کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3052036 1186072 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Antiepileptic efficacy of lamotrigine in phenobarbital-resistant and -responsive epileptic rats: A pilot study
ترجمه فارسی عنوان
اثربخشی ضد التهابی لاموتریگین در موشهای صحرایی مقاوم به پاسخ ایمنی فنوباربیتال و پاسخگو: یک مطالعه آزمایشی
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی عصب شناسی
چکیده انگلیسی


• Animal models of drug resistant epilepsy are important to develop novel therapies.
• We have previously developed and characterized such a model in rats.
• Part of the epileptic animals in this model is resistant to phenobarbital and phenytoin.
• Here we provide first data indicating that lamotrigine is more effective in this model.
• We hope that our model leads to improved understanding of drug resistance.

SummaryAbout 25% of patients with epilepsy are refractory to treatment, so that new, more effective antiepileptic drugs (AEDs) are urgently needed. Animal models that simulate the clinical situation with individuals responding and not responding to treatment are important to determine mechanisms of AED resistance and develop novel more effective treatments. We have previously developed and characterized such a model in which spontaneous recurrent seizures (SRS) develop after a status epilepticus induced by sustained electrical stimulation of the basolateral amygdala. In this model, prolonged treatment of epileptic rats with phenobarbital (PB) results in two subgroups, PB responders and PB nonresponders. When PB nonresponders were treated in previous experiments with phenytoin (PHT), 83% of the PB-resistant rats were also resistant to PHT. In the present study we examined if rats with PB resistant seizures are also resistant to lamotrigine (LTG), using continuous EEG/video recording of spontaneous seizures over 10 consecutive weeks. For this purpose, a new group of epileptic rats was produced and selected by treatment with PB into responders and nonresponders. As in previous studies, PB nonresponders had a significantly higher seizure frequency before onset of treatment. During subsequent treatment with LTG, all PB nonresponders and 60% of the PB responders exhibited >75% reduction of seizure frequency and were therefore considered as LTG responders. Plasma levels of LTG did not differ significantly between responders and nonresponders. The data of this pilot study indicate that LTG is more effective than PHT to suppress seizures in PB nonresponders in this model, but that not all PB responders also respond to LTG. Overall, our data provide further evidence that AED studies in post-SE TLE models are useful in determining and comparing AED efficacy and investigating predictors and mechanisms of pharmacoresistance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Epilepsy Research - Volume 108, Issue 7, September 2014, Pages 1145–1157
نویسندگان
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