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Radiosynthesis and evaluation of acetamidobenzoxazolone based radioligand [11C]N′-MPB for visualization of 18 kDa TSPO in brain
https://repo.qst.go.jp/records/80106
https://repo.qst.go.jp/records/801060be4fd9b-f3b7-4532-a14d-7fc9afcc0dd4
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-06-22 | |||||
| タイトル | ||||||
| タイトル | Radiosynthesis and evaluation of acetamidobenzoxazolone based radioligand [11C]N′-MPB for visualization of 18 kDa TSPO in brain | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Tiwari, Anjani
× Tiwari, Anjani× Zhang, Yiding× Yamasaki, Tomoteru× Kumari, Neelam× Fujinaga, Masayuki× Mori, Wakana× Hatori, Akiko× Nengaki, Nobuki× Kumar Mishra, Anil× Zhang, Hong× Ming-Rong, Zhang× Tiwari, Anjani× Zhang, Yiding× Yamasaki, Tomoteru× Fujinaga, Masayuki× Mori, Wakana× Hatori, Akiko× Nengaki, Nobuki× Ming-Rong, Zhang |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The 18 kDa translocator protein (TSPO) is a viable target for imaging of inflammation in brain. In the recent past we have explored a pharmacophore skeleton acetamidobenzoxazolone for positron emission tomography (PET) imaging of TSPO expression in brain. Here we evaluated a new radioligand for visualization of TSPO, namely [11C]N-(2-methoxyoxyphenyl)-N-methyl-2-(5-nitro-2-oxobenzo[d]oxazol-3(2H)-yl)acetamide ([11C]N′-MPB). This PET ligand exhibited high binding affinity towards TSPO (Ki = 4.9 nM) and a suitable lipophilicity (log D) of 2.08 for brain imaging. A biodistribution study on mice showed high accumulation of radioactivity in TSPO-rich organs, such as the lungs, heart, kidneys, and adrenal glands. Metabolite analysis of rat brain homogenate showed 98% intact [11C]N′-MPB at 30 min after injection. To determine the specific binding of the radioligand with TSPO on neuroinflammation of the brain, in vitro autoradiography and PET studies were performed in an ischemic rat model. In vitro autoradiography indicated significantly increased binding on the ipsilateral side compared with that on the contralateral side of ischemic rat brains. This result was supported firmly by the contrast of radioactivity in PET images. Displacement experiments with PK11195 minimized the difference in radioactivity uptake between the two sides. In summary, [11C]N′-MPB is a potential PET imaging radioligand for TSPO and, consequently, for gaining more insight for up-regulation of microglia during neuroinflammation. | |||||
| 書誌情報 |
NJC (New Journal of Chemistry) 巻 44, p. 7912-7922, 発行日 2020-03 |
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| 出版者 | ||||||
| 出版者 | Royal Society of Chemistry | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1144-0546 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1039/d0nj00509f | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://pubs.rsc.org/en/Content/ArticleLanding/2020/NJ/D0NJ00509F#!divAbstract | |||||
