Journal article Closed Access
Janssen, Bieneke; Vugts, Danielle J; Funke, Uta; Spaans, Arnold; Schuit, Robert C; Kooijman, Esther; Rongen, Marissa; Perk, Lars R; Lammertsma, Adriaan A; Windhorst, Albert D
Neuroinflammation, in particular activation of microglia, is thought to play an important role in the progression of
neurodegenerative diseases. In activated microglia, the purinergic P2X7 receptor is upregulated. A-740003, a highly affine
and selective P2X7 receptor antagonist, is a promising candidate for the development of a radiotracer for imaging of
neuroinflammation by positron emission tomography. For this purpose, [11C]A-740003 was synthesised and evaluated
in vivo with respect to both tracer metabolism and biodistribution. In plasma, a moderate metabolic rate was seen. In healthy rat brain, only marginal uptake of [11C]A-740003 was observed and, therefore, metabolites in brain could not be determined. Whether the minimal brain uptake is due to the low expression levels of the P2X7 receptor in healthy brain or to limited transport across the blood–brain barrier has yet to be elucidated.
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