title: Quantitative assessment of the metabolic activation of alicyclic amines via aldehyde.
abstract: BACKGROUND
  Recently it has been reported that some drugs that produce reactive intermediates may cause clinical adverse effects following covalent binding to biomacromolecules. For example, Schiff base production mediated by aldehyde is a possible mechanism of drug-protein adducts. However, because thiols do not trap aliphatic aldehydes via hemiacetal or hemiaminal, the glutathione-trapping method cannot be used to determine the covalent bindings of the Schiff base.
  
  
  METHODS
  We established a quantitative method to determine covalent binding mediated by aldehydes via hemiaminal or hemiacetal using non-radiolabeled compound and [(14)C]semicarbazide as a hard-trap agent with unique post-incubation.
  
  
  RESULTS
  The trapped aldehyde obtained from the post-incubation was almost equivalent to the covalent binding of the radiolabeled tool compound. Our novel method showed its usefulness in quantitative detection of aldehyde's covalent binding ability by several reagents with alicyclic amine and launched drugs as control.
  
  
  CONCLUSIONS
  The post-incubation method is useful for screening newly synthesized compounds to quantitatively assess the bioactivation of aldehydes descending from alicyclic amines.
authors.affiliation: Discovery Research Laboratories, Kyorin Pharmaceutical Co., Ltd., Tochigi, Japan. masahiro.miura@mb.kyorin-pharm.co.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Miura
authors.forename: Wataru
authors.initials: W
authors.lastname: Hori
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Kasahara
authors.forename: Ippei
authors.initials: I
authors.lastname: Nakagawa
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D000588:Amines / Q000378:metabolism*; D000818:Animals; D001711:Biotransformation; D002851:Chromatography, High Pressure Liquid; D004285:Dogs; D004353:Drug Evaluation, Preclinical / Q000379:methods*; D006840:Hydrocarbons, Alicyclic / Q000378:metabolism*; D008862:Microsomes, Liver / Q000378:metabolism; D015394:Molecular Structure; D051381:Rats; D012663:Semicarbazides / Q000737:chemistry; D052616:Solid Phase Extraction; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry; D013997:Time Factors
chemical_list: D000447:Aldehydes; D000588:Amines; D006840:Hydrocarbons, Alicyclic; D012663:Semicarbazides