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Preclinical evaluation of [11C]SA4503: radiation dosimetry,in vivo selectivity and PET imaging of sigma1 receptors in the cat brain

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Abstract

Our previousin vivo study with rats has demonstrated that11C-labeled 1-(3,4-dimethoxyphenethyl)-4-(3-phenylpropyl)piperazine ([11C]SA4503) is a potential radioligand for mapping CNS sigma1 receptors by positron emission tomography (PET). In the present study, we further characterized this ligand. The radiation absorbed-dose of [11C]SA4503 in humans estimated with the tissue distribution in mice, was higher in the liver, kidney and pancreas than in other organs studied, but was low enough for clinical use. The brain uptake of [11C]SA4503 in mice was reduced to approximately 60–70% by co-injection of carrier SA4503 and haloperidol, but not by co-injection of any of six ligands for sigma2 or other receptors, for which SA4503 showedin vitro >100 times weaker affinity than for sigma1 receptor. In the cat brain, the uptake in the cortex was higher than that in the cerebellum. The radioactivity in the cortex and cerebellum accumulated for the first 10 min and then gradually decreased until 81.5 min in the baseline measurement, but rapidly decreased in the carrier-loading condition. The receptor-mediated uptake was estimated to be approximately 60–65% of the total radioactivity in the cortex and cerebellum at 76 min after tracer injection. We have concluded that [11C]SA4503 has the potential for mapping sigma1 receptor by PET.

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Authors and Affiliations

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

    Kazunori Kawamura, Kiichi Ishiwata, Yuhei Shimada, Yuichi Kimura & Michio Senda

  2. Kyoritsu College of Pharmacy, Tokyo, Japan

    Kazunori Kawamura & Yoshio Homma

  3. Central Research Laboratories, Santen Pharmaceutical Co., Ltd., Osaka, Japan

    Tadayuki Kobayashi & Kiyoshi Matsuno

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  1. Kazunori Kawamura
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  2. Kiichi Ishiwata
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Correspondence to Kazunori Kawamura.

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Kawamura, K., Ishiwata, K., Shimada, Y. et al. Preclinical evaluation of [11C]SA4503: radiation dosimetry,in vivo selectivity and PET imaging of sigma1 receptors in the cat brain. Ann Nucl Med 14, 285–292 (2000). https://doi.org/10.1007/BF02988211

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  • DOI: https://doi.org/10.1007/BF02988211

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