title: Acute administration of haloperidol does not influence 123I-FP-CIT binding to the dopamine transporter.
abstract: A recent (123)I-FP-CIT ((123)-I-N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl)nortropane) SPECT study on rats suggested that a single 1 mg/kg dose of the antipsychotic haloperidol induces enough dopamine release to compete with (123)I-FP-CIT for binding to the dopamine transporter. Taking into account the far-reaching consequences of this proposition, we were interested in testing whether we could reproduce this finding using storage phosphor imaging.
  
  
  METHODS
  Twenty rats were pretreated with saline or haloperidol (1 mg/kg of body weight) and then injected with (123)I-FP-CIT. Two hours after (123)I-FP-CIT injection, the rats were sacrificed and binding in the striatum, nucleus accumbens, and cerebellum (nonspecific binding) was measured.
  
  
  RESULTS
  In contrast to the earlier SPECT finding, acute administration of haloperidol did not induce a significant change in (123)I-FP-CIT binding ratios in the striatum and nucleus accumbens.
  
  
  CONCLUSIONS
  Changes in synaptic dopamine due to acute haloperidol administration were not detectable with (123)I-FP-CIT.
authors.affiliation: Department of Nuclear Medicine, University of Amsterdam, Academic Medical Center, Amsterdam, The Netherlands; and.
authors.forename: Jan
authors.initials: J
authors.lastname: Booij
authors.forename: Guus
authors.initials: G
authors.lastname: van Loon
authors.forename: Kora
authors.initials: K
authors.lastname: de Bruin
authors.forename: Pieter
authors.initials: P
authors.lastname: Voorn
mesh_terms: D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology*; D001921:Brain / Q000000981:diagnostic imaging / Q000378:metabolism; D002531:Cerebellum / Q000000981:diagnostic imaging / Q000378:metabolism; D050483:Dopamine Plasma Membrane Transport Proteins / Q000378:metabolism*; D006220:Haloperidol / Q000494:pharmacology*; D008297:Male; D017072:Neostriatum / Q000000981:diagnostic imaging / Q000378:metabolism; D009714:Nucleus Accumbens / Q000000981:diagnostic imaging / Q000378:metabolism; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D015899:Tomography, Emission-Computed, Single-Photon; D014326:Tropanes / Q000493:pharmacokinetics*
chemical_list: D014150:Antipsychotic Agents; D050483:Dopamine Plasma Membrane Transport Proteins; D019275:Radiopharmaceuticals; D014326:Tropanes; C087552:2-carbomethoxy-8-(3-fluoropropyl)-3-(4-iodophenyl)tropane; D006220:Haloperidol
keywords: antipsychotics; dopamine release; dopamine transporter; haloperidol; rats