title: 3-N-(2-[18F]-fluoroethyl)-spiperone: a novel ligand for cerebral dopamine receptor studies with pet.
abstract: 3-N-(2-[18F]-fluoroethyl)-spiperone [( 18F]-FESP) was synthesized at high specific activity by condensation with 2-[18F]-fluoroethyltosylate (35 TBq/mmol). In vivo binding studies in baboons by positron emission tomography exhibited regio-selective uptake in the striatum which was saturable with the cold ligand and prevented by pretreatment with (+)-butaclamol. The pharmacokinetic behaviour, i.e. the absolute uptake in tissue and the striatum-to-cerebellum ratio, was very similar to that of methylspiperone. Analysis of the radioactivity in mouse brain after administration of [18F]-FESP indicated a high in-vivo stability (greater than 90% after 210 min in the striatum). Comparative distribution studies of other N-fluoroalkylspiperones in mice suggest that FESP and the N-fluoropropyl analogue are the most potent D2 receptor ligands.
mesh_terms: D000818:Animals; D002531:Cerebellum / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism*; D005461:Fluorine; D008297:Male; D051379:Mice; D010215:Papio; D011868:Radioisotopes; D011869:Radioligand Assay; D011954:Receptors, Dopamine / Q000378:metabolism*; D017448:Receptors, Dopamine D2; D013134:Spiperone / Q000031:analogs & derivatives*; D014055:Tomography, Emission-Computed / Q000379:methods*
chemical_list: D011868:Radioisotopes; D011954:Receptors, Dopamine; D017448:Receptors, Dopamine D2; C051175:3-N-(2-fluoroethyl)spiperone; D005461:Fluorine; D013134:Spiperone