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Ru(II) 在光动力学治疗窗口中具有吸收的复合物:敏感化,DNA结合和等离子体DNA光分离
Sean J Steinke1, Marilyn N Dunbar1, M Agustina Amalfi Suarez1
1Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.
Inorganic chemistry
|June 1, 2024
概括
(II) 复合物与比西米达配体显示光动力学治疗的红移吸收. 这些复合物有效地与DNA结合,并在辐射时分裂,产生单片氧,用于潜在的治疗应用.
科学领域:
- 协调化学 协调化学
- 摄影化学的使用.
- 生物物理化学 生物物理化学
背景情况:
- 由于其光物理性质, (II) 复合体正在研究其在光动力疗法 (PDT) 中的潜力.
- 调整Ru(II) 复合体中的联体的电子特性可以改变它们的吸收光谱和激发状态寿命,这对于PDT应用至关重要.
- 了解DNA结合和光分裂机制对于开发有效的基于Ru (II) 的治疗剂至关重要.
研究的目的:
- 为了合成和描述新型的 (((II) 复合物,其中包括3- ((pyrid-2'-yl) -4,5,9,16-tetraaza-dibenzo[a,c]naphthacene (pydppn) 和bisimidazole连接物.
- 评估和比较这些新复合物的光物理性质,DNA结合方式和DNA光分裂活动.
- 通过分析它们在PDT窗口和单点氧气生成中的吸收来评估这些复合物的光动力学治疗潜力.
主要方法:
- 合成和描述两个新的Ru (II) 复合物:[Ru (pydppn) (bim) (py) ]2+ (2) 和[Ru (pydppn) (Me4bim) (py) ]2+ (3).
- 光谱分析包括UV-Vis吸收和短暂吸收光谱,以确定光物理性质.
- 使用吸收定位,热变性,粘度测量和循环二元化进行DNA结合研究.
- 在可见光和红光照射下,使用等离子体pUC19 DNA进行DNA光裂测定.
主要成果:
- 综合体2和3展示了红移金属至配体电荷转移 (MLCT) 波段,延伸到800 nm,归因于π-捐赠的比西米达配体.
- 一个长期存在的兴奋状态 (大约. 观察到1的19μs和2,3的270ns,分配给一个以pydppn为中心的3ππ*状态.
- 来自多种技术的证据表明,pydppn连接体被插入DNA.
- 在照射后观察到等离子体DNA的高效光分离,其介导是单片氧 (1O2) 的敏感生成.
结论:
- 合成的Ru(II) 复合物与比西米达配体显示了适合光动力学治疗窗口 (600-900 nm) 的吸收概况.
- 这些复合物有效地通过介质与DNA结合,并通过单片氧生成诱导DNA光分裂.
- 这些发现突出了这些Ru(II) 复合物的潜力,作为光动力学治疗的光敏化剂,利用它们的扩展吸收和高效的细胞毒性单片氧生产.
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