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Graphene quantum dots in photodynamic therapy
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-09-17 , DOI: 10.1039/d0na00631a
Jiayi Chen 1 , Wentian Wu 2 , Fangwei Zhang 2 , Jiali Zhang 2 , Hui Liu 1 , Jing Zheng 1 , Shouwu Guo 2 , Jingyan Zhang 1
Affiliation  

Graphene quantum dots (GQDs) have shown great promise in a variety of medical applications. Recently, it has been found that GQDs are also beneficial for photodynamic therapy (PDT). However, the findings of GQDs as PDT agents have been controversial in the literature. Herein, we investigate the photoactivity of single-atomic-layered GQDs by examining their ability to generate singlet oxygen (1O2) under irradiation and their effects on the photoactivity of photosensitizers. We demonstrate that the GQDs with lateral sizes of ∼5 or 20 nm are photo-inactive for they cannot generate 1O2 under irradiation of either a 660 nm laser (105 mW cm−2) or a halogen light. Moreover, the GQDs inhibit the photoactivity of two classical photosensitizers, namely, methylene blue and methylene violet. The stronger interaction between the GQDs and the photosensitizer results in greater inhibition of GQDs. Besides, the large-sized GQDs exhibit stronger inhibition than the small-sized GQDs. The inhibitory effect of the GQDs on the photoactivity of photosensitizers is consistent with their photo-cytotoxicity. These results indicate that the single-atomic-layered GQDs are not potential PDT agents, but they may be helpful for photosensitizers by delivering them into the cells. The discrepancy between the current work and the literature is probably associated with the GQDs used.

中文翻译:


石墨烯量子点在光动力治疗中的应用



石墨烯量子点(GQD)在各种医疗应用中显示出巨大的前景。最近,人们发现GQDs也有益于光动力疗法(PDT)。然而,GQD 作为 PDT 药物的研究结果在文献中一直存在争议。在此,我们通过检查单原子层 GQD 在照射下产生单线态氧 ( 1 O 2 ) 的能力及其对光敏剂光活性的影响来研究单原子层 GQD 的光活性。我们证明横向尺寸为~5或20 nm的GQD具有光惰性,因为它们在660 nm激光(105 mW cm -2 )或卤素灯的照射下不能产生1 O 2 。此外,GQD 抑制两种经典光敏剂的光活性,即亚甲蓝和亚甲紫。 GQD 和光敏剂之间的相互作用越强,GQD 的抑制作用就越强。此外,大尺寸的GQDs比小尺寸的GQDs表现出更强的抑制作用。 GQDs对光敏剂光活性的抑制作用与其光细胞毒性一致。这些结果表明,单原子层 GQD 不是潜在的 PDT 制剂,但它们可能有助于将光敏剂递送到细胞中。当前工作与文献之间的差异可能与所使用的 GQD 有关。
更新日期:2020-10-13
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