光动力疗法
单线态氧
材料科学
酞菁
氧气
荧光
锰
量子点
肿瘤缺氧
纳米技术
碳纤维
光化学
化学
复合数
有机化学
光学
冶金
放射治疗
复合材料
内科学
物理
医学
作者
Qingyan Jia,Jiechao Ge,Weimin Liu,Xiuli Zheng,Shiqing Chen,Yongmei Wen,Hongyan Zhang,Pengfei Wang
标识
DOI:10.1002/adma.201706090
摘要
Recent studies indicate that carbon dots (CDs) can efficiently generate singlet oxygen (1 O2 ) 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 1 O2 (quantum yield of 0.40) but also highly catalyze H2 O2 to generate oxygen. These collective properties of the Mn-CD assembly enable it to be utilized as an acidic H2 O2 -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.
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