely used psychoactive drugs.
- The precise location of benzodiazepine receptors in the brain is crucial for understanding their mechanism of action.
Purpose of the Study:
- To investigate the localization of benzodiazepine receptors in the rat brain.
- To determine if specific neuronal populations are associated with benzodiazepine receptor binding.
Main Methods:
- Brain lesion experiments were conducted in rats.
- Specific neuronal structures were lesioned using agents like 6-hydroxydopamine and kainic acid, or physical methods like X-ray irradiation and hemisection.
- Benzodiazepine receptor levels were measured in various brain regions (striatum, hippocampus, cortex, cerebellum).
Main Results:
- Neuronal destructions in the striatum, hippocampus, and other brain regions did not alter benzodiazepine receptor levels.
- These results indicate that benzodiazepine receptors are not situated on dopamine or noradrenaline terminals, cholinergic or GABA-ergic neurons in the striatum, hippocampal granular cells, or cerebellar climbing fibers.
Conclusions:
- Benzodiazepine receptors are not localized to the specific neuronal pathways investigated.
- The findings challenge previous assumptions about the cellular targets of benzodiazepines.