遺伝子毒性C8-アリラミノ-2'-デオキシアデノシンは,DNAインターストランドクロスリンクを誘導する潜在的アルキル化剤として作用する
Aaron L Rozelle1,2, Seongmin Lee1
1Division of Chemical Biology and Medicinal Chemistry, College of Pharmacy, The University of Texas at Austin, Austin, Texas 78712, United States.
Journal of the American Chemical Society
|November 2, 2021
まとめ
ポリサイクリックアロマティックアミンは,酸化ストレス下での8 - アリラミノ-2'-デオキシアデノシン病変を酸化することによって,新しい遺伝子毒性メカニズムを明らかにすることによって,DNAの鎖間クロスリンク (ICL) を引き起こします.
科学分野:
- 分子生物学
- 遺伝学
- 環境 健康
背景:
- ICLは有害なDNA病変で ファンコーニ貧血のような遺伝疾患を引き起こす可能性があります
- 酸化ストレスとポリサイクルアロマティックアミンはICLの疑わしい原因ですが,特定のメカニズムと作用因子はまだ十分に理解されていません.
研究 の 目的:
- アリラミノ2デオキシアデノシン (ArNHdA) による病変が酸化条件下でICLを生成できるかどうかを調査する.
- これらの病変によって誘発されるICL形成の化学経路と特異性を明らかにする.
主な方法:
- 8- アリラミノ2 - デオキシアデノシン病変の活性酸素種 (ROS),特にニトロソペロキシカーボネートへの暴露
- 特定のアリラミノ発がん物質 (ビフェニル,フッ素) とDNA塩基 (アデニン,グアニン) を用いてICL形成の分析.
- ArNHdAをダイミノアデニン中間体に酸化する反応機構を提案した.
主要な成果:
- 8- アリラミノ - 2 - デオキシアデノシン病変は,酸化条件下でICLを形成する潜在的クロスリンク剤として作用する.
- 8アミノアデニンからICL形成が観察されたが,8アミノグアニンからICL形成は観察されず,ベース特異性を示した.
- この研究は,ROSとアリラミノ発がん物質を含む新しいクロスリンク化学を特定した.
結論:
- 8 - アリラミノ2 - デオキシアデノシン媒介ICLは,ROS誘発型および多循環性アロマティックアミン誘発型ICLの新しいクラスです.
- これらの発見は,アリラミノ発がん剤の遺伝子毒性作用を明らかにし,酸化ストレス誘発ICLにおけるC8変異アデニンの役割を強調する.
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