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Journal Article
Research Support, Non-U.S. Gov't
Radiosynthesis and biological evaluation of N-[18F]labeled glutamic acid as a tumor metabolic imaging tracer.
PloS One 2014
We have previously reported that N-(2-[18F]fluoropropionyl)-L-methionine ([18F]FPMET) selectively accumulates in tumors. However, due to the poor pharmacokinetics of [18F]FPMET in vivo, the potential clinical translation of this observation is hampered. In this study, we rationally designed and synthesized [18F] or [11C]labeled N-position L-glutamic acid analogues for tumor imaging. N-(2-[18F]fluoropropionyl)-L-glutamic acid ([18F]FPGLU) was synthesized with a 30±10% (n = 10, decay-corrected) overall radiochemical yield and a specific activity of 40±25 GBq/μmol (n = 10) after 130 min of radiosynthesis. In vitro cell experiments showed that [18F]FPGLU was primarily transported through the XAG(-) system and was not incorporated into protein. [18F]FPGLU was stable in urine, tumor tissues, and blood. We were able to use [18F]FPGLU in PET imaging and obtained high tumor to background ratios when visualizing tumors tissues in animal models.
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