磁共振成像
纳米团簇
聚乙二醇
纳米颗粒
材料科学
PEG比率
纳米笼
关节炎
氧化铁纳米粒子
激光器
辐照
核磁共振
化学
生物医学工程
纳米技术
医学
光学
有机化学
催化作用
经济
核物理学
免疫学
放射科
物理
财务
作者
Xin Li,Shi-Yi Lu,Zuogang Xiong,Yong Hu,Dan Ma,Wenqi Lou,Chen Peng,Mingwu Shen,Xiangyang Shi
标识
DOI:10.1002/advs.201901800
摘要
Design of novel nanoplatforms with single imaging elements for dynamic and enhanced T1/T2-weighted magnetic resonance (MR) imaging of diseases still remains significantly challenging. Here, a facile strategy to synthesize light-addressable ultrasmall Fe3O4 nanoparticles (NPs) that can form nanoclusters (NCs) under laser irradiation for enhanced and dynamic T1/T2-weighted MR imaging of inflammatory arthritis is reported. Citric acid-stabilized ultrasmall Fe3O4 NPs synthesized via a solvothermal approach are linked with both the arthritis targeting ligand folic acid (FA) and light-addressable unit diazirine (DA) via polyethylene glycol (PEG) spacer. The formed ultrasmall Fe3O4-PEG-(DA)-FA NPs are cytocompatible, display FA-mediated targeting specificity to arthritis-associated macrophage cells, and can form NCs upon laser irradiation to have tunable r1 and r2 relaxivities by varying the laser irradiation duration. With these properties owned, the designed Fe3O4-PEG-(DA)-FA NPs can be used for T1-weighted MR imaging of arthritis without lasers and enhanced dual-mode T1/T2-weighted MR imaging of arthritis under laser irradiation due to the formation of NCs that have extended accumulation within the arthritis region and limited intravasation back to the blood circulation. The designed light-addressable Fe3O4-PEG-(DA)-FA NPs may be used as a promising platform for dynamic and precision T1/T2-weighted MR imaging of other diseases.
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