Increase in thalamic binding of [11C]PE2I in patients with schizophrenia: A positron emission tomography study of dopamine transporter

Ryosuke Arakawa, Tetsuya Ichimiya, Hiroshi Ito, Akihiro Takano, Masaki Okumura, Hidehiko Takahashi, Harumasa Takano, Fumihiko Yasuno, Motoichiro Kato, Yoshiro Okubo, Tetsuya Suhara

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Previous in vivo imaging studies reported no difference in dopamine transporter (DAT) bindings in the striatum between control subjects and patients with schizophrenia. However, as the signals of radioligands with moderate affinity were insufficient for allowing the evaluation of small amounts of DAT, DAT binding in extrastriatal regions has not been determined. Positron emission tomography scanning using [11C]PE2I was performed on eight patients with schizophrenia and twelve normal control subjects. Binding potential (BPND) for DAT in the caudate, putamen, thalamus and substantia nigra was calculated, using the cerebellum as reference region. In patients with schizophrenia, clinical symptoms were evaluated by Positive and Negative Syndrome Scale (PANSS). BPND in the thalamus of patients with schizophrenia was significantly higher than in control subjects (P = 0.044). In patients with schizophrenia, there were significantly positive correlations between BPND in the thalamus and total (r = 0.75), positive (r = 0.78) and negative PANSS scores (r = 0.82). Altered DAT in the thalamus might be related to the pathophysiology and clinical symptoms of schizophrenia.

Original languageEnglish
Pages (from-to)1219-1223
Number of pages5
JournalJournal of Psychiatric Research
Issue number15
Publication statusPublished - 2009 Oct
Externally publishedYes


  • Dopamine transporter
  • Positron emission tomography
  • Schizophrenia
  • Thalamus
  • [C]PE2I

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry


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