环金属化Ir (III) 复合体的光催化抗癌活性:一个机械的洞察力
Ashish Kumar Yadav1, Virendra Singh2, Ishwar Singh1
1Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh, 221005, India.
Chemistry, an Asian journal
|July 21, 2025
概括
三种新型的 (III) 复合物在癌症治疗中显示出有前途. 它们在可见光下有效氧化NADH,并通过ROS生成和亡诱导癌细胞死亡,对健康细胞的毒性最小.
科学领域:
- 有机金属化学 有机金属化学
- 光催化作用的光催化
- 癌症治疗方法 癌症治疗方法
背景情况:
- 循环金属化 (III) 复合物正在探索用于光动力学疗法.
- 为癌症治疗开发高效的光催化剂至关重要.
研究的目的:
- 合成和描述新型环金属化 ((III) 复合物.
- 评估它们作为可见光介导光催化剂在癌症治疗中的有效性.
- 研究它们在癌细胞中的作用机制.
主要方法:
- 三种新型Ir(III) 复合体 (Ir1-Ir3) 的合成和表征.
- 在可见光下评估NADH氧化效率.
- 对A549肺腺癌细胞和HEK-293细胞的光细胞毒性评估.
- 涉及活性氧物种 (ROS) 生成,线粒体膜潜力和亡试验的机制研究.
主要成果:
- 在350-480nm范围内,Ir1-Ir3表现出吸收.
- 在可见光下,NADH氧化 (499-698h-1) 的高效率.
- 在A549细胞中显著的光细胞毒性,其中Ir3是最强的.
- Ir3对HEK-293细胞的暗光毒性是可以忽略不计的.
- 机理学研究证实了ROS生成 (I型和II型) 和通过线粒体去极化激活caspase-3/7依赖性亡.
结论:
- 伊尔3是一种强大的双作用光疗剂,用于治疗癌症.
- 它协同结合了I型和II型抗癌活性.
- 有效的NADH光氧化和光触发的ROS生成有助于其有效性.
- 这项研究为开发用于癌症治疗的多功能光催化剂提供了一个有希望的平台.
相关概念视频
Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.9K
Electron Transport Chain: Complex I and II
15.0K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
15.0K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.5K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.5K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
Thermal Electrocyclic Reactions: Stereochemistry
2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.1K
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)

![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)