Abstract
Purpose
This study aims to develop a molecular imaging strategy for response assessment of arginine deiminase (ADI) treatment in melanoma xenografts using 3′-[18F]fluoro-3′-deoxythymidine ([18F]-FLT) positron emission tomography (PET).
Procedures
F-FLT response to ADI therapy was studied in preclinical models of melanoma in vitro and in vivo. The molecular mechanism of response to ADI therapy was investigated, with a particular emphasis on biological pathways known to regulate 18F-FLT metabolism.
Results
Proliferation of SK-MEL-28 melanoma tumors was potently inhibited by ADI treatment. However, no metabolic response was observed in FLT PET, presumably based on the known ADI-induced degradation of PTEN, followed by instability of the tumor suppressor p53 and a relative overexpression of thymidine kinase 1, the enzyme mainly responsible for intracellular FLT processing.
Conclusion
The specific pharmacological properties of ADI preclude using 18F-FLT to evaluate clinical response in melanoma and argue for further studies to explore the use of other clinically applicable PET tracers in ADI treatment.
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Acknowledgments
The authors would like to thank Dr. Marcus Kelly for his informative discussions and Megan Holz for her invaluable assistance. We also thank the staff of the Radiochemistry/Cyclotron Core at MSKCC. Technical services provided by the MSKCC Small-Animal Imaging Core Facility were supported in part by NIH grants R24 CA83084 and P30 CA08748. L.S. was supported by a grant (Ste 1837/1-1) of the Deutsche Forschungsgemeinschaft.
Conflict of Interest
J.S.B. is the Executive Vice President of Polaris Group that provided ADI-PEG 20 for this study. All other authors declare that they have no conflict of interest.
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Stelter, L., Fuchs, S., Jungbluth, A.A. et al. Evaluation of Arginine Deiminase Treatment in Melanoma Xenografts Using 18F-FLT PET. Mol Imaging Biol 15, 768–775 (2013). https://doi.org/10.1007/s11307-013-0655-6
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DOI: https://doi.org/10.1007/s11307-013-0655-6