Journal
ACS NANO
Volume 8, Issue 8, Pages 8438-8446Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn502950t
Keywords
Cu-64 labeling; chelator free; PET; image-guided photothermal therapy
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Funding
- Intramural Research Program (IRP) of the NIBIB, NIH
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Using positron emission tomography (PET) imaging to monitor and quantitatively analyze the delivery and localization of Au nanomaterials (NMs), a widely used photothermal agent, is essential to optimize therapeutic protocols to achieve individualized medicine and avoid side effects. Coupling radiometals to Au NMs via a chelator faces the challenges of possible detachment of the radiometals as well as surface property changes of the NMs. In this study, we reported a simple and general chelator-free Cu-64 radiolabeling method by chemically reducing Cu-64 on the surface of polyethylene glycol (PEG) stabilized Au NMs regardless of their shape and size. Our Cu-64 integrated NMs are proved to be radiochemically stable and can provide an accurate and sensitive localization of NMs through noninvasive PET imaging. We further integrated Cu-64 onto arginine-glycine-aspartic acid (RGD) peptide modified Au nanorods (NRs) for tumor theranostic application. These NRs showed high tumor targeting ability in a U87MG glioblastoma xenograft model and were successfully used for PET image-guided photothermal therapy.
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