Annals of Nuclear Medicine

, Volume 13, Issue 3, pp 161–167

Comparison of three PET dopamine D2-like receptor ligands, [11C]raclopride, [11C]nemonapride and [11C]N-methylspiperone, in rats

  • Kiichi Ishiwata
  • Nobutaka Hayakawa
  • Nobuo Ogi
  • Keiichi Oda
  • Hinako Toyama
  • Kazutoyo Endo
  • Akira Tanaka
  • Michio Senda
Original Article


We studied the tracer kinetics of three dopamine D2-like receptor ligands, [11C]raclopride ([11C]RAC), [11C]nemonapride ([11C]NEM) and [11C]N-methylspiperone ([11C]MSP), in anesthetized rats by tissue dissection,ex vivo ARG and PET in order to clarify their characteristics for PET imaging. Thein vivo affinity of the three ligands for the striatum ([11C]MSP > [11C]NEM > [11C]RAC) obeyed thein vitro affinity for dopamine D2 receptors. The affinity of [11C]RAC and [11C]MSP for the cerebellum was very low, but the affinity of [11C]NEM for the cerebellum was compatible to that for the cortex and was not to be ignored. Also the affinity of [11C]MSP for the cortex was relatively high. [11C]RAC showed the highest selectivity. The striatal PET image with [11C]RAC was clearer than that with [11C]NEM or [11C]MSP, but the activity decreased much faster than that measured by tissue dissection because of the partial volume effect. The striatal activity with [11C]NEM remained high and that with [11C]MSP gradually increased. [11C]RAC and [11C]MSP, but not [11C]NEM, showed a high accumulation in the periorbital region.

Key words

raclopride nemonapride N-methylspiperone dopamine D2-like receptor rat PET 


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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • Kiichi Ishiwata
    • 1
  • Nobutaka Hayakawa
    • 1
    • 2
  • Nobuo Ogi
    • 1
    • 2
  • Keiichi Oda
    • 1
  • Hinako Toyama
    • 1
  • Kazutoyo Endo
    • 2
  • Akira Tanaka
    • 2
  • Michio Senda
    • 1
  1. 1.Positron Medical CenterTokyo Metropolitan Institute of GerontologyTokyoJapan
  2. 2.Showa College of Pharmaceutical SciencesJapan

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