Radiosynthesis and evaluation of N-(3-[18F]fluoropropyl)paroxetine as a radiotracer for in vivo labeling of serotonin uptake sites by PET

Makiko Suehiro, Alan A. Wilson, Ursula Scheffel, Robert F. Dannals, Hayden T. Ravert, Henry N. Wagner

Research output: Contribution to journalArticlepeer-review


To visualize serotonin uptake sites by positron emission tomography (PET), N-(3-[18F]fluoropropyl)-paroxetine ([18F]FPP) (Fig. 1), a derivative of the selective serotonin uptake blocker paroxetine, was synthesized from 3-[18F]fluoropropyltosylate and paroxetine via a one-pot procedure. The rate of formation of [18F]FPP was a function of the ratio of the initial amount of paroxetine to that of 1,3-propanediol bistosylate with which [18F]fluoropropyltosylate was synthesized. When the reaction mixture contained an excess amount of paroxetine over that of the propyl-bistosylate, the radiosynthesis followed by HPLC purification, which took approx. 90 min, gave [18F]FPP in a radiochemical yield of approx. 8%, and in high radiochemical and chemical purity. The specific activity was 2640 ± 360 mCi/μmol. The brain biodistribution of [18F]FPP showed no distinguishable localization in regions with high density of serotonin uptake sites such as hypothalamus or olfactory tubercles. In vitro binding assays revealed that N-fluoropropylation of paroxetine reduced the affinity for the serotonin uptake site by three orders of magnitude.

Original languageEnglish (US)
Pages (from-to)791-796
Number of pages6
JournalInternational Journal of Radiation Applications and Instrumentation.
Issue number7
StatePublished - 1991

ASJC Scopus subject areas

  • Medicine(all)


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