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Inter-individual variation in the effect of antiepileptic drugs in the intrahippocampal kainate model of mesial temporal lobe epilepsy in mice
- Source :
- Neuropharmacology. 90
- Publication Year :
- 2014
-
Abstract
- Despite more than 20 clinically approved antiepileptic drugs (AEDs), there remains a substantial unmet clinical need for patients with refractory (AED-resistant) epilepsy. Animal models of refractory epilepsy are needed for at least two goals; (1) better understanding of the mechanisms underlying resistance to AEDs, and (2) development of more efficacious AEDs for patients with refractory seizures. It is only incompletely understood why two patients with seemingly identical types of epilepsy and seizures may respond differently to the same AED. Prompted by this well-known clinical phenomenon, we previously evaluated whether epileptic rats respond differently to AEDs and discovered AED responsive and resistant animals in the same models. In the present study, we used the same approach for the widely used intrahippocampal kainate mouse model of mesial temporal lobe epilepsy. In a first step, we examined anti-seizure effects of 6 AEDs on spontaneous recurrent focal electrographic seizures and secondarily generalized convulsive seizures in epileptic mice, showing that the focal nonconvulsive seizures were resistant to carbamazepine and phenytoin, whereas valproate and levetiracetam exerted moderate and phenobarbital and diazepam marked anti-seizure effects. All AEDs seemed to suppress generalized convulsive seizures. Next we investigated the inter-individual variation in the anti-seizure effects of these AEDs and, in case of focal seizures, found responders and nonresponders to all AEDs except carbamazepine. Most nonresponders were resistant to more than one AED. Our data further validate the intrahippocampal kainate mouse model as a model of difficult-to-treat focal seizures that can be used to investigate the determinants of AED efficacy.
- Subjects :
- Phenytoin
Levetiracetam
Drug Resistance
Pharmacology
Hippocampus
Cellular and Molecular Neuroscience
Epilepsy
Mice
Seizures
medicine
Animals
Valproic Acid
Diazepam
Kainic Acid
Piracetam
Electroencephalography
Carbamazepine
medicine.disease
Electrodes, Implanted
Disease Models, Animal
Epilepsy, Temporal Lobe
Phenobarbital
Anticonvulsants
Female
Psychology
medicine.drug
Subjects
Details
- ISSN :
- 18737064
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Neuropharmacology
- Accession number :
- edsair.doi.dedup.....60770298df22902294ec68e2acdda80e