title: N6-2-(4-aminophenyl)ethyl-adenosine enhances the anticonvulsive activity of antiepileptic drugs.
abstract: N6-2-(4-Aminophenyl)ethyl-adenosine (APNEA, a non-selective agonist of the adenosine A3 receptors), at the subprotective dose of 1 mg/kg against electroconvulsions, significantly potentiated the anticonvulsive action of phenobarbital, diphenylhydantoin and valproate against maximal electroshock, being ineffective at lower doses. APNEA (0.0039-1 mg/kg) also enhanced the protective activity of carbamazepine. Aminophylline (5 mg/kg) and 8-cyclopentyl-1,3-dimethylxanthine (8-CPX, 5 mg/kg), reversed the APNEA (1 mg/kg)-induced enhancement of the anticonvulsive action of phenobarbital, diphenylhydantoin and valproate, but not that of carbamazepine produced by APNEA at 0.0039 mg/kg. The adenosine agonist did not alter the plasma levels of antiepileptic drugs studied, so a pharmacokinetic interaction is not probable. Finally, APNEA (0.0156 and 1 mg/kg) administered alone or in combination with carbamazepine significantly decreased the body temperature and impaired long-term memory. Our results suggest that APNEA at low doses potentiates the protective activity of carbamazepine most likely through the A subtype of adenosine receptors. At higher doses, APNEA seems to enhance the anticonvulsive effect of other antiepileptics via adenosine A1 receptors.
authors.affiliation: Department of Pharmacology and Toxicology, Lublin Medical University School, Poland.
authors.forename: K K
authors.initials: KK
authors.lastname: Borowicz
authors.forename: Z
authors.initials: Z
authors.lastname: Kleinrok
authors.forename: S J
authors.initials: SJ
authors.lastname: Czuczwar
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D001831:Body Temperature / Q000187:drug effects; D002220:Carbamazepine / Q000494:pharmacology; D003624:Darkness; D004357:Drug Synergism; D004597:Electroshock; D005260:Female; D008568:Memory / Q000187:drug effects; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D010634:Phenobarbital / Q000494:pharmacology; D010672:Phenytoin / Q000494:pharmacology; D058906:Purinergic P1 Receptor Agonists; D014635:Valproic Acid / Q000494:pharmacology
chemical_list: D000927:Anticonvulsants; C086112:N(6)-2-(4-aminophenyl)ethyladenosine; D058906:Purinergic P1 Receptor Agonists; D002220:Carbamazepine; D014635:Valproic Acid; D010672:Phenytoin; D000241:Adenosine; D010634:Phenobarbital