The relationship between sodium channel inhibition and anticonvulsant activity in a model of generalised seizure in the rat
| Autor: | Andrea M. Bradford, Adam J. Lucas, Alberto Ruffo, Kevin D. Read, Nigel E. Austin, Giuseppe Alvaro, Mikhail Kalinichev, Corrado Carignani, Charles H. Large, Declan N.C. Jones, Ilaria Sartori, Nicoletta Garbati |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Patch-Clamp Techniques Sodium medicine.medical_treatment Biophysics chemistry.chemical_element Pharmacology Lamotrigine Transfection Sodium Channels Membrane Potentials Seizures In vivo medicine Animals Humans Potency Drug Interactions Cell Line Transformed Electroshock Valproic Acid Dose-Response Relationship Drug biology Triazines Sodium channel Electric Stimulation Rats Disease Models Animal Anticonvulsant Neurology chemistry Enzyme inhibitor biology.protein Anticonvulsants Neurology (clinical) Dialysis Sodium Channel Blockers medicine.drug |
| Zdroj: | Epilepsy Research. 85:96-106 |
| ISSN: | 0920-1211 |
| DOI: | 10.1016/j.eplepsyres.2009.02.018 |
| Popis: | The development of novel anticonvulsant drugs with improved efficacy for the treatment of epilepsy is hindered by a lack of information regarding the quantitative relationship between target mechanism and in vivo efficacy. In the present study we have examined the correlation between the potency of structurally diverse compounds at voltage-gated sodium channels in vitro and their efficacy in a rodent model of acute generalised seizures induced by electroshock. We observed a significant correlation between the estimated affinity (Ki) of the compounds for the inactivated state of human recombinant Na(V)1.2 channels and the unbound brain concentration required for anticonvulsant efficacy. Furthermore, the data suggest that an unbound concentration equivalent to less than 50% of the Ki is sufficient for anticonvulsant effect. We noted that increasing sodium channel blocking potency was associated with increasing brain tissue binding and lipophilicity. These data suggest that there is a balance between sodium channel blocking potency in vitro and good pharmacokinetic characteristics necessary for anticonvulsant efficacy in vivo. Finally, we examined the sodium channel blocking potency of sodium valproate in relation to its anticonvulsant efficacy in vivo. We found that a higher unbound concentration of the drug in the brain was required for anticonvulsant efficacy than would be expected given its sodium channel blocking potency. |
| Databáze: | OpenAIRE |
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