title: Synthesis, physicochemical properties, anticonvulsant activities, and GABA-ergic and voltage-sensitive calcium channel receptor affinities of alpha-substituted N-benzylamides of gamma-hydroxybutyric acid. Part 4: Search for new anticonvulsant compounds.
abstract: In a search for new anticonvulsant compounds, two series of N-benzylamides of alpha-(benzylamino)-gamma-hydroxybutyric acid (series A) and alpha-(2-phenylethylamino)-gamma-hydroxybutyric acid (series B), were investigated in maximal electroshock (MES), subcutaneous metrazole, and rotorod toxicity assays. The most potent anticonvulsant compounds were alpha-(benzylamino)-gamma-hydroxybutyric acid N-benzylamide (3) and N-(2-chlorobenzylamide (4) with median effective (ED50) doses 63.0 mg/kg and 54.0 mg/kg, respectively. alpha-(4-Phenylpiperazinyl)-gamma-hydroxybutyric acid N-(4-methylbenzyl)amide (17) and alpha-(benzylpiperazinyl-gamma-hydroxy-butyric acid N-(4-methylbenzyl)amide (18) were also tested for their ability to potentiate [3H]-muscimol binding and to inhibit [35S]-TBPS binding (as indices of GABA-A receptor potentiation). Amide 17 exhibited activity at the GABA-A complex which may be the mechanism by which the anticonvulsant effect of this compound is mediated. The N-benzylamides of alpha-(benzylamino)-gamma-hydroxybutyric acid (3-9) were also evaluated for their ability to displace [3H]-nitrendipine from voltage-sensitive calcium channel (VSCC) receptors isolated from rat cortex.
authors.affiliation: Department of Pharmaceutical Chemistry, Collegium Medicum of Jagiellonian University, Kraków, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Malawska
authors.forename: K
authors.initials: K
authors.lastname: Kulig
authors.forename: L
authors.initials: L
authors.lastname: Antkiewicz-Michaluk
authors.forename: R
authors.initials: R
authors.lastname: Porter
authors.forename: A
authors.initials: A
authors.lastname: Misra
authors.forename: I A
authors.initials: IA
authors.lastname: Cliffe
mesh_terms: D000818:Animals; D000927:Anticonvulsants / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D015220:Calcium Channels / Q000187:drug effects / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D004597:Electroshock; D008297:Male; D051379:Mice; D016548:Prosencephalon / Q000378:metabolism*; D051381:Rats; D011963:Receptors, GABA-A / Q000187:drug effects / Q000378:metabolism*; D012640:Seizures / Q000517:prevention & control*; D012978:Sodium Oxybate / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D000927:Anticonvulsants; D015220:Calcium Channels; D011963:Receptors, GABA-A; D012978:Sodium Oxybate