title: YF476 is a new potent and selective gastrin/cholecystokinin-B receptor antagonist in vitro and in vivo.
abstract: BACKGROUND
  We newly synthesized YF476 ((R)-1-[2,3-dihydro-2-oxo-1-pivaloylmethyl-5-(2'-pyridyl)-1H-1, 4benzodiazepin-3-yl]-3-(3-methylamino-phenyl)urea) as a gastrin/cholecystokinin-B (CCK-B) receptor antagonist. We investigated the pharmacological profile of YF476 in vitro and in vivo.
  
  
  METHODS
  We examined the binding properties of YF476 to the rat brain, cloned canine and cloned human gastrin/CCK-B receptors, and the effect of YF476 on secretagogue-induced gastric acid secretion in rats and Heidenhain pouch dogs.
  
  
  RESULTS
  YF476 replaced the specific binding of [125I]CCK-8 to the rat brain, cloned canine and cloned human gastrin/CCK-B receptors, with Ki values of 0.068, 0.62 and 0.19 nM, respectively. The affinity of YF476 for rat brain gastrin/CCK-B receptor was 4100-fold higher than that for rat pancreatic CCK-A receptor. In anaesthetized rats, intravenous YF476 inhibited pentagastrin-induced acid secretion with an ED50 value of 0.0086 micromol/kg, but did not affect histamine- and bethanechol-induced acid secretion at a dose of 10 micromol/kg. In Heidenhain pouch dogs, intravenous and oral YF476 inhibited pentagastrin-stimulated gastric acid secretion in a dose-dependent manner with ED50 values of 0.018 and 0.020 micromol/kg, respectively, but did not affect histamine-induced acid secretion.
  
  
  CONCLUSIONS
  These results suggest that YF476 is an extremely potent and highly selective gastrin/CCK-B receptor antagonist, and that the gastrin/CCK-B receptor is not involved in histamine- or bethanechol-induced gastric acid secretion in dogs or rats.
authors.affiliation: Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co. Ltd, Ibaraki, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takinami
authors.forename: H
authors.initials: H
authors.lastname: Yuki
authors.forename: A
authors.initials: A
authors.lastname: Nishida
authors.forename: S
authors.initials: S
authors.lastname: Akuzawa
authors.forename: A
authors.initials: A
authors.lastname: Uchida
authors.forename: Y
authors.initials: Y
authors.lastname: Takemoto
authors.forename: M
authors.initials: M
authors.lastname: Ohta
authors.forename: M
authors.initials: M
authors.lastname: Satoh
authors.forename: G
authors.initials: G
authors.lastname: Semple
authors.forename: K
authors.initials: K
authors.lastname: Miyata
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001570:Benzodiazepinones / Q000378:metabolism / Q000494:pharmacology*; D001921:Brain / Q000378:metabolism*; D019556:COS Cells; D004285:Dogs; D005744:Gastric Acid / Q000378:metabolism; D005753:Gastric Mucosa / Q000187:drug effects* / Q000378:metabolism; D006727:Hormone Antagonists / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D008297:Male; D051379:Mice; D010179:Pancreas / Q000378:metabolism; D010418:Pentagastrin / Q000037:antagonists & inhibitors*; D010671:Phenylurea Compounds / Q000378:metabolism / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D043887:Receptor, Cholecystokinin B; D011949:Receptors, Cholecystokinin / Q000037:antagonists & inhibitors* / Q000378:metabolism; D012844:Sincalide / Q000378:metabolism; D013237:Stereoisomerism
chemical_list: D001570:Benzodiazepinones; D006727:Hormone Antagonists; D010671:Phenylurea Compounds; D043887:Receptor, Cholecystokinin B; D011949:Receptors, Cholecystokinin; D010418:Pentagastrin; C104428:YF 476; D012844:Sincalide