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Zolmitriptan is a serotonin 5-HT 1B/1D  receptor agonist that is an effective and well-tolerated drug for migraine treatment. In a human positron emission tomography study, [ 11 C]zolmitriptan crossed the blood-brain barrier but no clear pattern of regional uptake was discernable. The objective of this study was to map the binding of [ 11 C]zolmitriptan in Rhesus monkey brain using whole hemisphere  in vitro  autoradiography with [ 11 C]zolmitriptan as a radioligand. In saturation studies, [ 11 C]zolmitriptan showed specific (90%) binding to a population of high-affinity binding sites (Kd 0.95–5.06 nM). There was regional distribution of binding sites with the highest density in the ventral pallidum, followed by the external globus pallidus, substantia nigra, visual cortex, and nucleus accumbens. In competitive binding studies with 5-HT 1  receptor antagonists, [ 11 C]zolmitriptan binding was blocked by selective 5-HT 1B  and 5-HT 1D  ligands in all target areas. There was no appreciable change in binding with the addition of a 5-HT 1A  receptor antagonist.

international journal of molecular imaging

Autoradiographic Mapping of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn mathvariant="bold-italic">5</mml:mn><mml:mtext mathvariant="bold">-</mml:mtext><mml:msub><mml:mrow><mml:mi mathvariant="bold">H</mml:mi><mml:mi mathvariant="bold">T</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant="bold">1</mml:mn><mml:mi mathvariant="bold">B</mml:mi><mml:mo>/</mml:mo><mml:mn mathvariant="bold">1</mml:mn><mml:mi mathvariant="bold">D</mml:mi></mml:mrow></mml:msub></mml:math>Binding Sites …

Autoradiographic Mapping of5-HT1B/1DBinding Sites …