title: [(3)H]-girisopam, a novel selective benzodiazepine for the 2, 3-benzodiazepine binding site.
abstract: Several members of the 2,3-benzodiazepine family, such as tofisopam (Grandaxin((R))) nerisopam (GYKI-52 322) [F. Andrási, K. Horváth, E. Sineger, P. Berzsenyi, J. Borsy, A. Kenessey, M. Tarr, T. Láng, J. Korösi, T. Hámori, Neuropharmacology of a new psychotropic 2, 3-benzodiazepine, Arzneim.-Forsch. Drug. Res., 37 (1987) 1119-1124.] [1] or girisopam (GYKI-51 189) [K. Horváth, F. Andrási, P. Berzsenyi, M. Pátfalusi, M. Patthy, G. Szabó, L. Sebestyén, J. Korösi, P. Botka, T. Hámori, T. Láng, A new psychoactive 5H-2, 3-benzodiazepine with a unique spectrum of activity, Arzneim.-Forsch. Drug. Res., 39 (1989) 894-899.] [2] proved anxiolytic in man and various animal models. Moreover, girisopam could also be characterized as an atypical neuroleptic agent. In spite of the structural similarity, their pharmacological profiles differ significantly from that of the 'classical' 1,4-benzodiazepines. Importantly, according to the data obtained so far these drugs do not have an addiction potential. The novel 2,3-benzodiazepine antagonist girisopam binds with high affinity (K(d)=10.3+/-1.21 nM) and limited capacity (B(max)=6.94+/-1.8 pmol/mg protein) to a single class of recognition sites in rat striatum [J.E. Horváth, J. Hudák, M. Palkovits, Zs. Lenkei, M.I.K. Fekete, P. Arányi, A novel specific binding site for homophthalazines (formerly 2, 3-benzodiazepines) in the rat brain, Eur. J. Pharmacol., 236 (1993) 151-153.]. This protocol describes the use of [(3)H]-girisopam as a specific radioligand for the 2,3-benzodiazepines receptor.
authors.affiliation: Institute for Drug Research, H-1325, Budapest, PO Box 82, Hungary.
authors.forename: E J
authors.initials: EJ
authors.lastname: Horváth
authors.forename: C
authors.initials: C
authors.lastname: Salamon
authors.forename: A
authors.initials: A
authors.lastname: Bakonyi
authors.forename: M I
authors.initials: MI
authors.lastname: Fekete
authors.forename: M
authors.initials: M
authors.lastname: Palkovits
mesh_terms: D000328:Adult; D000818:Animals; D014151:Anti-Anxiety Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D014150:Antipsychotic Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D001569:Benzodiazepines; D001665:Binding Sites / Q000187:drug effects; D001667:Binding, Competitive; D003342:Corpus Striatum / Q000187:drug effects* / Q000378:metabolism; D003975:Diazepam / Q000378:metabolism; D004298:Dopamine / Q000378:metabolism; D005445:Flunitrazepam / Q000378:metabolism; D005973:Glutamine / Q000378:metabolism; D006801:Humans; D008297:Male; D009928:Organ Specificity; D011485:Protein Binding; D011869:Radioligand Assay; D051381:Rats; D017207:Rats, Sprague-Dawley; D011963:Receptors, GABA-A / Q000187:drug effects*; D012701:Serotonin / Q000378:metabolism; D013329:Structure-Activity Relationship; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D014151:Anti-Anxiety Agents; D014150:Antipsychotic Agents; D011963:Receptors, GABA-A; D005973:Glutamine; D001569:Benzodiazepines; C061627:Nerisopam; C045445:girisopam; D012701:Serotonin; D005680:gamma-Aminobutyric Acid; D005445:Flunitrazepam; D003975:Diazepam; C012582:tofisopam; D004298:Dopamine