Chemical properties of the ultimate metabolites of 2-amino-5-phenylpyridine (PHE-P-1) and its ortho-methyl derivative.
The reactivity of the N-acetoxy metabolite of 2-amino-5-phenylpyridine (Phe-P-1), a pyrolysis product of phenylalanine, towards 2'-deoxyguanosine (dG), 2'-deoxyguanosine-3'-monophosphate (dGMP) and DNA was studied and compared with that of the ortho-methyl derivative. Reaction of 2-acetoxyamino-5-phenylpyridine (N-OAc-APP) with dG resulted in substitution at the 8-position of this nucleoside by the ortho carbon of the amine. The major reaction, however, was acetylation of dG. In contrast, 2-acetoxyamino-3-methyl-5-phenyl-pyridine (N-OAc-MeAPP) mainly attacked the 8-position of dG by the exocyclic nitrogen and hardly any acetylation of the nucleoside occurred. The adducts were chromatographically isolated and characterized by their mass and NMR spectra. Upon reaction of N-acetoxy compounds with DNA and dGMP, formation of the same adducts was observed, besides the formation of minor amounts of unidentified compounds, as was established by 32P-postlabelling analysis. The amount of DNA-bound amine, formed by the interaction of N-OAc-APP with DNA, was approximately 15 times smaller than that observed after the reaction with the corresponding ortho-methyl derivative under the same conditions.
Saris
C P
CP
Netherlands Cancer Institute, Division of Molecular Carcinogenesis, Amsterdam.
van Dijk
W J
WJ
Westra
J G
JG
Hamzink
M R
MR
van de Werken
G
G
Zomer
G
G
Stavenuiter
J F
JF
D000631:Aminopyridines / Q000378:metabolism* / Q000633:toxicity*; D000818:Animals; D002273:Carcinogens / Q000378:metabolism* / Q000633:toxicity*; D002417:Cattle; D002853:Chromatography, Liquid; D018736:DNA Adducts / Q000096:biosynthesis; D004249:DNA Damage; D003848:Deoxyguanine Nucleotides / Q000378:metabolism; D003849:Deoxyguanosine / Q000378:metabolism; D013058:Mass Spectrometry; D013329:Structure-Activity Relationship
D000631:Aminopyridines; D002273:Carcinogens; D018736:DNA Adducts; D003848:Deoxyguanine Nucleotides; C092749:2-amino-3-methyl-5-phenylpyridine; C044515:5-phenyl-2-pyridinamine; C007257:2'-deoxyguanosine 5'-phosphate; D003849:Deoxyguanosine