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Development of podoplanin-targeted alpha-radioimmunotherapy and highly accurate dose evaluation method for complete recovery of malignant mesothelioma

Research Project

Project/Area Number 21K07688
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionNational Institutes for Quantum Science and Technology

Principal Investigator

Sudo Hitomi  国立研究開発法人量子科学技術研究開発機構, 量子医科学研究所 分子イメージング診断治療研究部, 主任研究員 (10415416)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords放射免疫療法 / ポドプラニン / 中皮腫 / アクチニウム225 / α線
Outline of Research at the Start

放射免疫療法は、癌細胞に高発現している抗原に対する抗体に治療用のラジオアイソトープを標識し、体内に投与する放射線治療法である。これまでにがんで発現しているポドプラニンを特異的に認識する抗体を用い、β線治療核種Y-90による放射免疫療法の効果について、腫瘍モデル動物において重篤な副作用なしに高い治療効果が得られたことを報告した。本研究では、β線よりも高い細胞障害性をもつα線を放出する核種であるAc-225で抗ポドプラニン抗体を標識し、その治療効果や副作用をマウスモデルを用いて評価し、Ac-225標識ポドプラニン抗体の放射免疫療法の臨床応用に向けた根拠を示す。

Outline of Final Research Achievements

Using a subcutaneous tumor model, we have demonstrated that radioimmunotherapy (RIT) with RI-labeled antibodies that specifically recognize podoplanin, which is highly expressed in mesothelioma, is a promising treatment for mesothelioma. In this study, we estimated the absorbed doses in tumors and organs and evaluated the therapeutic effect and side effects of 225Ac-labeled antibodies using an orthotopic mesothelioma model. Administration of 225Ac-labeled antibody via tail vein showed high therapeutic effect, but the absorbed doses in lungs and bone marrow were estimated higher than those of subcutaneous tumor model. Administration of labeled antibody into thoracic cavity suppressed the absorbed doses in lung and bone marrow and showed high therapeutic effect similarly iv injection. These results suggest that pleural administration of 225Ac-labeled anti-podoplanin antibodies is a promising treatment.

Academic Significance and Societal Importance of the Research Achievements

α線放出核種である225Ac標識した抗ポドプラニン抗体が90Y標識した抗ポドプラニン抗体に比べ、より高い治療効果を持つことが示され、α線放出核種を用いたRIT(α-RIT)が中皮腫に対する有望な治療法になることが示唆された。
また、ポドプラニンは脳腫瘍など様々ながんで高発現していることが報告されており、本抗体を用いたα-RITが中皮腫以外の固形がんの治療法の開発に大きな進展をもたらすことが期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

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

  • [Journal Article] Head‐to‐head comparison of three chelates reveals DOTAGA promising for <sup>225</sup>Ac labeling of anti‐FZD10 antibody OTSA1012023

    • Author(s)
      Sudo Hitomi、Tsuji Atsushi B.、Sugyo Aya、Harada Yosuke、Nagayama Satoshi、Katagiri Toyomasa、Nakamura Yusuke、Higashi Tatsuya
    • Journal Title

      Cancer Science

      Volume: 114 Issue: 12 Pages: 4677-4690

    • DOI

      10.1111/cas.15978

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Preclinical evaluation of podoplanin-targeted al-pha-radioimmunotherapy with the novel antibody NZ-16 for malignant mesothelioma2021

    • Author(s)
      Asano T, Suzuki H, Kaneko MK, Kato Y.
    • Journal Title

      Cells

      Volume: 10 Issue: 10 Pages: 2503-2503

    • DOI

      10.3390/cells10102503

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] FZD10-targeted α-radioimmunotherapy with 225 Ac-labeled OTSA101 achieves complete remission in a synovial sarcoma model2021

    • Author(s)
      Sudo H, Tsuji AB, Sugyo A, Harada Y, Nagayama S, Katagiri T, Nakamura Y, Higashi T.
    • Journal Title

      Cancer Sci.

      Volume: 113 Issue: 2 Pages: 721-732

    • DOI

      10.1111/cas.15235

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Comparison of administration routes of the radiolabeled anti-PDPN antibody NZ-16 in radioimmunotherapy for mesothelioma2023

    • Author(s)
      須藤仁美
    • Organizer
      第82回日本癌学会学術総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] α-Radioimmunotherapy with 225Ac-labeled anti-FZD10 antibody achieves complete response in a synovial sarcoma model2022

    • Author(s)
      須藤仁美
    • Organizer
      第81回日本癌学会学術総会
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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