title: Isobolographic analysis of interactions between 1-methyl-1,2,3,4-tetrahydroisoquinoline and four conventional antiepileptic drugs in the mouse maximal electroshock-induced seizure model.
abstract: The anticonvulsant activity of 1-methyl-1,2,3,4-tetrahydroisoquinoline (MeTHIQ--an endogenous parkinsonism-preventing substance) administered alone and in combination with four conventional antiepileptic drugs (carbamazepine, phenytoin, phenobarbital and valproate) was determined in the mouse maximal electroshock-induced seizure model. The types of interactions of MeTHIQ with the antiepileptic drugs were characterized using isobolographic analysis. The isobolographic analysis revealed that the combination of MeTHIQ with phenobarbital at the fixed-ratios of 1:3, 1:1 and 3:1 exerted supra-additive (synergistic) interaction in the maximal electroshock-induced seizure test. In contrast, the combinations of MeTHIQ with carbamazepine, phenytoin and valproate exerted additive interaction for all three fixed-ratios (1:3, 1:1 and 3:1) tested in the maximal electroshock-induced seizure test. In conclusion, MeTHIQ produces a clear-cut anticonvulsant effect in the maximal electroshock-induced seizure test in mice. The supra-additive interaction of MeTHIQ with phenobarbital against maximal electroshock-induced seizures makes their combination of pivotal importance from a clinical viewpoint.
authors.affiliation: Department of Pathophysiology, Medical University of Lublin, Lublin, Poland. jluszczki@yahoo.com
authors.forename: Jarogniew J
authors.initials: JJ
authors.lastname: Luszczki
authors.forename: Lucyna
authors.initials: L
authors.lastname: Antkiewicz-Michaluk
authors.forename: Stanislaw J
authors.initials: SJ
authors.lastname: Czuczwar
mesh_terms: D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology* / Q000627:therapeutic use*; D004338:Drug Combinations; D004347:Drug Interactions; D004597:Electroshock; D018737:Hand Strength; D008297:Male; D008568:Memory / Q000187:drug effects; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D018482:Muscle, Skeletal / Q000187:drug effects / Q000502:physiology; D012640:Seizures / Q000188:drug therapy* / Q000209:etiology*; D044005:Tetrahydroisoquinolines / Q000494:pharmacology* / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D000927:Anticonvulsants; D004338:Drug Combinations; D044005:Tetrahydroisoquinolines; C050386:1-methyl-1,2,3,4-tetrahydroisoquinoline