title: BIIR 561 CL: a novel combined antagonist of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors and voltage-dependent sodium channels with anticonvulsive and neuroprotective properties.
abstract: Antagonists of glutamate receptors of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) subtype, as well as of voltage-gated sodium channels, exhibit anticonvulsive and neuroprotective properties in vivo. One can postulate that a compound that combines both principles might be useful for the treatment of disorders of the central nervous system, like focal or global ischemia. Here, we present data on the effects of dimethyl-(2-[2-(3-phenyl-[1,2, 4]oxadiazol-5-yl)-phenoxy]ethyl)-amine hydrochloride (BIIR 561 CL) on neuronal AMPA receptors and voltage-dependent sodium channels. BIIR 561 CL inhibited AMPA receptor-mediated membrane currents in cultured cortical neurons with an IC50 value of 8.5 microM. The inhibition was noncompetitive. In a cortical wedge preparation, BIIR 561 CL reduced AMPA-induced depolarizations with an IC50 value of 10.8 microM. In addition to the effects on the glutamatergic system, BIIR 561 CL inhibited binding of radiolabeled batrachotoxin to rat brain synaptosomal membranes with a Ki value of 1.2 microM. The compound reduced sodium currents in voltage-clamped cortical neurons with an IC50 value of 5.2 microM and inhibited the veratridine-induced release of glutamate from rat brain slices with an IC50 value of 2.3 microM. Thus, BIIR 561 CL inhibited AMPA receptors and voltage-gated sodium channels in a variety of preparations. BIIR 561 CL suppressed tonic seizures in a maximum electroshock model in mice with an ED50 value of 2.8 mg/kg after s.c. administration. In a model of focal ischemia in mice, i.p. administration of 6 or 60 mg/kg BIIR 561 CL reduced the area of the infarcted cortical surface. These data show that BIIR 561 CL is a combined antagonist of AMPA receptors and voltage-gated sodium channels with promising anticonvulsive and neuroprotective properties.
authors.affiliation: Boehringer Ingelheim Pharma KG, Department of CNS Research, Ingelheim, Germany. weiser@ing.boehringer-ingelheim.com
authors.forename: T
authors.initials: T
authors.lastname: Weiser
authors.forename: M
authors.initials: M
authors.lastname: Brenner
authors.forename: R
authors.initials: R
authors.lastname: Palluk
authors.forename: W D
authors.initials: WD
authors.lastname: Bechtel
authors.forename: A
authors.initials: A
authors.lastname: Ceci
authors.forename: A
authors.initials: A
authors.lastname: Brambilla
authors.forename: H A
authors.initials: HA
authors.lastname: Ensinger
authors.forename: A
authors.initials: A
authors.lastname: Sagrada
authors.forename: M
authors.initials: M
authors.lastname: Wienrich
mesh_terms: D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology; D000927:Anticonvulsants / Q000494:pharmacology*; D001496:Batrachotoxins / Q000493:pharmacokinetics; D001569:Benzodiazepines; D002462:Cell Membrane / Q000502:physiology; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology / Q000502:physiology; D004597:Electroshock; D004622:Embryo, Mammalian; D018698:Glutamic Acid / Q000378:metabolism; D066298:In Vitro Techniques; D002546:Ischemic Attack, Transient / Q000503:physiopathology / Q000517:prevention & control; D008297:Male; D008801:Mexiletine / Q000494:pharmacology; D051379:Mice; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D018696:Neuroprotective Agents / Q000494:pharmacology*; D010069:Oxadiazoles / Q000494:pharmacology*; D018408:Patch-Clamp Techniques; D051381:Rats; D017207:Rats, Sprague-Dawley; D018091:Receptors, AMPA / Q000037:antagonists & inhibitors / Q000502:physiology*; D026941:Sodium Channel Blockers; D015222:Sodium Channels / Q000502:physiology*; D013574:Synaptosomes / Q000187:drug effects / Q000502:physiology; D014701:Veratridine / Q000494:pharmacology; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / Q000494:pharmacology
chemical_list: D014151:Anti-Anxiety Agents; D000927:Anticonvulsants; D001496:Batrachotoxins; D018696:Neuroprotective Agents; D010069:Oxadiazoles; D018091:Receptors, AMPA; D026941:Sodium Channel Blockers; D015222:Sodium Channels; C061950:GYKI 52466; D001569:Benzodiazepines; D008801:Mexiletine; D018698:Glutamic Acid; D014701:Veratridine; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; C119322:irampanel