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Successive positron emission tomography measurement of cerebral blood flow and neuroreceptors in the human brain: an 11C-SA4503 study

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Abstract

For evaluating a newly developed radioligand for positron emission tomography (PET), successive measurements of regional cerebral blood flow (rCBF) and the kinetics of the radioligand in the same subject are preferable in the first clinical trial. In this study, we demonstrate an example for the study of 11C-labeled 1-(3,4-dimethoxyphenethyl)-4-(3-phenylprophyl) piperazine (11C-SA4503) for mapping sigma1 receptors in the human brain. Five healthy male subjects underwent two successive PET scans with 15O-H2O to measure the rCBF and with 11C-SA4503 (dynamic 60-min scan). The brain kinetics of 11C-SA4503 was evaluated using the time-activity curve (TAC) of tissue in each of the 11 regions of the brain and the metabolite-corrected TAC of plasma on the basis of a two-tissue compartment fourparameter model. The estimated parameters were four rate constants: K 1, influx from plasma to brain tissue; k 2, efflux from tissue to plasma; k 3, association between tracer and receptors; and k 4, dissociation of tracer-receptor complex, and the binding potential (BP), k 3/k 4. 11CSA4503 was distributed all over the brain, and the TACs exhibited an accumulation pattern in all the 11 regions. K 1 of 11C-SA4503 correlated with rCBF, but the other three rate constant parameters and BP did not. The regional difference in the BP of 11C-SA4503 is compatible with those of sigma1 receptors. In conclusion, successive PET measurements of rCBF and the brain kinetics of radioligand-neuroreceptor binding are useful for the first clinical trial of a newly developed radioligand for mapping neuroreceptors, and the protocol is applicable to pathophysiological studies of brain disorders.

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Authors and Affiliations

  1. Positron Medical Center, Tokyo Metropolitan Institute of Gerontology, 1-1 Naka-cho, Itabashi-ku, Tokyo, 173-0022, Japan

    Kiichi Ishiwata, Kenji Ishii, Yuichi Kimura, Kazunori Kawamura, Keiichi Oda, Toru Sasaki, Muneyuki Sakata & Michio Senda

  2. Institute of Biomedical Research and Innovation, Kobe, Japan

    Michio Senda

Authors
  1. Kiichi Ishiwata
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  2. Kenji Ishii
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  3. Yuichi Kimura
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  4. Kazunori Kawamura
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  5. Keiichi Oda
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  6. Toru Sasaki
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  7. Muneyuki Sakata
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  8. Michio Senda
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Corresponding author

Correspondence to Kiichi Ishiwata.

Additional information

A part of this study was presented at the Seventh Annual Meeting of the Organization for Human Brain Mapping at Brighton, UK June 10–14, 2001 [NeuroImage 2001;13(Number 6, Part 2 of 2 Parts) S984].

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Ishiwata, K., Ishii, K., Kimura, Y. et al. Successive positron emission tomography measurement of cerebral blood flow and neuroreceptors in the human brain: an 11C-SA4503 study. Ann Nucl Med 22, 411–416 (2008). https://doi.org/10.1007/s12149-008-0133-4

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  • DOI: https://doi.org/10.1007/s12149-008-0133-4

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