Add time:08/16/2019         Source:sciencedirect.com

[18F]-N-(p-nitrobenzyl)spiperone, [18F]PNBS, was prepared and its in vivo uptake in rat brain was measured. A temporal increase in striatum:cerebellum ratio and frontal cortex:cerebellum (FC:Cb) ratio was observed. Blocking studies suggested the formation of a radiolabeled metabolite, presumably [18F]spiperone, that is capable of crossing the blood-brain barrier and labeling cortical 5-HT2 receptors. This was confirmed using the ISRP method of metabolite analysis indicating [18F]PNBS is not a suitable tracer for studying D2 receptors in vivo with PET.

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