Pd-bacteriopheophorbideによる活性酸素種の生成に対するマイクロ環境の影響
Yahel Vakrat-Haglili1, Lev Weiner, Vlad Brumfeld
1Department of Plant Sciences, Weizmann Institute of Science, Rehovot, Israel.
Journal of the American Chemical Society
|April 28, 2005
まとめ
環境は,光ダイナミックセラピー (PDT) 染料による反応性酸素種 (ROS) 生成に大きく影響する. Pd-bacteriopheophorbideは,有機環境と水性環境では異なるROSを生成し,PDTの有効性に影響します.
科学分野:
- フォトケミストリー フォトケミストリー
- バイオフィジックス 生物物理学
- 薬用化学 薬用化学について
背景:
- 反応性酸素種 (ROS) は,生物学的プロセスと光ダイナミック療法 (PDT) で極めて重要です.
- 染料の環境は,PDT中のROSの生成と有効性に影響します.
- Pd-bacteriopheophorbide (Pd-Bpheid),血管を標的とするPDT剤 (WST09/TOOKAD) は,臨床試験中である.
研究 の 目的:
- 染料の環境が,Pd-Bpheid.によって生成されるROSの産出量,運命を,および有効性をどのように影響するか調査する.
- 異なる介質におけるROS形成のメカニズムを解明する.
主な方法:
- 時間解像度 (ピコ・ナノ秒) のスペクトルスコピー
- スピントラップを使った電子スピン共振 (ESR) 光譜法.
- 時間の解像度のあるシングレット酸素光化.
- 化学製品分析 化学製品分析
主要な成果:
- Pd-Bpheidは水中媒体でヒドロキシルラジカル,スーパーオキシードラジカル,そして過酸化水素を生成します.
- 有機溶剤では,Pd-Bpheidは単離酸素のみを形成する.
- シングレット酸素量子産量は,有機溶剤では1~から,膜のようなシステム (ミセル,リポソーム) では0.5~に減少する.
- スーパーオキシードとヒドロキシルラジカルは,膜のようなシステムで0.1%の量子収量で形成されます.
- ラジカル形成は,膜/水界面の興奮したPd-Bpheidから電子と陽子の移転を伴う.
結論:
- 環境はPd-BpheidによるROS生成を決定的に制御し,PDTの結果に影響を与えます.
- 近赤外線 (NIR) でROSを生成するバクテリオクロロフィール派生体は,PDTと酸化還元調節の研究に新しい可能性を提供します.
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