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  • Estrada, Sergio, et al. (författare)
  • [C-11]UCB-A, a novel PET tracer for synaptic vesicle protein 2 A
  • 2016
  • Ingår i: Nuclear Medicine and Biology. - : Elsevier BV. - 0969-8051 .- 1872-9614. ; 43:6, s. 325-332
  • Tidskriftsartikel (refereegranskat)abstract
    • Introduction: Development of a selective and specific high affinity PET tracer, [C-11]UCB-A, for the in vivo study of SV2A expression in humans. Radiochemistry and preclinical studies in rats and pigs including development of a tracer kinetic model to determine V-T. A method for the measurement of percent intact tracer in plasma was developed and the radiation dosimetry was determined in rats. Results: 3-5 GBq of [C-11]UCB-A could be produced with radiochemical purity exceeding 98% with a specific radioactivity of around 65 GBq/mu mol. In vitro binding showed high selective binding towards SV2A. [C-11]UCB-A displayed a dose-dependent and reversible binding to SV2A as measured with PET in rats and pigs and the V-T could be determined by Logan analysis. The dosimetry was favorable and low enough to allow multiple administrations of [C-11]UCB-A to healthy volunteers, and the metabolite analysis showed no sign of labeled metabolites in brain. Conclusions: We have developed the novel PET tracer, [C-11]UCB-A, that can be used to measure SV2A expression in vivo. The dosimetry allows up to 5 administrations of 400 MBq of [C-11]UCB-A in humans. Apart from measuring drug occupancy, as we have shown, the tracer can potentially be used to compare SV2A expression between individuals because of the rather narrow range of baseline V-T values. This will have to be further validated in human studies.
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