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Direct-current Stimulation and Multi-electrode Array Recording of Seizure-like Activity in Mice Brain Slice Preparation
Published on: June 7, 2016
Anatomically dependent anticonvulsant properties of temporally-coded electrical stimulation
Daniel de Castro Medeiros1, Vinícius Rosa Cota, Maura Regina Silva da Páscoa Vilela
1Núcleo de Neurociências, Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
Epilepsy & Behavior : E&B
|February 29, 2012
Summary
Electrical stimulation patterns in the amygdala can either trigger or prevent seizures in epilepsy models. The study shows that the brain region stimulated, not just the pattern, determines the effect on seizure outcome.
Area of Science:
- Neuroscience
- Epilepsy Research
- Neurophysiology
Background:
- Electrical stimulation (ES) of the amygdaloid complex can have pro- or anticonvulsant effects in the pentylenetetrazole (PTZ) animal model of epilepsy.
- The outcome depends on the temporal pattern of stimulation: periodic (PS) and non-periodic (NPS).
Purpose of the Study:
- To investigate if the anatomical target of temporally-coded electrical stimulation influences its differential effect on seizure outcome in an epilepsy model.
- To determine the role of the amygdaloid complex versus the thalamus in modulating seizure thresholds.
Main Methods:
- Utilized the PTZ animal model to assess epilepsy.
- Measured the threshold dose of PTZ required to induce forelimb clonus and generalized tonic-clonic seizures.
- Applied periodic (PS) and non-periodic (NPS) electrical stimulation to the amygdaloid complex and thalamus.
Main Results:
- Amygdaloid PS showed a pro-convulsive effect on forelimb clonus threshold, while NPS was anticonvulsant.
- NPS stimulation of the amygdala significantly increased the generalized tonic-clonic seizure threshold.
- Thalamus stimulation did not affect forelimb clonus threshold and exhibited similar anticonvulsant effects for both PS and NPS on generalized tonic-clonic seizures.
Conclusions:
- The anatomical target is a critical determinant in whether temporally-coded electrical stimulation differentially modulates seizure outcome.
- These findings highlight the importance of targeted stimulation in potential epilepsy therapies.
