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In vivo evaluation of [11C]preladenant positron emission tomography for quantification of adenosine A2A receptors in the rat brain.


ABSTRACT: [11C]Preladenant was developed as a novel adenosine A2A receptor positron emission tomography radioligand. The present study aims to evaluate the suitability of [11C]preladenant positron emission tomography for the quantification of striatal A2A receptor density and the assessment of striatal A2A receptor occupancy by KW-6002. Sixty- or ninety-minute dynamic positron emission tomography imaging was performed on rats. Tracer kinetics was quantified by the two-tissue compartment model, Logan graphical analysis and several reference tissue-based models. Test-retest reproducibility was assessed by repeated imaging on two consecutive days. Two-tissue compartment model and Logan plot estimated comparable distribution volume ( VT) values of ?10 in the A2A receptor-rich striatum and substantially lower values in all extra-striatal regions (?1.5-2.5). The simplified reference tissue model with midbrain or occipital cortex as the reference region proved to be the best non-invasive model for quantification of A2A receptor, showing a striatal binding potential ( BPND) value of ?5.5, and a test-retest variability of ?5.5%. The brain metabolite analysis showed that at 60-min post injection, 17% of the radioactivity in the brain was due to radioactive metabolites. The ED50 of KW-6002 in rat striatum for i.p. injection was 0.044-0.062?mg/kg. The study demonstrates that [11C]preladenant is a suitable tracer to quantify striatal A2A receptor density and assess A2A receptor occupancy by A2A receptor-targeting molecules.

SUBMITTER: Zhou X 

PROVIDER: S-EPMC5381452 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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In vivo evaluation of [<sup>11</sup>C]preladenant positron emission tomography for quantification of adenosine A<sub>2A</sub> receptors in the rat brain.

Zhou Xiaoyun X   Khanapur Shivashankar S   de Jong Johan R JR   Willemsen Antoon Tm AT   Dierckx Rudi Ajo RA   Elsinga Philip H PH   de Vries Erik Fj EF  

Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism 20160720 2


[<sup>11</sup>C]Preladenant was developed as a novel adenosine A<sub>2A</sub> receptor positron emission tomography radioligand. The present study aims to evaluate the suitability of [<sup>11</sup>C]preladenant positron emission tomography for the quantification of striatal A<sub>2A</sub> receptor density and the assessment of striatal A<sub>2A</sub> receptor occupancy by KW-6002. Sixty- or ninety-minute dynamic positron emission tomography imaging was performed on rats. Tracer kinetics was quan  ...[more]

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