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Fukumura T, Mori W, Ogawa M, Fujinaga M, Zhang MR. [ 11C]phosgene: Synthesis and application for development of PET radiotracers. Nucl Med Biol 2020; 92:138-148. [PMID: 32546396 DOI: 10.1016/j.nucmedbio.2020.04.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 04/29/2020] [Indexed: 11/26/2022]
Abstract
Carbon-11-labeled phosgene ([11C]phosgene, [11C]COCl2) is a useful labeling agent that connects two heteroatoms by inserting [11C]carbonyl (11C=O) function in carbamates, ureas, and carbonates, which are components of biologically important heterocyclic compounds and functional groups in drugs as a linker of fragments with in vivo stability. Development of 11C-labeled PET tracers has been performed using [11C]phosgene as a labeling agent. However, [11C]phosgene has not been frequently used for 11C-labeling because preparation of [11C]phosgene required dedicated synthesis apparatus (not commercially available) and had problems in reproducibility and reliability. In our laboratory, an improved method for synthesizing [11C]phosgene using a carbon tetrachloride detection tube kit in environmental air analysis and the automated synthesis system for preparing [11C]phosgene have been developed in 2009. This apparatus has been used for routine synthesis of 11C-labeled tracers 1-4 times/week. Using [11C]phosgene we have developed and produced many PET radiotracers containing [11C]urea and [11C]carbamate moieties. In this review, we report the performance of our method for preparing [11C]phosgene, including automated synthesis apparatus developed in house, and the application of [11C]phosgene for development and production of 11C-labeled PET tracers.
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Affiliation(s)
- Toshimitsu Fukumura
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Wakana Mori
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Masanao Ogawa
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; SHI Accelerator Service, Ltd., Tokyo 141-8686, Japan
| | - Masayuki Fujinaga
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Ming-Rong Zhang
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
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Stellhorn JR, Hosokawa S, Happo N, Tajiri H, Matsushita T, Kaminaga K, Fukumura T, Hasegawa T, Hayashi K. A valence-selective X-ray fluorescence holography study of an yttrium oxide thin film. J Appl Crystallogr 2017. [DOI: 10.1107/s1600576717012821] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The first direct valence-selective structure determination by X-ray fluorescence holography is reported. The method is applied to investigate an epitaxial thin film of the rare earth monoxide YO, which has recently been synthesized by pulsed laser deposition. The surface of the sample is easily oxidized to Y2O3. In order to separate the structural information connected with the two different valence states of Y, the X-ray fluorescence holography measurements were performed close to the YKabsorption edge. Using the shift of the absorption edge for the different valence states, very different relative contributions of YO and Y2O3are obtained. Thus, it is possible to distinguish the crystal structures of YO and Y2O3in the thin-film sample.
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Kawahara K, Chikamatsu A, Katayama T, Onozuka T, Ogawa D, Morikawa K, Ikenaga E, Hirose Y, Harayama I, Sekiba D, Fukumura T, Hasegawa T. Topotactic fluorination of perovskite strontium ruthenate thin films using polyvinylidene fluoride. CrystEngComm 2017. [DOI: 10.1039/c6ce02358d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ohya T, Nagatsu K, Suzuki H, Fukada M, Minegishi K, Hanyu M, Fukumura T, Zhang MR. Efficient preparation of high-quality 64 Cu for routine use. Nucl Med Biol 2016; 43:685-691. [DOI: 10.1016/j.nucmedbio.2016.07.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 07/27/2016] [Indexed: 11/16/2022]
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5
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Hanyu M, Kawamura K, Takei M, Furutsuka K, Shiomi S, Fujishiro T, Ogawa M, Nengaki N, Hashimoto H, Fukumura T, Zhang MR. Radiosynthesis and quality control of [ 11 C]TASP457 as a clinically useful PET ligand for imaging of histamine H 3 receptors in human brain. Nucl Med Biol 2016; 43:679-684. [DOI: 10.1016/j.nucmedbio.2016.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 07/12/2016] [Accepted: 08/06/2016] [Indexed: 10/21/2022]
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6
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Kikuchi T, Okamura T, Okada M, Ogawa M, Suzuki C, Wakizaka H, Yui J, Fukumura T, Gee AD, Zhang MR. Benzyl [11C]Hippurate as an Agent for Measuring the Activities of Organic Anion Transporter 3 in the Brain and Multidrug Resistance-Associated Protein 4 in the Heart of Mice. J Med Chem 2016; 59:5847-56. [DOI: 10.1021/acs.jmedchem.6b00454] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsuya Kikuchi
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
- Division
of Imaging Sciences and Biomedical Engineering, King’s College London, Fourth Floor Lambeth Wing, St. Thomas’ Hospital, Lambeth Palace
Road, London SE1 7EH, United Kingdom
| | - Toshimitsu Okamura
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
| | - Maki Okada
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
| | - Masanao Ogawa
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
- SHI Accelerater Service Co. Ltd., 5-9-1 Kitashinagawa, Shinagawa-ku, Tokyo 141-8686, Japan
| | - Chie Suzuki
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
- Preeminent
Medical Photonics Education Research Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Hidekatsu Wakizaka
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
| | - Joji Yui
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
| | - Toshimitsu Fukumura
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
| | - Antony D. Gee
- Division
of Imaging Sciences and Biomedical Engineering, King’s College London, Fourth Floor Lambeth Wing, St. Thomas’ Hospital, Lambeth Palace
Road, London SE1 7EH, United Kingdom
| | - Ming-Rong Zhang
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa,
Inage-ku, Chiba 263-8555, Japan
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7
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Koga K, Maeda J, Tokunaga M, Hanyu M, Kawamura K, Ohmichi M, Nakamura T, Nagai Y, Seki C, Kimura Y, Minamimoto T, Zhang MR, Fukumura T, Suhara T, Higuchi M. Development of TASP0410457 (TASP457), a novel dihydroquinolinone derivative as a PET radioligand for central histamine H3 receptors. EJNMMI Res 2016; 6:11. [PMID: 26860293 PMCID: PMC4747952 DOI: 10.1186/s13550-016-0170-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/30/2016] [Indexed: 11/14/2022] Open
Abstract
Background Histamine H3 receptor (H3R) is a potential therapeutic target of sleep- and cognition-related disorders. The purpose of the present study is to develop a novel positron emission tomography (PET) ligand for H3Rs from dihydroquinolinone derivatives, which we previously found to have high affinity with these receptors. Methods Six compounds were selected from a dihydroquinolinone compound library based on structural capability for 11C labeling and binding affinity for H3Rs. Their in vivo kinetics in the rat brain were examined in a comparative manner by liquid chromatography and tandem mass spectrometry (LC-MS/MS). Chemicals with appropriate kinetic properties were then labeled with 11C and evaluated in rats and monkeys using PET. Results Of the six compounds, TASP0410457 (also diminutively called TASP457) and TASP0434988 exhibited fast kinetics and relatively high brain uptakes in ex vivo LC-MS/MS and were selected as candidate PET imaging agents. PET data in rat brains were mostly consistent with LC-MS/MS findings, and rat and monkey PET scans demonstrated that [11C]TASP0410457 was superior to [11C]TASP0434988 for high-contrast H3R PET imaging. In the monkey brain PET, distribution volume for [11C]TASP0410457 could be quantified, and receptor occupancy by a nonradioactive compound was measurable using this radioligand. The specific binding of [11C]TASP0410457 to H3Rs was confirmed by autoradiography using rat and monkey brain sections. Conclusions We developed [11C]TASP0410457 as a radioligand enabling a robust quantification of H3Rs in all brain regions and demonstrated the utility of ex vivo LC-MS/MS and in vivo PET assays for selecting appropriate imaging tracers. [11C]TASP0410457 will help to examine the implication of H3Rs in neuropsychiatric disorders and to characterize emerging therapeutic agents targeting H3Rs. Electronic supplementary material The online version of this article (doi:10.1186/s13550-016-0170-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kazumi Koga
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan.,Taisho Pharmaceutical Co., Ltd., 1-403 Yoshino-cho, Kita-ku, Saitama, 331-9530, Japan.,Tohoku University Graduate School of Medicine, 2-1 Seiryo-cho, Aoba-ku, Sendai, 980-8575, Japan
| | - Jun Maeda
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Masaki Tokunaga
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Masayuki Hanyu
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Kazunori Kawamura
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Mari Ohmichi
- Taisho Pharmaceutical Co., Ltd., 1-403 Yoshino-cho, Kita-ku, Saitama, 331-9530, Japan
| | - Toshio Nakamura
- Taisho Pharmaceutical Co., Ltd., 1-403 Yoshino-cho, Kita-ku, Saitama, 331-9530, Japan
| | - Yuji Nagai
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Chie Seki
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Yasuyuki Kimura
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Takafumi Minamimoto
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Ming-Rong Zhang
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Toshimitsu Fukumura
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Tetsuya Suhara
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan
| | - Makoto Higuchi
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Chiba, 263-8555, Japan.
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8
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Onozuka T, Chikamatsu A, Katayama T, Fukumura T, Hasegawa T. Formation of defect-fluorite structured NdNiOxHy epitaxial thin films via a soft chemical route from NdNiO3 precursors. Dalton Trans 2016; 45:12114-8. [DOI: 10.1039/c6dt01737a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new phase of oxyhydride NdNiOxHy with a defect-fluorite structure was obtained by a soft chemical reaction of NdNiO3 epitaxial thin films on a substrate of SrTiO3 (100) with CaH2.
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Affiliation(s)
- T. Onozuka
- Department of Chemistry
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - A. Chikamatsu
- Department of Chemistry
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - T. Katayama
- Department of Chemistry
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - T. Fukumura
- Department of Chemistry
- Tohoku University
- Sendai
- Japan
| | - T. Hasegawa
- Department of Chemistry
- The University of Tokyo
- Tokyo 113-0033
- Japan
- Kanagawa Academy of Science and Technology (KAST)
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9
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Oka M, Kamisaka H, Fukumura T, Hasegawa T. DFT-based ab initio MD simulation of the ionic conduction in doped ZrO2 systems under epitaxial strain. Phys Chem Chem Phys 2015; 17:29057-63. [DOI: 10.1039/c5cp03238e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Valence distribution and trajectory of oxygen ions in calculated stable structures, which imply oxygen sublattice formation induced by strain and further deformation by oxygen vacancies.
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Affiliation(s)
- M. Oka
- Department of Chemistry
- School of Science
- The University of Tokyo
- 7-3-1 Hongo
- Bunkyo-ku
| | - H. Kamisaka
- Department of Chemistry
- School of Science
- The University of Tokyo
- 7-3-1 Hongo
- Bunkyo-ku
| | - T. Fukumura
- Department of Chemistry
- School of Science
- The University of Tokyo
- 7-3-1 Hongo
- Bunkyo-ku
| | - T. Hasegawa
- Department of Chemistry
- School of Science
- The University of Tokyo
- 7-3-1 Hongo
- Bunkyo-ku
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10
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Ito H, Shinotoh H, Shimada H, Miyoshi M, Yanai K, Okamura N, Takano H, Takahashi H, Arakawa R, Kodaka F, Ono M, Eguchi Y, Higuchi M, Fukumura T, Suhara T. Imaging of amyloid deposition in human brain using positron emission tomography and [18F]FACT: comparison with [11C]PIB. Eur J Nucl Med Mol Imaging 2014; 41:745-54. [PMID: 24233004 DOI: 10.1007/s00259-013-2620-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 10/18/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE The characteristic neuropathological changes in Alzheimer's disease (AD) are deposition of amyloid senile plaques and neurofibrillary tangles. The (18)F-labeled amyloid tracer, [(18)F]2-[(2-{(E)-2-[2-(dimethylamino)-1,3-thiazol-5-yl]vinyl}-1,3-benzoxazol-6-yl)oxy]-3-fluoropropan-1-ol (FACT), one of the benzoxazole derivatives, was recently developed. In the present study, deposition of amyloid senile plaques was measured by positron emission tomography (PET) with both [(11)C]Pittsburgh compound B (PIB) and [(18)F]FACT in the same subjects, and the regional uptakes of both radiotracers were directly compared. METHODS Two PET scans, one of each with [(11)C]PIB and [(18)F]FACT, were performed sequentially on six normal control subjects, two mild cognitive impairment (MCI) patients, and six AD patients. The standardized uptake value ratio of brain regions to the cerebellum was calculated with partial volume correction using magnetic resonance (MR) images to remove the effects of white matter accumulation. RESULTS No significant differences in the cerebral cortical uptake were observed between normal control subjects and AD patients in [(18)F]FACT studies without partial volume correction, while significant differences were observed in [(11)C]PIB. After partial volume correction, the cerebral cortical uptake was significantly larger in AD patients than in normal control subjects for [(18)F]FACT studies as well as [(11)C]PIB. Relatively lower uptakes of [(11)C]PIB in distribution were observed in the medial side of the temporal cortex and in the occipital cortex as compared with [(18)F]FACT. Relatively higher uptake of [(11)C]PIB in distribution was observed in the frontal and parietal cortices. CONCLUSION Since [(18)F]FACT might bind more preferentially to dense-cored amyloid deposition, regional differences in cerebral cortical uptake between [(11)C]PIB and [(18)F]FACT might be due to differences in regional distribution between diffuse and dense-cored amyloid plaque shown in the autoradiographic and histochemical assays of postmortem AD brain sections.
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11
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Ito H, Shimada H, Shinotoh H, Takano H, Sasaki T, Nogami T, Suzuki M, Nagashima T, Takahata K, Seki C, Kodaka F, Eguchi Y, Fujiwara H, Kimura Y, Hirano S, Ikoma Y, Higuchi M, Kawamura K, Fukumura T, Böö ÉL, Farde L, Suhara T. Quantitative Analysis of Amyloid Deposition in Alzheimer Disease Using PET and the Radiotracer ¹¹C-AZD2184. J Nucl Med 2014; 55:932-8. [PMID: 24732152 DOI: 10.2967/jnumed.113.133793] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 01/27/2013] [Indexed: 11/16/2022] Open
Abstract
UNLABELLED Characteristic neuropathologic changes in Alzheimer disease (AD) are amyloid-β deposits and neurofibrillary tangles. Recently, a new radioligand for amyloid senile plaques, (11)C-labeled 5-(6-{[tert-butyl(dimethyl)silyl]oxy}-1,3-benzothiazol-2-yl)pyridin-2-amine ((11)C-AZD2184), was developed, and it was reported to show rapid brain uptake followed by rapid washout. In this study, (11)C-AZD2184 binding in control subjects and AD patients was examined in more detail by compartment model analysis using a metabolite-corrected arterial input function. The accuracy of simplified quantitative methods using a reference brain region was also evaluated. METHODS After intravenous bolus injection of (11)C-AZD2184, a dynamic PET scan was obtained for 90 min in 6 control subjects and 8 AD patients. To obtain the arterial input function, arterial blood sampling and high-performance liquid chromatography analysis were performed. RESULTS Time-activity curves in all brain regions could be described using the standard 2-tissue-compartment model. The total distribution volume ratios to reference region (DVR) in cerebral cortical regions were significantly higher in AD patients than in control subjects. Although there was no conspicuous accumulation of radioactivity in white matter as compared with other amyloid radioligands, DVR values in the centrum semiovale were more than 1 for both control subjects and AD patients, suggesting binding to myelin. The standardized uptake value ratio calculated from integrated time-activity curves in brain regions and the reference region was statistically in good agreement with DVR. CONCLUSION Although the white matter binding of (11)C-AZD2184 may have some effect on cortical measurement, it can be concluded that the kinetic behavior of (11)C-AZD2184 is suitable for quantitative analysis. The standardized uptake value ratio can be used as a validated measure of (11)C-AZD2184 binding in clinical examinations without arterial input function.
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Affiliation(s)
- Hiroshi Ito
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Hitoshi Shimada
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Hitoshi Shinotoh
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Harumasa Takano
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Takeshi Sasaki
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Tsuyoshi Nogami
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Masayuki Suzuki
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Tomohisa Nagashima
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Keisuke Takahata
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Chie Seki
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Fumitoshi Kodaka
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Yoko Eguchi
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Hironobu Fujiwara
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Yasuyuki Kimura
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Shigeki Hirano
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Yoko Ikoma
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Makoto Higuchi
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Kazunori Kawamura
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Toshimitsu Fukumura
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
| | - Éva Lindström Böö
- AstraZeneca Translational Sciences Center, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Lars Farde
- AstraZeneca Translational Sciences Center, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Tetsuya Suhara
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; and
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12
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Kikuchi T, Okamura T, Wakizaka H, Okada M, Odaka K, Yui J, Tsuji AB, Fukumura T, Zhang MR. OAT3-mediated extrusion of the 99mTc-ECD metabolite in the mouse brain. J Cereb Blood Flow Metab 2014; 34:585-8. [PMID: 24496177 PMCID: PMC3982094 DOI: 10.1038/jcbfm.2014.20] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/09/2014] [Accepted: 01/15/2014] [Indexed: 12/18/2022]
Abstract
After administration of the (99m)Tc complex with N,N'-1,2-ethylenediylbis-L-cysteine diethyl ester ((99m)Tc-ECD), a brain perfusion imaging agent, the radioactive metabolite is trapped in primate brain, but not in mouse and rat. Here, we investigate the involvement of metabolite extrusion by organic anion transporter 3 (OAT3), which is highly expressed at the blood-brain barrier in mice, in this species difference. The efflux rate of radioactivity in the cerebrum of Oat3(-/-) mice at later phase was 20% of that of control mice. Thus, organic anion transporters in mouse brain would be involved in the low brain retention of radioactivity after (99m)Tc-ECD administration.
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Affiliation(s)
- Tatsuya Kikuchi
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Toshimitsu Okamura
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Hidekatsu Wakizaka
- Biophysics Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Maki Okada
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Kenichi Odaka
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Joji Yui
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Atsushi B Tsuji
- Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Toshimitsu Fukumura
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Ming-Rong Zhang
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
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13
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Aung W, Jin ZH, Furukawa T, Claron M, Boturyn D, Sogawa C, Tsuji AB, Wakizaka H, Fukumura T, Fujibayashi Y, Dumy P, Saga T. Micro–Positron Emission Tomography/Contrast-Enhanced Computed Tomography Imaging of Orthotopic Pancreatic Tumor–Bearing Mice Using the α
v
β
3
Integrin Tracer
64
Cu-Labeled Cyclam-RAFT-c(-RGDfK-)
4. Mol Imaging 2013. [PMID: 23981783 DOI: 10.2310/7290.2013.00054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Winn Aung
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Zhao-Hui Jin
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Takako Furukawa
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Michael Claron
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Didier Boturyn
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Chizuru Sogawa
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Atsushi B. Tsuji
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Hidekatsu Wakizaka
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Toshimitsu Fukumura
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Yasuhisa Fujibayashi
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Pascal Dumy
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
| | - Tsuneo Saga
- From the Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, and Département de Chimie Moléculaire, UMR5250, CNRS, Université Joseph Fourier, Grenoble, France
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14
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Hanyu M, Takada Y, Hashimoto H, Kawamura K, Zhang MR, Fukumura T. Carbon-11 radiolabeling of an oligopeptide containing tryptophan hydrochloride via a Pictet-Spengler reaction using carbon-11 formaldehyde. J Pept Sci 2013; 19:663-8. [PMID: 23946162 DOI: 10.1002/psc.2546] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/15/2013] [Accepted: 07/17/2013] [Indexed: 02/03/2023]
Abstract
A procedure for the synthesis of a(11)C-labeled oligopeptide containing [1-(11)C]1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid ([1-(11)C]Tpi) from the corresponding Trp•HCl-containing peptides has been developed involving a Pictet-Spengler reaction with [(11) C]formaldehyde. The synthesis of [1-(11)C]Tpi from Trp and [(11)C]formaldehyde was examined as a model reaction with the aim of developing a facile and effective method for the labeling of peptides with carbon-11. The Pictet-Spengler reaction of Trp and [(11)C]formaldehyde in acidic media (TsOH or HCl) afforded the desired [1-(11)C]Tpi in a moderate radiochemical yield. Herein, the application of a Pictet-Spengler reaction to an aqueous solution of Trp•HCl gave the desired product with a radiochemical yield of 45.2%. The RGD peptide cyclo[Arg-Gly-Asp-D-Tyr-Lys] was then selected as a substrate for the labeling reaction with [(11)C]formaldehyde. The radiolabeling of a Trp•HCl-containing RGD peptide using the Pictet-Spengler reaction was successful. Furthermore, the remote-controlled synthesis of a [1-(11)C]Tpi-containing RGD peptide was attempted by using an automatic production system to generate [(11)C]CH3 I. The radiochemical yield of the [1-(11) C]Tpi-containing RGD at the end of synthesis (EOS) was 5.9 ± 1.9% (n = 4), for a total synthesis time of about 35 min. The specific activity was 85.7 ± 9.4 GBq/µmol at the EOS.
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Affiliation(s)
- Masayuki Hanyu
- Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Science, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
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15
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Oi N, Suzuki M, Terauchi T, Tokunaga M, Nakatani Y, Yamamoto N, Fukumura T, Zhang MR, Suhara T, Higuchi M. Synthesis and Evaluation of Novel Radioligands for Positron Emission Tomography Imaging of the Orexin-2 Receptor. J Med Chem 2013; 56:6371-85. [DOI: 10.1021/jm400772t] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Norihito Oi
- Tsukuba Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba-shi, Ibaraki
300-2635, Japan
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
- Graduate School of Medicine, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai
980-8574, Japan
| | - Michiyuki Suzuki
- Tsukuba Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba-shi, Ibaraki
300-2635, Japan
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Taro Terauchi
- Tsukuba Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba-shi, Ibaraki
300-2635, Japan
| | - Masaki Tokunaga
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Yosuke Nakatani
- Tsukuba Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba-shi, Ibaraki
300-2635, Japan
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
- Graduate School of Medicine, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai
980-8574, Japan
| | - Noboru Yamamoto
- Tsukuba Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba-shi, Ibaraki
300-2635, Japan
| | - Toshimitsu Fukumura
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Ming-Rong Zhang
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Tetsuya Suhara
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
- Graduate School of Medicine, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai
980-8574, Japan
| | - Makoto Higuchi
- Molecular
Imaging Center, National Institute of Radiological Sciences, 4-9-1
Anagawa, Inage-ku, Chiba 263-8555, Japan
- Graduate School of Medicine, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai
980-8574, Japan
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16
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Yoshii Y, Furukawa T, Oyama N, Hasegawa Y, Kiyono Y, Nishii R, Waki A, Tsuji AB, Sogawa C, Wakizaka H, Fukumura T, Yoshii H, Fujibayashi Y, Lewis JS, Saga T. Fatty acid synthase is a key target in multiple essential tumor functions of prostate cancer: uptake of radiolabeled acetate as a predictor of the targeted therapy outcome. PLoS One 2013; 8:e64570. [PMID: 23741342 PMCID: PMC3669310 DOI: 10.1371/journal.pone.0064570] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Accepted: 04/15/2013] [Indexed: 11/18/2022] Open
Abstract
Fatty acid synthase (FASN) expression is elevated in several cancers, and this over-expression is associated with poor prognosis. Inhibitors of FASN, such as orlistat, reportedly show antitumor effects against cancers that over-express FASN, making FASN a promising therapeutic target. However, large variations in FASN expression levels in individual tumors have been observed, and methods to predict FASN-targeted therapy outcome before treatment are required to avoid unnecessary treatment. In addition, how FASN inhibition affects tumor progression remains unclear. Here, we showed the method to predict FASN-targeted therapy outcome using radiolabeled acetate uptake and presented mechanisms of FASN inhibition with human prostate cancer cell lines, to provide the treatment strategy of FASN-targeted therapy. We revealed that tumor uptake of radiolabeled acetate reflected the FASN expression levels and sensitivity to FASN-targeted therapy with orlistat in vitro and in vivo. FASN-targeted therapy was noticeably effective against tumors with high FASN expression, which was indicated by high acetate uptake. To examine mechanisms, we established FASN knockdown prostate cancer cells by transduction of short-hairpin RNA against FASN and investigated the characteristics by analyses on morphology and cell behavior and microarray-based gene expression profiling. FASN inhibition not only suppressed cell proliferation but prevented pseudopodia formation and suppressed cell adhesion, migration, and invasion. FASN inhibition also suppressed genes involved in production of intracellular second messenger arachidonic acid and androgen hormones, both of which promote tumor progression. Collectively, our data demonstrated that uptake of radiolabeled acetate is a useful predictor of FASN-targeted therapy outcome. This suggests that [1-(11)C]acetate positron emission tomography (PET) could be a powerful tool to accomplish personalized FASN-targeted therapy by non-invasive visualization of tumor acetate uptake and selection of responsive tumors. FASN-targeted therapy could be an effective treatment to suppress multiple steps related to tumor progression in prostate cancers selected by [1-(11)C]acetate PET.
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Affiliation(s)
- Yukie Yoshii
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan.
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17
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Ohya T, Kikuchi T, Fukumura T, Zhang MR, Irie T. Non-input analysis for incomplete trapping irreversible tracer with PET. Nucl Med Biol 2013; 40:664-9. [PMID: 23582563 DOI: 10.1016/j.nucmedbio.2013.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/26/2013] [Accepted: 02/27/2013] [Indexed: 11/19/2022]
Abstract
INTRODUCTION When using metabolic trapping type tracers, the tracers are not always trapped in the target tissue; i.e., some are completely trapped in the target, but others can be eliminated from the target tissue at a measurable rate. The tracers that can be eliminated are termed 'incomplete trapping irreversible tracers'. These incomplete trapping irreversible tracers may be clinically useful when the tracer β-value, the ratio of the tracer (metabolite) elimination rate to the tracer efflux rate, is under approximately 0.1. In this study, we propose a non-input analysis for incomplete trapping irreversible tracers based on the shape analysis (Shape), a non-input analysis used for irreversible tracers. METHODS A Monte Carlo simulation study based on experimental monkey data with two actual PET tracers (a complete trapping irreversible tracer [(11)C]MP4A and an incomplete trapping irreversible tracer [(18)F]FEP-4MA) was performed to examine the effects of the environmental error and the tracer elimination rate on the estimation of the k3-parameter (corresponds to metabolic rate) using Shape (original) and modified Shape (M-Shape) analysis. The simulation results were also compared with the experimental results obtained with the two PET tracers. RESULTS When the tracer β-value was over 0.03, the M-Shape method was superior to the Shape method for the estimation of the k3-parameter. The simulation results were also in reasonable agreement with the experimental ones. CONCLUSIONS M-Shape can be used as the non-input analysis of incomplete trapping irreversible tracers for PET study.
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Affiliation(s)
- Tomoyuki Ohya
- Molecular Probe Group, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba 263-8555, Japan.
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18
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Yamasaki T, Fujinaga M, Kawamura K, Yui J, Hatori A, Ohya T, Xie L, Wakizaka H, Yoshida Y, Fukumura T, Zhang MR. In Vivo Measurement of the Affinity and Density of Metabotropic Glutamate Receptor Subtype 1 in Rat Brain Using 18F-FITM in Small-Animal PET. J Nucl Med 2012; 53:1601-7. [DOI: 10.2967/jnumed.112.105908] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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19
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Affiliation(s)
| | - Masayuki Hanyu
- Molecular Probe Program, Molecular Imaging Center; National Institute of Radiological Science; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Kotaro Nagatsu
- Molecular Probe Program, Molecular Imaging Center; National Institute of Radiological Science; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Toshimitsu Fukumura
- Molecular Probe Program, Molecular Imaging Center; National Institute of Radiological Science; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
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20
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Saijo T, Maeda J, Okauchi T, Maeda JI, Morio Y, Kuwahara Y, Suzuki M, Goto N, Fukumura T, Suhara T, Higuchi M. Presynaptic selectivity of a ligand for serotonin 1A receptors revealed by in vivo PET assays of rat brain. PLoS One 2012; 7:e42589. [PMID: 22880045 PMCID: PMC3413639 DOI: 10.1371/journal.pone.0042589] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 07/10/2012] [Indexed: 11/19/2022] Open
Abstract
A novel investigational antidepressant with high affinity for the serotonin transporter and the serotonin 1A (5-HT(1A)) receptor, called Wf-516 (structural formula: (2S)-1-[4-(3,4-dichlorophenyl)piperidin-1-yl]-3-[2-(5-methyl-1,3,4-oxadiazol-2-yl)benzo[b]furan-4-yloxy]propan-2-ol monohydrochloride), has been found to exert a rapid therapeutic effect, although the mechanistic basis for this potential advantage remains undetermined. We comparatively investigated the pharmacokinetics and pharmacodynamics of Wf-516 and pindolol by positron emission tomographic (PET) and autoradiographic assays of rat brains in order to elucidate their molecular interactions with presynaptic and postsynaptic 5-HT(1A) receptors. In contrast to the full receptor occupancy by pindolol in PET measurements, the binding of Wf-516 to 5-HT(1A) receptors displayed limited capacity, with relatively high receptor occupancy being achieved in regions predominantly containing presynaptic receptors. This selectivity was further proven by PET scans of neurotoxicant-treated rats deficient in presynaptic 5-HT(1A) receptors. In addition, [(35)S]guanosine 5'-O-[γ-thio]triphosphate autoradiography indicated a partial agonistic ability of Wf-516 for 5-HT(1A) receptors. This finding has lent support to reports that diverse partial agonists for 5-HT(1A) receptors exert high sensitivity for presynaptic components. Thus, the present PET data suggest a relatively high capacity of presynaptic binding sites for partial agonists. Since our in vitro and ex vivo autoradiographies failed to illustrate these distinct features of Wf-516, in vivo PET imaging is considered to be, thus far, the sole method capable of pharmacokinetically demonstrating the unique actions of Wf-516 and similar new-generation antidepressants.
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Affiliation(s)
- Takeaki Saijo
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
- Department of Molecular Neuroimaging, Tohoku University School of Medicine, Sendai, Japan
- DMPK Research Laboratory, Mitsubishi Tanabe Pharma Corporation, Kisarazu, Japan
| | - Jun Maeda
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Takashi Okauchi
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Jun-ichi Maeda
- Research Quality Assurance Department, Mitsubishi Tanabe Pharma Corporation, Yokohama, Japan
| | - Yasunori Morio
- Development Project Management Department, Mitsubishi Tanabe Pharma Corporation, Tokyo, Japan
| | - Yasuhiro Kuwahara
- Advanced Medical Research Laboratory, Mitsubishi Tanabe Pharma Corporation, Yokohama, Japan
| | - Masayuki Suzuki
- DMPK Research Laboratory, Mitsubishi Tanabe Pharma Corporation, Kisarazu, Japan
| | - Nobuharu Goto
- Early Stage Clinical Research Center, Mitsubishi Tanabe Pharma Corporation, Tokyo, Japan
| | - Toshimitsu Fukumura
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - Tetsuya Suhara
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
- Department of Molecular Neuroimaging, Tohoku University School of Medicine, Sendai, Japan
| | - Makoto Higuchi
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
- Department of Molecular Neuroimaging, Tohoku University School of Medicine, Sendai, Japan
- * E-mail:
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21
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Sato Y, Yamada T, Suzuki T, Toramatsu C, Yunoki A, Hino Y, Harano H, Matsumoto T, Shimoyama T, Kurosawa T, Kato M, Kudo K, Matsumoto M, Suzuki K, Hatakeyama S, Doi K, Saito Y, Suzuki K, Fukumura T, Miyamoto K, Iwamoto A, Endo K, Matsubara S. Remote calibration of ionization chambers for radioactivity calibration. J NUCL SCI TECHNOL 2012. [DOI: 10.1080/00223131.2012.703947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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22
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Nagatsu K, Suzuki H, Fukada M, Minegishi K, Tsuji A, Fukumura T. An alumina ceramic target vessel for the remote production of metallic radionuclides by in situ target dissolution. Nucl Med Biol 2012; 39:1281-5. [PMID: 22727820 DOI: 10.1016/j.nucmedbio.2012.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 05/10/2012] [Accepted: 05/19/2012] [Indexed: 11/26/2022]
Abstract
INTRODUCTION As the use of metallic radionuclides increases, so does the demand for a simple production method. In this study, we demonstrated an in situ target processing concept for automated metallic radionuclide production without the use of any robotic device. METHODS An alumina ceramic vessel for a vertical irradiation system was designed and developed. The ceramic vessel was evaluated by the production of Zr-89 using an yttrium powder target. The irradiated Y was dissolved remotely in HCl in the ceramic vessel and transferred as a solution to a hotcell through a Teflon tube. The crude Zr-89 was then purified by an automated apparatus. The Zr-89 was eluted with 100 μL of oxalic acid (solution) as the final product. RESULTS The ceramic vessel gave a sufficient yield of Zr-89 (57±11MBq/μAh), showed good operability, and could be reused up to 10 times. With nominal irradiation (10μA×2h) in ~90 μL, the product (~940MBq) was obtained with >99.9% radionuclidic purity. CONCLUSION The combination of the ceramic vessel and vertical irradiation has great potential for the remote production of various metallic radionuclides.
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Affiliation(s)
- Kotaro Nagatsu
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
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23
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Liu F, Makino T, Yamasaki T, Ueno K, Tsukazaki A, Fukumura T, Kong Y, Kawasaki M. Ultrafast time-resolved faraday rotation in EuO thin films. Phys Rev Lett 2012; 108:257401. [PMID: 23004656 DOI: 10.1103/physrevlett.108.257401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Indexed: 06/01/2023]
Abstract
We have investigated the ultrafast spin dynamics in EuO thin films by time-resolved Faraday rotation spectroscopy. The photoinduced magnetization is found to be increased in a transient manner, accompanied with subsequent demagnetization. The dynamical magnetization enhancement showed a maximum slightly below the Curie temperature with prolonged tails toward both lower and higher temperatures and dominates the demagnetization counterpart at 55 K. The magnetization enhancement component decays in ~1 ns. The realization of the transient collective ordering is attributable to the enhancement of the f-d exchange interaction.
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Affiliation(s)
- F Liu
- Quantum Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
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24
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Sasaki T, Ito H, Kimura Y, Arakawa R, Takano H, Seki C, Kodaka F, Fujie S, Takahata K, Nogami T, Suzuki M, Fujiwara H, Takahashi H, Nakao R, Fukumura T, Varrone A, Halldin C, Nishikawa T, Suhara T. Quantification of Dopamine Transporter in Human Brain Using PET with 18F-FE-PE2I. J Nucl Med 2012; 53:1065-73. [DOI: 10.2967/jnumed.111.101626] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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25
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Jin ZH, Furukawa T, Claron M, Boturyn D, Coll JL, Fukumura T, Fujibayashi Y, Dumy P, Saga T. Positron emission tomography imaging of tumor angiogenesis and monitoring of antiangiogenic efficacy using the novel tetrameric peptide probe 64Cu-cyclam-RAFT-c(-RGDfK-)4. Angiogenesis 2012; 15:569-80. [PMID: 22644563 PMCID: PMC3496517 DOI: 10.1007/s10456-012-9281-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 05/08/2012] [Indexed: 02/06/2023]
Abstract
64Cu-cyclam-RAFT-c(-RGDfK-)4 is a novel multimeric positron emission tomography (PET) probe for αVβ3 integrin imaging. Its uptake and αVβ3 expression in tumors showed a linear correlation. Since αVβ3 integrin is strongly expressed on activated endothelial cells during angiogenesis, we aimed to determine whether 64Cu-cyclam-RAFT-c(-RGDfK-)4 PET can be used to image tumor angiogenesis and monitor the antiangiogenic effect of a novel multi-targeted tyrosine kinase inhibitor, TSU-68. Athymic nude mice bearing human hepatocellular carcinoma HuH-7 xenografts, which expressed negligible αVβ3 levels on the tumor cells, received intraperitoneal injections of TSU-68 or the vehicle for 14 days. Antiangiogenic effects were determined at the end of therapy in terms of 64Cu-cyclam-RAFT-c(-RGDfK-)4 uptake evaluated using PET, biodistribution assay, and autoradiography, and they were compared with microvessel density (MVD) determined by CD31 immunostaining. 64Cu-cyclam-RAFT-c(-RGDfK-)4 PET enabled clear tumor visualization by targeting the vasculature, and the biodistribution assay indicated high tumor-to-blood and tumor-to-muscle ratios of 31.6 ± 6.3 and 6.7 ± 1.1, respectively, 3 h after probe injection. TSU-68 significantly slowed tumor growth and reduced MVD; these findings were consistent with a significant reduction in the tumor 64Cu-cyclam-RAFT-c(-RGDfK-)4 uptake. Moreover, a linear correlation was observed between tumor MVD and the corresponding standardized uptake value (SUV) (r = 0.829, P = 0.011 for SUVmean; r = 0.776, P = 0.024 for SUVmax) determined by quantitative PET. Autoradiography and immunostaining showed that the distribution of intratumoral radioactivity and tumor vasculature corresponded. We concluded that 64Cu-cyclam-RAFT-c(-RGDfK-)4 PET can be used for in vivo angiogenesis imaging and monitoring of tumor response to antiangiogenic therapy.
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Affiliation(s)
- Zhao-Hui Jin
- Molecular Imaging Center, National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba, 263-8555, Japan.
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26
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Asakawa C, Ogawa M, Fujinaga M, Kumata K, Xie L, Yamasaki T, Yui J, Fukumura T, Zhang MR. Utilization of [11C]phosgene for radiosynthesis of N-(2-{3-[3,5-bis(trifluoromethyl)]phenyl[11C]ureido}ethyl)glycyrrhetinamide, an inhibitory agent for proteasome and kinase in tumors. Bioorg Med Chem Lett 2012; 22:3594-7. [PMID: 22546673 DOI: 10.1016/j.bmcl.2012.04.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 04/05/2012] [Accepted: 04/10/2012] [Indexed: 11/26/2022]
Abstract
N-(2-{3-[3,5-Bis(trifluoromethyl)]phenylureido}ethyl)glycyrrhetinamide (2), an ureido-substituted derivative of glycyrrhetinic acid (1), has been reported to display potent inhibitory activity for proteasome and kinase, which are overexpressed in tumors. In this study, we labeled this unsymmetrical urea 2 using [(11)C]phosgene ([(11)C]COCl(2)) as a labeling agent with the expectation that [(11)C]2 could become a positron emission tomography ligand for the imaging of proteasome and kinase in tumors. The strategy for the radiosynthesis of [(11)C]2 was to react hydrochloride of 3,5-bis(trifluoromethyl)aniline (4·HCl) with [(11)C]COCl(2) to possibly give isocyanate [(11)C]6, followed by the reaction of [(11)C]6 with N-(2-aminoethyl)glycyrrhetinamide (3).
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Affiliation(s)
- Chiharu Asakawa
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan
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Fujinaga M, Yamasaki T, Yui J, Hatori A, Xie L, Kawamura K, Asagawa C, Kumata K, Yoshida Y, Ogawa M, Nengaki N, Fukumura T, Zhang MR. Synthesis and evaluation of novel radioligands for positron emission tomography imaging of metabotropic glutamate receptor subtype 1 (mGluR1) in rodent brain. J Med Chem 2012; 55:2342-52. [PMID: 22316010 DOI: 10.1021/jm201590g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We designed three novel positron emission tomography ligands, N-(4-(6-(isopropylamino)pyrimidin-4-yl)-1,3-thiazol-2-yl)-4-[(11)C]methoxy-N-methylbenzamide ([(11)C]6), 4-[(18)F]fluoroethoxy-N-[4-[6-(isopropylamino)pyrimidin-4-yl]-1,3-thiazol-2-yl]-N-methylbenzamide ([(18)F]7), and 4-[(18)F]fluoropropoxy-N-[4-[6-(isopropylamino)pyrimidin-4-yl]-1,3-thiazol-2-yl]-N-methylbenzamide ([(18)F]8), for imaging metabotropic glutamate receptor type 1 (mGluR1) in rodent brain. Unlabeled compound 6 was synthesized by benzoylation of 4-pyrimidinyl-2-methylaminothiazole 10, followed by reaction with isopropylamine. Removal of the methyl group in 6 gave phenol precursor 12 for radiosynthesis. Two fluoroalkoxy analogues 7 and 8 were prepared by reacting 12 with tosylates 13 and 14. Radioligands [(11)C]6, [(18)F]7, and [(18)F]8 were synthesized by O-[(11)C]methylation or [(18)F]fluoroalkylation of 12. Compound 6 showed high in vitro binding affinity for mGluR1, whereas 7 and 8 had weak affinity. Autoradiography using rat brain sections showed that [(11)C]6 binding is aligned with the reported distribution of mGluR1 with high specific binding in the cerebellum and thalamus. PET study with [(11)C]6 in rats showed high brain uptake and a similar distribution pattern to that in autoradiography, indicating the usefulness of [(11)C]6 for imaging brain mGluR1.
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Affiliation(s)
- Masayuki Fujinaga
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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Kawamura K, Kimura Y, Yui J, Wakizaka H, Yamasaki T, Hatori A, Kumata K, Fujinaga M, Yoshida Y, Ogawa M, Nengaki N, Fukumura T, Zhang MR. PET study using [11C]FTIMD with ultra-high specific activity to evaluate I2-imidazoline receptors binding in rat brains. Nucl Med Biol 2012; 39:199-206. [DOI: 10.1016/j.nucmedbio.2011.07.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 06/29/2011] [Accepted: 07/26/2011] [Indexed: 10/17/2022]
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Hayashi K, Furutsuka K, Ito T, Muto M, Aki H, Fukumura T, Suzuki K. Fully automated synthesis and purification of 4-(2′-methoxyphenyl)-1-[2′-(N-2″-pyridinyl)-p-[18F]fluorobenzamido]ethylpiperazine. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.1958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
| | | | | | - Masatoshi Muto
- Tokyo Nuclear Service Co., Ltd.; 1-3-5 Taito, Taito-ku; Tokyo; 110-0016; Japan
| | - Hatsumi Aki
- Department of Pharmaceuticals, Faculty of Pharmaceutical Sciences; Fukuoka University; 8-19-1 Nanakuma, Jonan-ku; Fukuoka; 814-80; Japan
| | - Toshimitsu Fukumura
- Radiopharmaceutical Production Team, Molecular Probe Group, Molecular Imaging Center; National Institute of Radiological Sciences (NIRS); 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Kazutoshi Suzuki
- Radiopharmaceutical Production Team, Molecular Probe Group, Molecular Imaging Center; National Institute of Radiological Sciences (NIRS); 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
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Higuchi M, Maeda J, Ji B, Tokunaga M, Zhang MR, Maruyama M, Ono M, Fukumura T, Suhara T. PET applications in animal models of neurodegenerative and neuroinflammatory disorders. Curr Top Behav Neurosci 2012; 11:45-64. [PMID: 22016108 DOI: 10.1007/7854_2011_167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Studies on hereditary neurological disorders such as familial Alzheimer's disease (AD) have revealed abnormalities of pathogenic proteins causative of neurodegeneration, while molecular initiators of sporadic neuropsychiatric conditions remain unidentified. Such disorders are characterized by collections of molecular abnormalities that may be critically involved in synaptic dysfunctions and other deteriorations in neurons. Diverse classes of radiochemicals designed for positron emission tomographic (PET) imaging facilitate delineation of mechanistic links among key molecules in these processes by tracking their spatiotemporal correlations. This assay technique is of particular utility when applied to rodent and nonhuman primate models given their suitability for invasive genetic and pharmacological interventions. In addition, the detection of neurochemical and neuropathological changes by PET can be examined in laboratory animals when combined with invasive antemortem and postmortem investigations such as in vivo microdialysis, electrophysiological and histopathological techniques. This review primarily covers the use of small animal models of brain disorders using PET to elucidate etiological molecular cascades to facilitate in turn the search for diagnostic and therapeutic agents applicable to AD and related disorders in humans.
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Affiliation(s)
- Makoto Higuchi
- Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan,
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Asakawa C, Ogawa M, Kumata K, Fujinaga M, Yamasaki T, Xie L, Yui J, Kawamura K, Fukumura T, Zhang MR. Radiosynthesis of three [11C]ureido-substituted benzenesulfonamides as PET probes for carbonic anhydrase IX in tumors. Bioorg Med Chem Lett 2011; 21:7017-20. [PMID: 22014831 DOI: 10.1016/j.bmcl.2011.09.102] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 09/21/2011] [Accepted: 09/27/2011] [Indexed: 11/26/2022]
Abstract
Three ureido-substituted benzenesulfonamides 1a-c have been developed as potent inhibitors for carbonic anhydrase IX, which is overexpressed in hypoxic tumors. In this study, we labeled these unsymmetrical ureas 1a-c using [(11)C]phosgene ([(11)C]COCl(2)) as a labeling agent with the expectation that [(11)C]1a-c could become promising positron tomography probes for imaging carbonic anhydrase IX in tumors. The strategy for radiosynthesis of [(11)C]1a-c was to react hydrochloride of anilines 2a-c with [(11)C]COCl(2) to give isocyanate [(11)C]4a-c, followed by a reaction with 4-aminobenzenesulfonamide (3).
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Affiliation(s)
- Chiharu Asakawa
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan
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Kobayashi N, Odaka K, Uehara T, Imanaka-Yoshida K, Kato Y, Oyama H, Tadokoro H, Akizawa H, Tanada S, Hiroe M, Fukumura T, Komuro I, Arano Y, Yoshida T, Irie T. Toward in vivo imaging of heart disease using a radiolabeled single-chain Fv fragment targeting tenascin-C. Anal Chem 2011; 83:9123-30. [PMID: 22074352 DOI: 10.1021/ac202159p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Antibodies specific to a particular target molecule can be used as analytical reagents, not only for in vitro immunoassays but also for noninvasive in vivo imaging, e.g., immunoscintigraphies. In the latter case, it is important to reduce the size of antibody molecules in order to achieve suitable in vivo "diagnostic kinetics" and generate higher-resolution images. For these purposes, single-chain Fv fragments (scFvs; M(r) < 30 kDa) have greater potential than intact immunoglobulins (~150 kDa) or Fab (or Fab') fragments (~50 kDa). Our recent observation of enhanced tenascin-C (Tnc) expression at sites of cardiac repair after myocardial infarction prompted us to develop a radiolabeled scFv against Tnc for in vivo imaging of heart disease. We cloned the genes encoding the heavy and light chain variable domains of the mouse anti-Tnc monoclonal antibody 4F10, and combined them to create a single gene. The resulting scFv-4F10 gene was expressed in E. coli cells to produce soluble scFv proteins. scFv-4F10 has an affinity for Tnc (K(a) = 3.5 × 10(7) M(-1)), similar to the Fab fragment of antibody 4F10 (K(a) = 1.3 × 10(7) M(-1)) and high enough to be of practical use. A cysteine residue was then added to the C-terminus to achieve site-specific (111)In labeling via a chelating group. The resulting (111)In-labeled scFv was administered to a rat model of acute myocardial infarction. Biodistribution and quantitative autoradiographic studies indicated higher uptake of the radioactivity at the infarcted myocardium than the noninfarcted one. Single photon emission computed tomography (SPECT) provided in vivo cardiac images that coincided with the ex vivo observations. Our results will promote advances in diagnostic strategies for heart disease.
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Affiliation(s)
- Norihiro Kobayashi
- Kobe Pharmaceutical University, 4-19-1, Motoyama-Kitamachi, Higashinada-ku, Kobe 658-8558, Japan.
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Guerra Gómez FL, Takada Y, Hosoi R, Momosaki S, Yanamoto K, Nagatsu K, Suzuki H, Zhang MR, Inoue O, Arano Y, Fukumura T. Production and purification of the positron emitter zinc-63. J Labelled Comp Radiopharm 2011. [DOI: 10.1002/jlcr.1943] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Rie Hosoi
- Division of Health Sciences, Graduate School of Medicine; Osaka University; Suita; Osaka; 565-0871; Japan
| | - Sotaro Momosaki
- Division of Health Sciences, Graduate School of Medicine; Osaka University; Suita; Osaka; 565-0871; Japan
| | - Kazuhiko Yanamoto
- Division of Health Sciences, Graduate School of Medicine; Osaka University; Suita; Osaka; 565-0871; Japan
| | - Kotaro Nagatsu
- Molecular Imaging Center; National Institute of Radiological Sciences; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Hisashi Suzuki
- Molecular Imaging Center; National Institute of Radiological Sciences; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Ming-Rong Zhang
- Molecular Imaging Center; National Institute of Radiological Sciences; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
| | - Osamu Inoue
- Division of Health Sciences, Graduate School of Medicine; Osaka University; Suita; Osaka; 565-0871; Japan
| | - Yasushi Arano
- Department of Molecular Imaging and Radiotherapy, Graduate School of Pharmaceutical Sciences; Chiba University; 1-8-1 Inohana, Chuo-ku; Chiba; 260-8675; Japan
| | - Toshimitsu Fukumura
- Molecular Imaging Center; National Institute of Radiological Sciences; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
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Kumata K, Yui J, Hatori A, Fujinaga M, Yanamoto K, Yamasaki T, Kawamura K, Wakizaka H, Nengaki N, Yoshida Y, Ogawa M, Fukumura T, Zhang MR. Synthesis and Evaluation of Novel Carbon-11 Labeled Oxopurine Analogues for Positron Emission Tomography Imaging of Translocator Protein (18 kDa) in Peripheral Organs. J Med Chem 2011; 54:6040-9. [DOI: 10.1021/jm200516a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katsushi Kumata
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Joji Yui
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Akiko Hatori
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Masayuki Fujinaga
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Kazuhiko Yanamoto
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Tomoteru Yamasaki
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Kazunori Kawamura
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Hidekatsu Wakizaka
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Nobuki Nengaki
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., 5-9-11 Kitashinagawa, Shinagawa-ku, Tokyo 141-8686, Japan
| | - Yuichiro Yoshida
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., 5-9-11 Kitashinagawa, Shinagawa-ku, Tokyo 141-8686, Japan
| | - Masanao Ogawa
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., 5-9-11 Kitashinagawa, Shinagawa-ku, Tokyo 141-8686, Japan
| | - Toshimitsu Fukumura
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Ming-Rong Zhang
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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Fujinaga M, Maeda J, Yui J, Hatori A, Yamasaki T, Kawamura K, Kumata K, Yoshida Y, Nagai Y, Higuchi M, Suhara T, Fukumura T, Zhang MR. Characterization of 1-(2-[18F]fluoro-3-pyridyl)-4-(2-isopropyl-1-oxo- isoindoline-5-yl)-5-methyl-1H-1,2,3-triazole, a PET ligand for imaging the metabotropic glutamate receptor type 1 in rat and monkey brains. J Neurochem 2011; 121:115-24. [DOI: 10.1111/j.1471-4159.2011.07348.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Kawamura K, Yamasaki T, Konno F, Yui J, Hatori A, Yanamoto K, Wakizaka H, Takei M, Kimura Y, Fukumura T, Zhang MR. Evaluation of limiting brain penetration related to P-glycoprotein and breast cancer resistance protein using [(11)C]GF120918 by PET in mice. Mol Imaging Biol 2011; 13:152-60. [PMID: 20379788 DOI: 10.1007/s11307-010-0313-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE GF120918 has a high inhibitory effect on P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). We developed [(11)C]GF120918 as a positron emission tomography (PET) probe to assess if dual modulation of P-gp and BCRP is useful to evaluate brain penetration. PROCEDURES PET studies using [(11)C]GF120918 were conducted on P-gp and/or Bcrp knockout mice as well as wild-type mice. RESULTS In PET studies, the AUC(brain) ([0-60 min]) and K (1) value in P-gp/Bcrp knockout mice were nine- and 26-fold higher than that in wild-type mice, respectively. These results suggest that brain penetration of [(11)C]GF120918 is related to modulation of P-gp and BCRP and is limited by two transporters working together. CONCLUSIONS PET using [(11)C]GF120918 may be useful for evaluating the function of P-gp and BCRP. PET using P-gp/Bcrp knockout mice may be an effective method to understand the overall contributions the functions of P-gp and BCRP.
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Affiliation(s)
- Kazunori Kawamura
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
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Ohya T, Okamura T, Nagai Y, Fukushi K, Irie T, Suhara T, Zhang MR, Fukumura T, Kikuchi T. Effect of radiolabeled metabolite elimination from the brain on the accuracy of cerebral enzyme activity estimation using positron emission tomography with substrate tracers. Neuroimage 2011; 56:1105-10. [DOI: 10.1016/j.neuroimage.2011.02.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 01/27/2011] [Accepted: 02/09/2011] [Indexed: 11/29/2022] Open
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Yamada Y, Ueno K, Fukumura T, Yuan HT, Shimotani H, Iwasa Y, Gu L, Tsukimoto S, Ikuhara Y, Kawasaki M. Electrically Induced Ferromagnetism at Room Temperature in Cobalt-Doped Titanium Dioxide. Science 2011; 332:1065-7. [DOI: 10.1126/science.1202152] [Citation(s) in RCA: 404] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Singh VR, Sakamoto Y, Kataoka T, Kobayashi M, Yamazaki Y, Fujimori A, Chang FH, Huang DJ, Lin HJ, Chen CT, Toyosaki H, Fukumura T, Kawasaki M. Bulk and surface magnetization of Co atoms in rutile Ti(1-x)Co(x)O(2-δ) thin films revealed by x-ray magnetic circular dichroism. J Phys Condens Matter 2011; 23:176001. [PMID: 21483080 DOI: 10.1088/0953-8984/23/17/176001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have studied magnetism in Ti(1-x)Co(x)O(2-δ) thin films with various x and δ by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L(2, 3) absorption edges. The estimated ferromagnetic moment by XMCD was 0.15-0.24 µ(B)/Co at the surface, while in the bulk it was 0.82-2.25 µ(B)/Co, which is in the same range as the saturation magnetization of 1.0-1.5 µ(B)/Co. These results suggest an intrinsic origin of the ferromagnetism. The smaller moment of the Co atom at the surface is an indication of a magnetically dead layer of a few nanometers thick at the surface of the thin films.
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Affiliation(s)
- V R Singh
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan.
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Hatori A, Yui J, Yanamoto K, Yamasaki T, Kawamura K, Takei M, Arai T, Fukumura T, Zhang MR. Determination of radioactivity in infant, juvenile and adult rat brains after injection of anti-influenza drug [11C]oseltamivir using PET and autoradiography. Neurosci Lett 2011; 495:187-91. [DOI: 10.1016/j.neulet.2011.03.055] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 02/28/2011] [Accepted: 03/19/2011] [Indexed: 11/30/2022]
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Yamasaki T, Fujinaga M, Yoshida Y, Kumata K, Yui J, Kawamura K, Hatori A, Fukumura T, Zhang MR. Radiosynthesis and preliminary evaluation of 4-[18F]fluoro-N-[4-[6-(isopropylamino)pyrimidin-4-yl]-1,3-thiazol-2-yl]-N-methylbenzamide as a new positron emission tomography ligand for metabotropic glutamate receptor subtype 1. Bioorg Med Chem Lett 2011; 21:2998-3001. [DOI: 10.1016/j.bmcl.2011.03.046] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 03/10/2011] [Accepted: 03/11/2011] [Indexed: 11/26/2022]
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Asakawa C, Ogawa M, Kumata K, Fujinaga M, Kato K, Yamasaki T, Yui J, Kawamura K, Hatori A, Fukumura T, Zhang MR. [11C]sorafenib: radiosynthesis and preliminary PET study of brain uptake in P-gp/Bcrp knockout mice. Bioorg Med Chem Lett 2011; 21:2220-3. [PMID: 21419625 DOI: 10.1016/j.bmcl.2011.03.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 02/28/2011] [Accepted: 03/01/2011] [Indexed: 11/26/2022]
Abstract
Sorafenib (Nexavar, BAY43-9006, 1) is a second-generation, orally active multikinase inhibitor that is approved for the treatment of some cancers in patients. In this Letter, we developed [(11)C]1 as a novel positron emission tomography (PET) probe, and evaluated the influence of ABC transporters-mediated efflux on brain uptake using PET with [(11)C]1 in P-glycoprotein (P-gp)/breast cancer resistance protein (Bcrp) knockout mice versus wild-type mice. [(11)C]1 was synthesized by the reaction of hydrochloride of aniline 2 with [(11)C]phosgene ([(11)C]COCl(2)) to give isocyanate [(11)C]6, followed by reaction with another aniline 3. Small-animal PET study with [(11)C]1 indicated that the radioactivity level (AUC(0-60 min), SUV×min) in the brains of P-gp/Bcrp knockout mice was about three times higher than in wild-type mice.
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Affiliation(s)
- Chiharu Asakawa
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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Kawamura K, Maeda J, Hatori A, Okauchi T, Nagai Y, Higuchi M, Suhara T, Fukumura T, Zhang MR. In vivo and in vitro imaging of I2 imidazoline receptors in the monkey brain. Synapse 2011; 65:452-5. [DOI: 10.1002/syn.20897] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hayashi K, Furutsuka K, Takei M, Muto M, Nakao R, Aki H, Suzuki K, Fukumura T. High-yield automated synthesis of [18F]fluoroazomycin arabinoside ([18F]FAZA) for hypoxia-specific tumor imaging. Appl Radiat Isot 2011; 69:1007-13. [PMID: 21420304 DOI: 10.1016/j.apradiso.2011.02.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Revised: 01/20/2011] [Accepted: 02/11/2011] [Indexed: 11/29/2022]
Abstract
The aim of this study was to develop an efficient fully automated synthesis method to achieve a high radiochemical yield of [(18)F]FAZA with a small amount of precursor. A small cartridge containing 25mg of the QMA resin was prepared and evaluated to obtain [(18)F]F(-) in a small quantity of base (K(2)CO(3)), which might allow the use of a small amount of precursor. The labeling and hydrolyzing conditions for [(18)F]FAZA synthesis were also investigated manually. No-carrier-added [(18)F]F(-) was trapped on the small QMA cartridge and eluted with a mixture of Krytofix 222 (2.26 mg, 6.0 μmol) and K(2)CO(3) (0.69 mg, 5.0 μmol) in 70% MeCN (0.4 mL). The automated synthesis of [(18)F]FAZA was optimally performed with a modified NIRS original synthesis system for clinical use, by labeling 2.5mg (5.2 μmol) of the precursor in DMSO (0.4 mL) at 120°C for 10 min, and then by hydrolyzing the (18)F-labeled intermediate with 0.1M NaOH (0.5 mL) at room temperature for 3 min. Using the above condition, the [(18)F]FAZA injection was obtained with a high radiochemical yield of 52.4±5.3% (decay-corrected, n=8) within 50.5±1.5 min.
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Affiliation(s)
- Kazutaka Hayashi
- Radiopharmaceutical Production Team, Molecular Probe Group, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan.
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Jin ZH, Furukawa T, Galibert M, Boturyn D, Coll JL, Fukumura T, Saga T, Dumy P, Fujibayashi Y. Noninvasive visualization and quantification of tumor αVβ3 integrin expression using a novel positron emission tomography probe, 64Cu-cyclam-RAFT-c(-RGDfK-)4. Nucl Med Biol 2011; 38:529-40. [PMID: 21531290 DOI: 10.1016/j.nucmedbio.2010.11.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 11/01/2010] [Accepted: 11/11/2010] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The α(V)β(3) integrin is a well-known transmembrane receptor involved in tumor invasion, angiogenesis and metastasis. Our aim was to evaluate a novel positron emission tomography (PET) probe, (64)Cu-cyclam-RAFT-c(-RGDfK-)(4), for noninvasive visualization and quantification of α(V)β(3) integrin expression. METHODS RAFT-c(-RGDfK-)(4), a tetrameric cyclic Arg-Gly-Asp (RGD)-based peptide, was conjugated with a bifunctional chelator, 1,4,8,11-tetraazacyclotetradecane (cyclam), radiolabeled with the positron emitter (64)Cu and evaluated in vitro by cell binding and competitive inhibition assays and in vivo by biodistribution and receptor blocking studies, and PET imaging. The following cell lines, human embryonic kidney HEK293(β(1)) [α(V)β(3)-negative] and HEK293(β(3)) [α(V)β(3)-overexpressing] and human glioblastoma U87MG [naturally expressing α(V)β(3)], together with their subcutaneous xenografts in athymic nude mice, were used for the present study. The expression levels of α(V)β(3) on these cell lines and tumor xenografts were analyzed by flow cytometry and sodium dodecyl sulfate-polyacrylamide gel electrophoresis/autoradiography, respectively. RESULTS (64)Cu-cyclam-RAFT-c(-RGDfK-)(4) demonstrated the in vitro and in vivo specificity for the α(V)β(3) integrin and displayed rapid blood clearance, predominantly renal excretion and low uptake in nontumor tissues. Tumor uptake of (64)Cu-cyclam-RAFT-c(-RGDfK-)(4) (3 h postinjection) in HEK293(β(3)) (high levels of α(V)β(3)), U87MG (moderate levels of α(V)β(3)) and HEK293(β(1)) (undetectable levels of α(V)β(3)) tumors was 9.35%±1.19%, 3.46%±0.45% and 1.18%±0.30% injected dose per gram, respectively, with a strong and positive correlation with the tumor α(V)β(3) expression levels (correlation coefficient=0.967; P<.0001). Positron emission tomographic images showed that α(V)β(3)-positive tumors were clearly visualized with high tumor-to-background contrast, and agreed well with the biodistribution results. CONCLUSION (64)Cu-cyclam-RAFT-c(-RGDfK-)(4) exhibits potential for noninvasively quantifying α(V)β(3) expression.
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Affiliation(s)
- Zhao-Hui Jin
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba 263-8555, Japan
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Fujinaga M, Yamasaki T, Kawamura K, Kumata K, Hatori A, Yui J, Yanamoto K, Yoshida Y, Ogawa M, Nengaki N, Maeda J, Fukumura T, Zhang MR. Synthesis and evaluation of 6-[1-(2-[18F]fluoro-3-pyridyl)-5-methyl-1H-1,2,3-triazol-4-yl]quinoline for positron emission tomography imaging of the metabotropic glutamate receptor type 1 in brain. Bioorg Med Chem 2011; 19:102-10. [DOI: 10.1016/j.bmc.2010.11.048] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 11/18/2010] [Accepted: 11/20/2010] [Indexed: 11/25/2022]
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Okada M, Nakao R, Hosoi R, Zhang MR, Fukumura T, Suzuki K, Inoue O. Microdialysis with radiometric monitoring of L-[β-11C]DOPA to assess dopaminergic metabolism: effect of inhibitors of L-amino acid decarboxylase, monoamine oxidase, and catechol-O-methyltransferase on rat striatal dialysate. J Cereb Blood Flow Metab 2011; 31:124-31. [PMID: 20407462 PMCID: PMC3049477 DOI: 10.1038/jcbfm.2010.58] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The catecholamine, dopamine (DA), is synthesized from 3,4-dihydroxy-L-phenylalanine (L-DOPA) by aromatic L-amino acid decarboxylase (AADC). Dopamine metabolism is regulated by monoamine oxidase (MAO) and catechol-O-methyltransferase (COMT). To measure dopaminergic metabolism, we used microdialysis with radiometric detection to monitor L-[β-(11)C]DOPA metabolites in the extracellular space of the rat striatum. We also evaluated the effects of AADC, MAO, and COMT inhibitors on metabolite profiles. The major early species measured after administration of L-[β-(11)C]DOPA were [(11)C]3,4-dihydroxyphenylacetic acid ([(11)C]DOPAC) and [(11)C]homovanillic acid ([(11)C]HVA) in a 1:1 ratio, which shifted toward [(11)C]HVA with time. An AADC inhibitor increased the uptake of L-[β-(11)C]DOPA and L-3-O-methyl-[(11)C]DOPA and delayed the accumulation of [(11)C]DOPAC and [(11)C]HVA. The MAO and COMT inhibitors increased the production of [(11)C]3-methoxytyramine and [(11)C]DOPAC, respectively. These results reflect the L-DOPA metabolic pathway, suggesting that this method may be useful for assessing dopaminergic metabolism.
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Affiliation(s)
- Maki Okada
- Molecular Probe Group, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan.
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Kawamura K, Yamasaki T, Konno F, Yui J, Hatori A, Yanamoto K, Wakizaka H, Ogawa M, Yoshida Y, Nengaki N, Fukumura T, Zhang MR. Synthesis and in vivo evaluation of ¹⁸F-fluoroethyl GF120918 and XR9576 as positron emission tomography probes for assessing the function of drug efflux transporters. Bioorg Med Chem 2010; 19:861-70. [PMID: 21185730 DOI: 10.1016/j.bmc.2010.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 12/01/2010] [Accepted: 12/02/2010] [Indexed: 02/04/2023]
Abstract
The purpose of this study was to synthesize two new positron emission tomography (PET) probes, N-(4-(2-(1,2,3,4-tetrahydro-6,7-dimethoxy-2-isoquinolinyl)ethyl)phenyl)-9,10-dihydro-5-[¹⁸F]fluoroethoxy-9-oxo-4-acridine carboxamide ([¹⁸F]3) and quinoline-3-carboxylic acid [2-(4-{2-[7-(2-[¹⁸F]fluoroethoxy)-6-methoxy-3,4-dihydro-1H-isoquinolin-2-yl]ethyl}phenylcarbamoyl)-4,5-dimethoxyphenyl]amide ([¹⁸F]4), and to evaluate the potential of these PET probes for assessing the function of two major drug efflux transporters, P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). [¹⁸F]3 and [¹⁸F]4 were synthesized by ¹⁸F-alkylation of each O-desmethyl precursor with [¹⁸F]2-fluoroethyl bromide for injection as PET probes. In vitro accumulation assay showed that treatment with P-gp/BCRP inhibitors (1 and 2) enhanced the intracellular accumulation capacity of P-gp- and BCRP-overexpressing MES-SA/Dx5 cells. In PET studies, the uptake (AUC(brain[0-)₆₀ (min])) of [¹⁸F]3 and [¹⁸F]4 in wild-type mice co-injected with 1 were approximately sevenfold higher than that in wild-type mice, and the uptake of [¹⁸F]3 and [¹⁸F]4 in P-gp/Bcrp knockout mice were eight- to ninefold higher than that in wild-type mice. The increased uptake of [¹⁸F]3 and [¹⁸F]4 was similar to that of parent compounds ([¹¹C]1 and [¹¹C]2) previously described, indicating that radioactivity levels in the brain after injection of [¹⁸F]3 and [¹⁸F]4 are related to the function of drug efflux transporters. Also, these results suggest that the structural difference between parent compounds ([¹¹C]1 and [¹¹C]2) and fluoroethyl analogs ([¹⁸F]3 and [¹⁸F]4) do not obviously affect the potency against drug efflux transporters. In metabolite analysis of mice, the unchanged form in the brain and plasma at 60 min after co-injection of [¹⁸F]4 plus 1 were higher (95% for brain; 81% for plasma) than that after co-injection of [¹⁸F]3 plus 1. [¹⁸F]4 is a promising PET probe to assess the function of drug efflux transporters.
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Affiliation(s)
- Kazunori Kawamura
- Department of Molecular Probes, Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan.
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Yoshida C, Tsuji AB, Sudo H, Sugyo A, Sogawa C, Inubushi M, Uehara T, Fukumura T, Koizumi M, Arano Y, Saga T. Development of positron emission tomography probe of 64Cu-labeled anti-C-kit 12A8 Fab to measure protooncogene C-kit expression. Nucl Med Biol 2010; 38:331-7. [PMID: 21492781 DOI: 10.1016/j.nucmedbio.2010.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 09/02/2010] [Accepted: 10/12/2010] [Indexed: 12/25/2022]
Abstract
INTRODUCTION C-kit is an important diagnostic and therapeutic target molecule for several malignancies, and c-kit-targeted drugs have been used clinically. Because abundant c-kit expression in tumors is a prerequisite for successful c-kit-targeted therapy, imaging of c-kit expression is expected to play a pivotal role in the therapeutic decision for each patient. We evaluated (64)Cu-labeled Fab of anti-c-kit antibody 12A8 as a positron emission tomography (PET) imaging probe. METHODS (111)In- or (125)I-Labeled 12A8 Fab was evaluated in vitro by cell binding, competitive inhibition and cellular internalization assays, and in vivo by biodistribution in mice bearing c-kit-expressing and -non-expressing tumors. Next, Fab fragment was labeled with the positron emitter (64)Cu and evaluated by PET. RESULTS Radiolabeled 12A8 Fab showed specific binding to c-kit-expressing cells with high affinity and internalized into cells after binding to c-kit on cell surface. Although tumor accumulation of [(111)In]Fab was lower than that of [(111)In]IgG, the faster blood clearance of [(111)In]Fab provided higher tumor-to-blood ratio at 6 h postinjection onwards. Blood clearance of (64)Cu-labeled 12A8 Fab was slower than that of [(111)In]Fab, but PET using [(64)Cu]Fab clearly visualized the tumor at 6 h postinjection onwards. CONCLUSION The (64)Cu-labeled 12A8 Fab could be used for c-kit-specific PET imaging and might help in selecting appropriate patients for c-kit-targeted treatments.
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Affiliation(s)
- Chisato Yoshida
- Diagnostic Imaging Group, Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba 263-8555, Japan
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Yui J, Hatori A, Kawamura K, Yanamoto K, Yamasaki T, Ogawa M, Yoshida Y, Kumata K, Fujinaga M, Nengaki N, Fukumura T, Suzuki K, Zhang MR. Visualization of early infarction in rat brain after ischemia using a translocator protein (18 kDa) PET ligand [11C]DAC with ultra-high specific activity. Neuroimage 2010; 54:123-30. [PMID: 20705143 DOI: 10.1016/j.neuroimage.2010.08.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 07/23/2010] [Accepted: 08/04/2010] [Indexed: 10/19/2022] Open
Abstract
The aim of this study was to visualize early infarction in the rat brain after ischemia using a translocator protein (TSPO) (18 kDa) PET ligand [(11)C]DAC with ultra-high specific activity (SA) of 3670-4450 GBq/μmol. An infarction model of rat brain was prepared by ischemic surgery and evaluated 2 days after ischemia using small-animal PET and in vitro autoradiography. Early infarction with a small increase of TSPO expression in the brain was visualized using PET with high SA [(11)C]DAC (average 4060 GBq/μmol), but was not distinguished clearly with usually reported SA [(11)C]DAC (37 GBq/μmol). Infarction in the rat brain 4 days after ischemia was visualized using high and usually reported SAs [(11)C]DAC. Displacement experiments with unlabeled TSPO-selective AC-5216 or PK11195 diminished the difference in radioactivity between ipsilateral and contralateral sides, confirming that the increased uptake on the infracted brain was specific to TSPO. In vitro autoradiography with high SA [(11)C]DAC showed that the TSPO expression increased on early infarction in the rat brain. High SA [(11)C]DAC is a useful and sensitive biomarker for the visualization of early infarction and the characterization of TSPO expression which was slightly elevated in the infarcted brain using PET.
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Affiliation(s)
- Joji Yui
- Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan
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