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Halothane and diazepam inhibit ketamine-induced c-fos expression in the rat cingulate cortex
S Nakao1, T Adachi, M Murakawa
1Department of Critical Care Medicine, Kyoto University Hospital, Japan.
Anesthesiology
|October 1, 1996
Summary
Ketamine causes brain changes, but diazepam and halothane can prevent these effects in specific brain regions. This study investigated the neural basis of these protective drug interactions.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Ketamine, an N-methyl-D-aspartate antagonist, induces psychotomimetic side effects and neuronal damage in specific brain regions.
- Previous research indicates noncompetitive N-methyl-D-aspartate antagonists like ketamine increase c-Fos protein expression in the cingulate and retrosplenial cortices.
- Benzodiazepines can mitigate ketamine's side effects, but the underlying neural mechanisms remain unclear.
Purpose of the Study:
- To investigate the effects of diazepam and halothane on ketamine-induced c-Fos expression.
- To elucidate the neural basis of the interaction between ketamine and these drugs.
Main Methods:
- Rats were administered diazepam or halothane before ketamine injection.
- c-Fos protein expression was measured in brain sections using immunohistochemical methods.
- Dose-dependent effects of diazepam and halothane on ketamine-induced c-Fos expression were analyzed.
Main Results:
- Ketamine induced c-Fos expression in the cingulate cortex, retrosplenial cortex, thalamus, and neocortex.
- Diazepam and halothane dose-dependently suppressed ketamine-induced c-Fos expression in the cingulate and retrosplenial cortices.
- The thalamus was less affected by the inhibitory actions of diazepam and halothane.
Conclusions:
- Both diazepam and halothane effectively inhibit ketamine-induced c-Fos expression in key brain regions.
- These findings suggest a neuroprotective role for diazepam and halothane against ketamine-induced neuronal changes.
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