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[3H]S33084: a novel, selective and potent radioligand at cloned, human dopamine D3 receptors.

Cussac D, Newman-Tancredi A, Sezgin L, Millan MJ.
Naunyn Schmiedebergs Arch Pharmacol. 2000 May;361(5):569-72.

The novel, selective dopamine D3 receptor antagonist, S33084 [(3aR,9bS)-N[4-(8-cyano- 1,3a,4,9b-tetrahydro-3H-benzopyrano[3,4-c]pyrrole-2-yl)-butyl] (4-phenyl)benzamide], was tritium-labelled to 59 Ci/mmol specific activity. Determination of association and dissociation rate constants at recombinant, human (h) D3 receptors stably expressed in Chinese hamster ovary (CHO) cells yielded a Kd value (0.16 nM) comparable to that observed in saturation binding experiments (0.17 nM). The competition binding profile of [3H]S33084 with diverse D3 receptor agonists and antagonists correlated highly (0.99) with that of [3H]spiperone. In conclusion, [3H]S33084 is a highly potent and selective radioligand at dopamine D3 receptors, which should be of considerable use for their characterisation.