7-Azabicyclo[2.2.1]heptane as a structural motif to block mutagenicity of nitrosamines

Tomohiko Ohwada, Satoko Ishikawa, Yusuke Mine, Keiko Inami, Takahiro Yanagimoto, Fumika Karaki, Yoji Kabasawa, Yuko Otani, Masataka Mochizuki

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Nitrosamines are potent carcinogens and toxicants in the rat and potential genotoxins in humans. They are metabolically activated by hydroxylation at an α-carbon atom with respect to the nitrosoamino group, catalyzed by cytochrome P450. However, there has been little systematic investigation of the structure-mutagenic activity relationship of N-nitrosamines. Herein, we evaluated the mutagenicity of a series of 7-azabicyclo[2.2.1]heptane N-nitrosamines and related monocyclic nitrosamines by using the Ames assay. Our results show that the N-nitrosamine functionality embedded in the bicyclic 7-azabicylo[2.2.1]heptane structure lacks mutagenicity, that is, it is inert to α-hydroxylation, which is the trigger of mutagenic events. Further, the calculated α-C-H bond dissociation energies of the bicyclic nitrosamines are larger in magnitude than those of the corresponding monocyclic nitrosamines and N-nitrosodimethylamine by as much as 20-30 kcal/mol. These results are consistent with lower α-C-H bond reactivity of the bicyclic nitrosamines. Thus, the 7-azabicyclo[2.2.1]heptane structural motif may be useful for the design of nongenotoxic nitrosamine compounds with potential biological/medicinal applications.

本文言語English
ページ(範囲)2726-2741
ページ数16
ジャーナルBioorganic and Medicinal Chemistry
19
8
DOI
出版ステータスPublished - 2011 4 15

ASJC Scopus subject areas

  • 生化学
  • 分子医療
  • 分子生物学
  • 薬科学
  • 創薬
  • 臨床生化学
  • 有機化学

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