g-C3N4/MnO2光敏新系统在增强光动力治疗的探索
首发时间:2019-06-11
摘要:光动力疗法(PDT)是在氧存在下利用光照射光敏剂产生局部活性氧(ROS),达到对恶性细胞进行杀伤的治疗方式。PDT具有极小的侵袭性,无电离辐射,副作用低等优势,因而在肿瘤治疗中至关重要。然而,PDT在临床上还未广泛开展应用。一方面,因传统光敏剂固有缺陷,更理想的光学和生物学特性的高效光敏剂亟需发展。另一方面,肿瘤局部高浓度还原型谷胱甘肽(GSH)是降低PDT疗效的重要原因,这是由于GSH能够消耗大量PDT产生的单线态氧,从而降低PDT治疗的效果。因此,既能够作为高效光敏剂又可以在一定程度上降低肿瘤部位GSH水平的纳米体系的构建是增强光动力治疗的关键发展方向。本文采用一步简单的氧化还原法制备了石墨相碳氮化物与二氧化锰集成光敏新系统。该体系不仅具备g-C3N4纳米片成本低、毒性低、制备方便、高稳定性、开启荧光响应且易于运送其他功能体系等的优点,而且负载了能够通过消耗肿瘤组织GSH,抑制单线态氧水平降低的MnO2。由于MnO2在g-C3N4上原位负载,充分发挥了光敏剂和增效剂的集成优势,为增强型光动力癌症治疗提供了一种极具潜力的体系。
关键词: 石墨相碳氮化物 二氧化锰 光敏体系 增强型光动力 谷胱甘肽
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Exploration of g-C3N4/MnO2 new photosensitizer system in enhanced photodynamic therapy
Abstract:Photodynamic therapy (PDT) is a method of killing malignant cells by using light-irradiated photosensitizer system to produce local reactive oxygen such as singlet oxygen (1O2) in the presence of oxygen. PDT is characterized by small invasiveness, no ionizing radiation, and low side effects, which is essential for cancer treatment. However, PDT has not been widely used in clinic. On one hand, traditional photosensitizers are inherently flawed, and more desirable optical and biological properties of highly effective photosensitizers are in urgent need of development. On the other hand, high concentration of reduced glutathione (GSH) in tumor sites is a key reason to reduce the curative effect of PDT, which is due to the fact that the GSH can consume a large amount of singlet oxygen produced by PDT, thus reducing the effect of PDT treatment. Therefore, constructing a nanosystem that can be used as a highly effective photosensitizer and reduce the GSH level of tumor sites is an important method to solve this problem. Therefore, in this paper, a new g-C3N4/MnO2 integrated photosensitizer system is prepared by a simple one-step redox method. This system not only has the advantages of low cost, low toxicity, convenient preparation, high stability, turn on fluorescence response and easy transportation of other functional materials, but also can consume GSHin tumor tissue. MnO2 with maximum inhibition of the decrease of singlet oxygen level due to the in-situ integration of MnO2 on g-C3N4, the advantages of photosensitizer and synergistic agent are brought into full play, and a potential system for enhanced photodynamic cancer treatment is provided.
Keywords: g-C3N4 manganese dioxide photosensitizer system enhanced photodynamic therapy glutathione
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g-C3N4/MnO2光敏新系统在增强光动力治疗的探索
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