title: Structure-activity analysis of a novel NR2C/NR2D-preferring NMDA receptor antagonist: 1-(phenanthrene-2-carbonyl) piperazine-2,3-dicarboxylic acid.
abstract: (2S*,3R*)-1-(biphenyl-4-carbonyl)piperazine-2,3-dicarboxylic acid (PBPD) is a moderate affinity, competitive N-methyl-d-aspartate (NMDA) receptor antagonist with an atypical pattern of selectivity among NMDA receptor 2 subunit (NR2) subunits. We now describe the activity of several derivatives of PBPD tested at both rat brain NMDA receptors using l-[3H]-glutamate binding assays and at recombinant receptors expressed in Xenopus oocytes. Substituting various branched ring structures for the biphenyl group of PBPD reduced NMDA receptor activity. However, substituting linearly arranged ring structures - fluorenone or phenanthrene groups - retained or enhanced activity. Relative to PBPD, the phenanthrene derivative (2S*, 3R*)-1-(phenanthrene-2-carbonyl)piperazine-2,3-dicarboxylic acid (PPDA) displayed a 30- to 78-fold increase in affinity for native NMDA receptors. At recombinant receptors, PPDA displayed a 16-fold (NR2B) to 94-fold (NR2C) increase in affinity over PBPD. Replacement of the biphenyl group of PBPD with a 9-oxofluorene ring system resulted in small changes in receptor affinity and subtype selectivity. 2'-Bromo substitution on the biphenyl group of PBPD reduced antagonist affinity 3- to 5-fold at NR2A-, NR2B- and NR2D-containing receptors, but had little effect on NR2C-containing receptors. In contrast, 4'-fluoro substitution of the biphenyl ring of PBPD selectively increased NR2A affinity. The aromatic rings of PBPD and PPDA increase antagonist affinity and appear to interact with a region of the NMDA receptor displaying subunit heterogeneity. PPDA is the most potent and selective NR2C/NR2D-preferring antagonist yet reported and thus may be useful in defining NR2C/NR2D function and developing related antagonists with improved NMDA receptor subtype selectivity. British Journal of Pharmacology (2004) 141, 508-516. doi:10.1038/sj.bjp.0705644
authors.affiliation: Department of Pharmacology, University of Nebraska Medical Center, Omaha, NE 68198-6260, U.S.A.
authors.forename: Bihua
authors.initials: B
authors.lastname: Feng
authors.forename: Heong W
authors.initials: HW
authors.lastname: Tse
authors.forename: Donald A
authors.initials: DA
authors.lastname: Skifter
authors.forename: Richard
authors.initials: R
authors.lastname: Morley
authors.forename: David E
authors.initials: DE
authors.lastname: Jane
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Monaghan
mesh_terms: D000818:Animals; D001713:Biphenyl Compounds / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D003979:Diazonium Compounds / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D003998:Dicarboxylic Acids / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D018691:Excitatory Amino Acid Antagonists / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D005260:Female; D008297:Male; D010616:Phenanthrenes / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D010879:Piperazines / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D011725:Pyridines / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors* / Q000378:metabolism; D013329:Structure-Activity Relationship; D014982:Xenopus laevis
chemical_list: C491996:(2S*,3R*)-1-(biphenyl-4-carbonyl)piperazine-2,3-dicarboxylic acid; D001713:Biphenyl Compounds; D003979:Diazonium Compounds; D003998:Dicarboxylic Acids; D018691:Excitatory Amino Acid Antagonists; C432823:NR2C NMDA receptor; C464436:NR2D NMDA receptor; D010616:Phenanthrenes; D010879:Piperazines; D011725:Pyridines; D016194:Receptors, N-Methyl-D-Aspartate; C056729:4-(2'-pyridyldithio)benzyldiazoacetate