Quantitative analyses of regional [11C]PE2I binding to the dopamine transporter in the human brain: a PET study

European Journal of Nuclear Medicine and Molecular Imaging
Aurelija JucaiteLars Farde

Abstract

The dopamine transporter (DAT) is a plasma membrane protein of central interest in the pathophysiology of neuropsychiatric disorders and is known to be a target for psychostimulant drugs. [(11)C]PE2I is a new radioligand which binds selectively and with moderate affinity to central DAT, as has been demonstrated in vitro by autoradiography and in vivo by positron emission tomography (PET). The aims of the present PET study were to quantify regional [(11)C]PE2I binding to DAT in the human brain and to compare quantitative methods with regard to suitability for applied clinical studies. One PET measurement was performed in each of eight healthy male subjects. The binding potential (BP) values were obtained by applying kinetic compartment analysis, which uses the metabolite-corrected arterial plasma curve as an input function. They were compared with the BP values quantified by two reference tissue approaches, using cerebellum as a reference region representing free and non-specific radioligand binding. The radioactivity concentration was highest in the striatum, lower in the midbrain and very low in the cerebellum. The regional [(11)C]PE2I binding could be interpreted by kinetic compartment models. However, the BP values in the st...Continue Reading

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