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- W2087793759 abstract "A fabrication method of Cy5.5-MMP substrate and PEG conjugated iron oxide nanoparticles with thin silica coating (PCM-CS) and its potential as an ‘activatable’ dual imaging probe for tumor imaging is described in this report. PCM-CS showed an intensity-averaged diameter of 43.1 ± 6.3 nm by dynamic light scattering without any noticeable aggregation over 7 days. Fluorescence of Cy5.5 on the surface of nanoparticles was fully quenched and the quenching efficiency was 97.2%. PCM-CS showed protease specific fluorescence recovery in vitro caused from the specific peptide cleavage by MMP-2 and the probe displayed the sensitivity on 0.5 nM or less enzyme concentration. Tumor was successfully visualized by NIRF and MRI in vivo by intravenously injected PCM-CS. NIRF signal of tumor was gradually increased up to 12 h post injection and the intensity of tumor was about 3–4 times higher than normal tissue. NIRF signal at MMP-2 inhibitor treated tumor was clearly lower than tumor without inhibitor due to the insufficient peptide cleavage. NIRF signal at excised tumor was 5–10 times stronger than other organs. Noticeable darkening in magnetic resonance image was observed at the tumor region and the image was gradually darkened at 12 h post injection of PCM-CS. The maximum signal difference between tumor region and healthy muscle was 34%." @default.
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- W2087793759 date "2011-10-01" @default.
- W2087793759 modified "2023-09-27" @default.
- W2087793759 title "Development of MRI/NIRF ‘activatable’ multimodal imaging probe based on iron oxide nanoparticles" @default.
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- W2087793759 doi "https://doi.org/10.1016/j.jconrel.2011.07.019" @default.
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