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Optokinetic and vestibulo-ocular reflex adjustment by GABA antagonists
A Reber1, B Poitevin, M H Leroy
1Laboratoire de Neurosciences et Environnement, Université de Rouen, Faculté des Sciences, Mont-Saint-Aignan, France. Annie.Reber@univ-rouen.fr
Behavioural Brain Research
|November 1, 1996
Summary
High doses of anti-GABAergic drugs depress visuo-vestibular reflexes in rats. However, low doses reverse this effect, suggesting potent modulation of oculomotor systems independent of GABA levels.
Area of Science:
- Neuroscience
- Neuropharmacology
- Oculomotor System
Background:
- GABAergic drugs impact visuo-vestibular activity.
- The role of GABA levels in this modulation is not fully understood.
Purpose of the Study:
- To investigate the dose-dependent effects of anti-GABAergic drugs on visuo-vestibular reflexes.
- To explore the correlation between drug dosage, GABA levels, and oculomotor function.
Main Methods:
- Administered high and low doses of anti-GABAergic drugs (picrotoxin) to pigmented rats.
- Measured horizontal optokinetic and vestibulo-ocular reflexes.
- Assessed GABA levels in the cerebellum and posterior brainstem.
Main Results:
- High doses of anti-GABAergic drugs depressed visuo-vestibular reflexes and decreased GABA levels.
- Low doses of anti-GABAergic drugs restored normal reflex activity.
- GABA levels did not correlate with reflex recovery at low drug doses.
Conclusions:
- Low doses of anti-GABAergic drugs can reverse the depressive effects of high doses on the oculomotor system.
- This reversal suggests potent modulation of cerebellar or vestibular pathways, potentially involving other neurotransmitters.
- Very low doses may trigger adaptive mechanisms in reflex control.