{CoNO}8複合体からのNO−の陽子誘発反応性
Melody A Rhine1, Andria V Rodrigues, Ramona J Bieber Urbauer
1Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , Athens, Georgia 30602, United States.
Journal of the American Chemical Society
|July 30, 2014
まとめ
研究者らは,酸によって活性化されるとニトロキシル (HNO) ドナーとして作用するコバルト-ニトロシル複合体を開発した. このブレークスルーは,潜在的な治療用途のためにHNOを供給するための新しい経路を提供します.
科学分野:
- 無機化学 無機化学とは
- 薬用化学 薬用化学について
- バイオ・オーガニック化学 バイオ・オーガニック化学
背景:
- 酸化窒素 (NO) の還元形であるニトロキシル (HNO) は,治療的可能性を示していますが,非常に不安定です.
- 安定したHNOドナー分子の開発は,その臨床応用にとって極めて重要です.
- メタルニトロシル (MNO) 複合体は,潜在的なHNO配送システムとして調査されています.
研究 の 目的:
- 潜在的なHNOドナー能力を持つ新しいコバルトニトロシル複合体を合成し,特徴づけること.
- 生物学的標的を持つ合成複合体のHNO放出特性を調査する.
- コバルト・ニトロシル複合体の反応性と安定性を調査する.
主な方法:
- ピロール/イミネ・リガンドの枠組み内の{CoNO}(8) 複合体の合成とスペクトル/構造的特徴付け.
- コンプレクスのHNOドナー活動を,鉄 (III) ヘメスとトリフェニルフォスフィン (Ph3P) のような確立されたHNOターゲットでテストする.
- 酸の存在,標的の欠如,酸素との反応を含む様々な条件下で反応製品を調査する.
主要な成果:
- {CoNO}(8) コンプレックス [Co(LN4(PhCl))(NO) ] (1) は,Fe(III) ヘメスまたはPh3Pと直接反応しなかった.
- 複合体1は,ステキオメトリックH+の存在下でHNOドナーの行動を示した.
- 複合体はHNOを[Fe(TPP) Cl]とPh3Pに順調に転送し,それぞれ{FeNO}(7) ポルフィリンとPh3PO/Ph3PNHを形成した.
- ターゲットの欠如により,ディニトロシル複合体 (3) が形成された. O2との反応により,窒素酸ナロゲン (2) が生成された.
結論:
- この研究では,最初の{CoNO}(8) 複合体がHNOドナーとして機能し,特にFe(III) -ポルフィリンなどの生物学的標的に対して,プロトネーション時に機能していることが報告されています.
- この発見は,治療戦略のための金属ベースのHNOドナー剤の設計に新たな道を開く.
- 反応性プロファイルは,金属ニトロシル複合体からのHNO放出を制御する反応条件の重要性を強調しています.
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