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• W2072273152 abstract "Glioma-targeting micelles for optical/magnetic resonance dual-mode imaging Qing Zhou,1,* Ketao Mu,2,* Lingyu Jiang,1 Hui Xie,3 Wei Liu,1 Zhengzheng Li,1 Hui Qi,1 Shuyan Liang,1 Huibi Xu,1 Yanhong Zhu,1 Wenzhen Zhu,2 Xiangliang Yang11National Engineering Research Center for Nanomedicine, College of Life Science and Technology, 2Radiology Department, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 3Department of Information Processing, China Patent Information Center, Wuhan, People’s Republic of China*These authors contributed equally to this workAbstract: Surgical resection is the primary mode for glioma treatment, while gross total resection is difficult to achieve, due to the invasiveness of the gliomas. Meanwhile, the tumor-resection region is closely related to survival rate and life quality. Therefore, we developed optical/magnetic resonance imaging (MRI) bifunctional targeted micelles for glioma so as to delineate the glioma location before and during operation. The micelles were constructed through encapsulation of hydrophobic superparamagnetic iron oxide nanoparticles (SPIONs) with polyethylene glycol-block-polycaprolactone (PEG-b-PCL) by using a solvent-evaporation method, and modified with a near-infrared fluorescent probe, Cy5.5, in addition to the glioma-targeting ligand lactoferrin (Lf). Being encapsulated by PEG-b-PCL, the hydrophobic SPIONs dispersed well in phosphate-buffered saline over 4 weeks, and the relaxivity (r2) of micelles was 215.4 mM–1·s–1, with sustained satisfactory fluorescent imaging ability, which might have been due to the interval formed by PEG-b-PCL for avoiding the fluorescence quenching caused by SPIONs. The in vivo results indicated that the nanoparticles with Lf accumulated efficiently in glioma cells and prolonged the duration of hypointensity at the tumor site over 48 hours in the MR image compared to the nontarget group. Corresponding with the MRI results, the margin of the glioma was clearly demarcated in the fluorescence image, wherein the average fluorescence intensity of the tumor was about fourfold higher than that of normal brain tissue. Furthermore, 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay results showed that the micelles were biocompatible at Fe concentrations of 0–100 µg/mL. In general, these optical/MRI bifunctional micelles can specifically target the glioma and provide guidance for surgical resection of the glioma before and during operation.Keywords: MRI, fluorescence image, micelles, lactoferrin, glioma" @default.
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• W2072273152 date "2015-03-01" @default.
• W2072273152 modified "2023-10-17" @default.
• W2072273152 title "Glioma-targeting micelles for optical/magnetic resonance dual-mode imaging" @default.
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• W2072273152 doi "https://doi.org/10.2147/ijn.s72910" @default.
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