01-12-2015 | Research Article
Dual-Modality Optical/PET Imaging of PARP1 in Glioblastoma
Published in: Molecular Imaging and Biology | Issue 6/2015
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Purpose
The current study presents [18F]PARPi-FL as a bimodal fluorescent/positron emission tomography (PET) agent for PARP1 imaging.
Procedures
[18F]PARPi-FL was obtained by 19F/18F isotopic exchange and PET experiments, biodistribution studies, surface fluorescence imaging, and autoradiography carried out in a U87 MG glioblastoma mouse model.
Results
[18F]PARPi-FL showed high tumor uptake in vivo and ex vivo in small xenografts (< 2 mm) with both PET and optical imaging technologies. Uptake of [18F]PARPi-FL in blocked U87 MG tumors was reduced by 84 % (0.12 ± 0.02 %injected dose/gram (%ID/g)), showing high specificity of the binding. PET imaging showed accumulation in the tumor (1 h p.i.), which was confirmed by ex vivo phosphor autoradiography.
Conclusions
The fluorescent component of [18F]PARPi-FL enables cellular resolution optical imaging, while the radiolabeled component of [18F]PARPi-FL allows whole-body deep-tissue imaging of malignant growth.