Advanced Materials
Advanced Materials
5 years ago

A Magnetofluorescent Carbon Dot Assembly as an Acidic H2O2-Driven Oxygenerator to Regulate Tumor Hypoxia for Simultaneous Bimodal Imaging and Enhanced Photodynamic Therapy

A Magnetofluorescent Carbon Dot Assembly as an Acidic H2O2-Driven Oxygenerator to Regulate Tumor Hypoxia for Simultaneous Bimodal Imaging and Enhanced Photodynamic Therapy
Pengfei Wang, Xiuli Zheng, Hongyan Zhang, Yongmei Wen, Shiqing Chen, Weimin Liu, Jiechao Ge, Qingyan Jia
Recent studies indicate that carbon dots (CDs) can efficiently generate singlet oxygen (1O2) for photodynamic therapy (PDT) of cancer. However, the hypoxic tumor microenvironment and rapid consumption of oxygen in the PDT process will severely limit therapeutic effects of CDs due to the oxygen-dependent PDT. Thus, it is becoming particularly important to develop a novel CD as an in situ tumor oxygenerator for overcoming hypoxia and substantially enhancing the PDT efficacy. Herein, for the first time, magnetofluorescent Mn-CDs are successfully prepared using manganese(II) phthalocyanine as a precursor. After cooperative self-assembly with DSPE-PEG, the obtained Mn-CD assembly can be applied as a smart contrast agent for both near-infrared fluorescence (FL) (maximum peak at 745 nm) and T1-weighted magnetic resonance (MR) (relaxivity value of 6.97 mM−1 s−1) imaging. More interestingly, the Mn-CD assembly can not only effectively produce 1O2 (quantum yield of 0.40) but also highly catalyze H2O2 to generate oxygen. These collective properties of the Mn-CD assembly enable it to be utilized as an acidic H2O2-driven oxygenerator to increase the oxygen concentration in hypoxic solid tumors for simultaneous bimodal FL/MR imaging and enhanced PDT. This work explores a new biomedical use of CDs and provides a versatile carbon nanomaterial candidate for multifunctional nanotheranostic applications. A magnetofluorescent Mn-CD assembly is designed and prepared as an acidic H2O2-driven oxygenerator to regulate the hypoxic tumor microenvironment for simultaneous bimodal fluorescence/T1-weighted magnetic resonance imaging and enhanced photodynamic therapy of solid tumors. This work demonstrates a new biomedical use of CDs and provides a versatile carbon nanomaterial candidate for multifunctional nanotheranostic applications.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201706090

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