NDLI: Carbamazepine, But Not Valproate, Displays Pharmacoresistance In Lamotrigine-Resistant Amygdala Kindled Rats

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Carbamazepine, But Not Valproate, Displays Pharmacoresistance In Lamotrigine-Resistant Amygdala Kindled Rats

Content Provider	PubMed Central
Author	Srivastava, Ajay K. White, H. Steve
Copyright Year	2012
Abstract	The voltage gated sodium channel (VGSC) blocker lamotrigine (LTG), when administered during kindling acquisition, leads to the development of resistance to LTG. The present study aimed to assess whether LTG-resistant amygdala-kindled rats display subsequent resistance to the VGSC blocker carbamazepine (CBZ) and the broad-spectrum antiepileptic drug (AED) sodium valproate (VPA). Two groups of male Sprague Dawley rats received either 0.5% methylcellulose (MC) or LTG (5mg/kg, i.p.) one hour before each amygdala kindling stimulation. Treatments were stopped once both the groups were fully kindled. Two days later, both groups were challenged with a higher dose of LTG (15 mg/kg, i.p.) to verify LTG-resistance in the experimental group (i.e., LTG-pretreated rats). The efficacy of CBZ and VPA was then evaluated in both groups. A higher dose of LTG blocked fully kindled seizures in the vehicle-treated rats but not seizures in the LTG-treated group. The mean seizure score, of the control group (1.2 ± 0.3) was significantly lower (p <.05) than that of the LTG-treated population (3.5±0.7; n=8). A lower percent of the population in the control group was observed to display a generalized stage 4-5 seizure compared to the experimental group (i.e., those that received LTG during kindling acquisition) (28.5% vs 62% respectively). Interestingly, CBZ (10, 20, and 40 mg/kg) displayed a dose-dependent anticonvulsant effect in the vehicle-kindled group, but was less effective in LTG-treated animals. In contrast, VPA (300 mg/kg) effectively blocked the behavioral seizure and decreased the afterdischarge duration (ADD) in both vehicle and LTG groups. These findings suggest that the LTG-resistant, amygdala-kindled rat may represent a novel model of pharmacoresistant epilepsy.
Related Links	http://dx.doi.org/10.1016/j.eplepsyres.2012.10.003
Ending Page	34
Page Count	9
Starting Page	26
File Format	PDF
ISSN	09201211
e-ISSN	18726844
Journal	Epilepsy research
Issue Number	1-2
Volume Number	104
Language	English
Publisher Date	2013-03-01
Access Restriction	Open
Subject Keyword	Neurology Clinical Neurology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neurology Neurology (clinical)

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