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Noninvasive evaluation of GLP-1 receptor in central nervous system

Research Project

Project/Area Number 21K20931
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0904:Internal medicine of the bio-information integration and related fields
Research InstitutionKyoto University

Principal Investigator

Murakami Takaaki  京都大学, 医学研究科, 助教 (50904017)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords糖尿病 / GLP-1受容体 / イメージング / 分子イメージング / 中枢神経系 / 膵β細胞量
Outline of Research at the Start

本研究では、独自に開発したプローブを用いた非侵襲的評価技術により、生体の膵β細胞量と同時に中枢神経系のGlucagon like-peptide-1受容体(GLP-1R)発現量を可視・定量化し、肥満や糖尿病における、中枢神経系のGLP-1R発現量のもつ意義、及び両者の時相的関係性を明らかにすることを目的にする。Exendin-4を骨格とした放射性同位元素標識プローブを用い、視床下部を中心とした中枢神経系でのGLP-1R発現量を定量し、その生理学的・病的意義を解明する。また、中枢神経系GLP-1R発現量と膵β細胞量変化を同時かつ縦断的に評価できる系を確立する。

Outline of Final Research Achievements

Mice were injected intravenously with 111In-Ex4 probe in the tail and SPECT/CT imaging was performed including the head. Limited significant accumulation was observed in the hypothalamus/pituitary region, which could be visualized at the same time as the pancreas. No significant accumulation was observed in other intracranial regions. The significant accumulation disappeared after pre-treatment with Ex(9-39). Next, the pituitary gland, hypothalamus, cerebrum, and pancreas were collected after administration of the probe, and RI accumulation values were measured with a γ counter. Stable accumulation was observed in the pituitary gland, but not in the hypothalamus or cerebrum. The GLP1-R mRNA expression level in the pituitary gland was significantly correlated with the RI accumulation level, indicating that the pituitary gland was responsible for the accumulation observed on 111In-Ex4 SPECT images.

Academic Significance and Societal Importance of the Research Achievements

中枢神経領域での111In-Ex4プローブ集積像は膵臓と同時に描出できたことから、GLP-1R標的膵・中枢神経同時イメージングが可能であった。また、画像上の解剖学的位置情報や、Biodistribution studyの結果から、同有意集積領域は下垂体へのプローブ集積シグナルであることが明らかになった。また、SPECT画像上の同領域のRI集積値とGLP-1R mRNA発現量は有意な相関関係を示すことから、111In-Ex4 SPECT/CTにより、膵β細胞量同様、下垂体のGLP-1R発現に関する量的情報を非侵襲的に得られる可能性がある。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (3 results)

All 2023 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results)

  • [Journal Article] Noninvasive quantitative evaluation of viable islet grafts using <scp> <sup>111</sup> In </scp> ‐exendin‐4 <scp>SPECT</scp> / <scp>CT</scp>2023

    • Author(s)
      Botagarova Ainur、Murakami Takaaki、Fujimoto Hiroyuki、Fauzi Muhammad、Kiyobayashi Sakura、Otani Daisuke、Fujimoto Nanae、Inagaki Nobuya
    • Journal Title

      The FASEB Journal

      Volume: 37 Issue: 4 Pages: 1-11

    • DOI

      10.1096/fj.202201787rr

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Preservation effect of imeglimin on pancreatic β-cell mass: Noninvasive evaluation using 111In-exendin-4 SPECT/CT imaging and the perspective of mitochondrial involvements2022

    • Author(s)
      Fauzi Muhammad、Murakami Takaaki、Fujimoto Hiroyuki、Botagarova Ainur、Sakaki Kentaro、Kiyobayashi Sakura、Ogura Masahito、Inagaki Nobuya
    • Journal Title

      Frontiers in Endocrinology

      Volume: 13 Pages: 1-12

    • DOI

      10.3389/fendo.2022.1010825

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Noninvasive Evaluation of GIP Effects on β-Cell Mass Under High-Fat Diet2022

    • Author(s)
      Kiyobayashi Sakura、Murakami Takaaki、Harada Norio、Fujimoto Hiroyuki、Murata Yuki、Fujita Naotaka、Hamamatsu Keita、Ikeguchi-Ogura Eri、Hatoko Tomonobu、Lu Xuejing、Yamane Shunsuke、Inagaki Nobuya
    • Journal Title

      Frontiers in Endocrinology

      Volume: 13 Pages: 1-11

    • DOI

      10.3389/fendo.2022.921125

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

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Published: 2021-10-22   Modified: 2024-01-30  

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