[18F]CFT synthesis and binding to monoamine transporters in rats View Full Text


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Article Info

DATE

2012-12

AUTHORS

Sarita Forsback, Päivi Marjamäki, Olli Eskola, Jörgen Bergman, Johanna Rokka, Tove Grönroos, Merja Haaparanta, Olof Solin

ABSTRACT

BACKGROUND: We present the electrophilic synthesis of [18F]2β-carbomethoxy-3β-(4-fluoro)tropane [[18F]CFT] and the pharmacological specificity and selectivity of [18F]CFT for monoamine transporters in the brain and peripheral organs of rats. The human radiation dose is extrapolated from the animal data. METHODS: [18F]CFT was synthesized by electrophilic fluorination of a stannylated precursor by using post-target-produced [18F]F2 as a fluorinating agent. The ex vivo 18F-activity biodistribution of [18F]CFT in the brain of rats was studied by autoradiography. The binding of [18F]CFT to the monoamine transporters was studied using in vivo blocking experiments with dopamine transporter [DAT], norepinephrine transporter [NET], or serotonin transporter [SERT] inhibitors. In vivo animal positron emission tomography was used as a comparative method to determine tracer kinetics. Human radiation dose was assessed using OLINDA software. RESULTS: The radiochemical yield of [18F]CFT from the initial [18F]F-, decay corrected to the end of bombardment, was 3.2 ± 1.0%. The specific activity [SA] was 14.5 ± 3.4 GBq/μmol, decay corrected to the end of synthesis. Radiochemical purity exceeded 99%. DAT-specific binding was found in the striatum, locus coeruleus, and pancreas. NET-specific binding was found in the locus coeruleus. SERT-specific binding was not found in any of the studied organs. Effective dose equivalent [EDE] estimated for the standard human model was 12.8 μSv/MBq. Effective dose [ED] was 9.17 μSv/MBq. CONCLUSIONS: Post-target-produced high-SA [18F]F2 was used to incorporate18F directly into the phenyl ring of [18F]CFT. The final product had high radiochemical and chemical purities and a high SA for DAT and NET studies in vivo. In periphery, [18F]CFT showed a specific uptake in the pancreas. EDE and ED corresponded well with other18F-radioligands. More... »

PAGES

3

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/2191-219x-2-3

DOI

http://dx.doi.org/10.1186/2191-219x-2-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1031255770

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22277306


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