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68 Ga-Labelled Tropane Analogues for the Visualization of the Dopaminergic System.


ABSTRACT: The development of radiometal-labelled pharmaceuticals for neuroimaging could offer great potential due to easier handling during labelling and availability through radionuclide generator systems. Nonetheless, to date, no such tracers are available for positron emission tomography, primarily owing to the challenge of crossing the blood-brain barrier (BBB) and loss of affinity through chelator attachment. We have prepared a variety of 68 Ga-labelled phenyltropanes showing that, through a simple hydrocarbon-linker, it is possible to introduce a chelator onto the lead structure while maintaining its high affinity for hDAT (human dopamine transporter) and simultaneously achieving adequate lipophilicity. One of the candidates, [68 Ga]Ga-HBED-hexadiyne-tropane, showed an IC50 value of 66 nM, together with a log D7.4 of 0.96. A μPET study in a hemi-parkinsonian rat model showed a fast wash-out of the tracer, and no specific uptake in the brain, thus implying an inability to penetrate the BBB.

SUBMITTER: Haseli S 

PROVIDER: S-EPMC7984292 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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<sup>68</sup> Ga-Labelled Tropane Analogues for the Visualization of the Dopaminergic System.

Häseli Sascha S   Holy Marion M   Joksch Markus M   Bergner Carina C   Wree Andreas A   Kurth Jens J   Cankaya Aylin A   Piel Markus M   Krause Bernd J BJ   Sitte Harald H HH   Rösch Frank F  

ChemMedChem 20201210 5


The development of radiometal-labelled pharmaceuticals for neuroimaging could offer great potential due to easier handling during labelling and availability through radionuclide generator systems. Nonetheless, to date, no such tracers are available for positron emission tomography, primarily owing to the challenge of crossing the blood-brain barrier (BBB) and loss of affinity through chelator attachment. We have prepared a variety of <sup>68</sup> Ga-labelled phenyltropanes showing that, through  ...[more]

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