| 研究課題/領域番号 |
23K24288
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| 補助金の研究課題番号 |
22H03027 (2022-2023)
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| 研究種目 |
基盤研究(B)
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| 配分区分 | 基金 (2024)
補助金 (2022-2023) |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分52040:放射線科学関連
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| 研究機関 | 岡山大学 |
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研究代表者 |
樋口 隆弘 岡山大学, 医歯薬学域, 教授 (30739850)
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| 研究期間 (年度) |
2022-04-01 – 2026-03-31
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| 研究課題ステータス |
交付 (2024年度)
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| 配分額 *注記 |
17,290千円 (直接経費: 13,300千円、間接経費: 3,990千円)
2025年度: 4,160千円 (直接経費: 3,200千円、間接経費: 960千円)
2024年度: 4,420千円 (直接経費: 3,400千円、間接経費: 1,020千円)
2023年度: 4,030千円 (直接経費: 3,100千円、間接経費: 930千円)
2022年度: 4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
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| キーワード | neutrophil / ARDS / CXCR2 / PET imaging / PET / COVID-19 |
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| 研究開始時の研究の概要 |
Massive neutrophil infiltration in the lung alveolus and their surroundings is important for initiation and progression of ARDS. We focus on the CXCR2, expressed on the cell surface of neutrophils, with the goal of developing neutrophil-specific PET imaging that can be applied clinically.
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| 研究実績の概要 |
The goal of this study is to develop a PET imaging assay that can specifically detect neutrophils of the lung and other organs by targeting the CXCR2, a
chemokine receptor specifically expressed on neutrophils.
At present, there is no in vivo imaging technique that can specifically visualize local neutrophil infiltration identified via systemic scanning of human body as well as animals. Therefore, we aim to achieve this by using cutting edge PET molecular imaging technology, which can visualize biomarker molecules with high sensitivity.
Considering future clinical applications, to develop of small molecule tracers for F18-labeling that are easy to handle in clinical settings, we designed and synthesized PET tracer candidates targeting CXCR2 in this year. To evaluate the affinity of these radiotracers, cold references, i.e. their non-radioactive references, were synthesized first. The direct radiofluorination without the special preparation of tosylate precursor was also methodology investigation to facilitate the radiolabelling protocol from original structures. In contract, the cold references of urea series of compounds and the corresponding precursors for radiolabelling were also synthesized.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
We designed and synthesized PET tracer candidates targeting CXCR2. To evaluate the affinity of these radiotracers, cold references, i.e. their non-radioactive references, were synthesized first. The direct radiofluorination without the special preparation of tosylate precursor was also methodology investigation to facilitate the radiolabelling protocol from original structures.
The advantage of using reparixin with direct fluorination is that commercially available one could be used directly to test the labelling protocol. In contract, the cold references of urea series of compounds and the corresponding precursors for radiolabelling were also synthesized.
Since the initial first-year experimental plan has been completed, we believe that the research progress is generally on track.
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| 今後の研究の推進方策 |
In this project, we will develop neutrophil-specific PET imaging of inflammation by 1) targeting CXCR2, a chemokine receptor specifically expressed on neutrophils, 2) using molecular imaging with PET imaging technology that enables highly sensitive molecular detection, 3) designing an 18F-labeled small molecule tracer formulation suitable for clinical application, through evaluation in synthetic, cellular, and animal experiments.
For accomplished this project, we’ll do in vitro assays to test the binding affinity, selectivity, and stability of the compounds. And then, we’ll stablish and optimize radiolabelling methods of the PET tracers. Next step, ex vivo analysis and biodistribution will be done: in vivo evaluation of at least one candidate tracer in a healthy rodent. Finally, we’ll do the longitudinal PET imaging using the rodent animal models of this disease.
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