title: 6,7-Dichloro-3-hydroxy-2-quinoxalinecarboxylic acid is a relatively potent antagonist at NMDA and kainate receptors.
abstract: The 6,7-dichloro derivative of 3-hydroxy-2-quinoxalinecarboxylic acid (diCl-HQC) is a relatively potent antagonist at the two excitatory amino acid receptor subtypes activated by N-methyl-D-aspartate (NMDA) and kainic acid. It antagonizes NMDA-induced excitation in the frog spinal cord (pA2 5.8), i.e. with a potency similar to D-2-amino-7-phosphonoheptanoate (D-AP-7). It also antagonizes NMDA-induced sodium efflux from rat brain slices (pA2 5.6). The compound inhibits kainic acid-induced sodium efflux from rat brain slices with a pA2 of 5.4 and it inhibits [3H]kainic acid binding to rat brain membranes with a pKi of 5.4. DiCl-HQC is only weakly active at the quisqualate receptor. This spectrum of activities may make this compound a useful tool to investigate the pharmacology of excitatory amino acid receptors.
authors.affiliation: Sandoz Research Institute, Berne, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Frey
authors.forename: D
authors.initials: D
authors.lastname: Berney
authors.forename: P L
authors.initials: PL
authors.lastname: Herrling
authors.forename: W
authors.initials: W
authors.lastname: Mueller
authors.forename: S
authors.initials: S
authors.lastname: Urwyler
mesh_terms: D000818:Animals; D001681:Biological Assay; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism*; D066298:In Vitro Techniques; D007608:Kainic Acid / Q000378:metabolism; D010069:Oxadiazoles / Q000378:metabolism; D011810:Quinoxalines / Q000378:metabolism*; D016318:Quisqualic Acid; D051381:Rats; D018092:Kainic Acid Receptors; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter / Q000187:drug effects / Q000378:metabolism*
chemical_list: D007608:Kainic Acid; D010069:Oxadiazoles; D011810:Quinoxalines; D016318:Quisqualic Acid; D018092:Kainic Acid Receptors; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter; C057665:6,7-dichloro-3-hydroxy-2-quinoxalinecarboxylic acid