Potential of pre-labeling method for preparation of radiolabeled antibody

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K16784
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 52040:Radiological sciences-related
• Research Institution: Gunma University
• Principal Investigator: Kanai Ayaka 群馬大学, 大学院医学系研究科, 寄附講座等教員 (10847495)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: RI標識抗体 / キレート試薬 / 放射性医薬品

Outline of Final Research Achievements

In this study, we designed and synthesized novel chelating compounds based on the pre-labeling method and investigated their usefulness for the development of reagents that can easily radiolabel unmodified antibodies.The pre-labeling method using a new compound enables labeling by simply mixing various unmodified antibodies, and furthermore, antibodies radiolabeled with a new chelating reagent showed comparable stability, cell binding, and pharmacokinetics in mice compared to antibodies labeled by conventional methods.
In conclusion, this new chelating compound, which was designed based on the pre-labeling method, enables efficient radiolabeling without impairing the properties of the antibody, compared to the conventional method.

Free Research Field

核医学

Academic Significance and Societal Importance of the Research Achievements

本研究成果により任意の未修飾な抗体を簡便に金属核種標識することが可能なキレートkit薬剤が開発された。抗体は核医学分野においても重要な標的指向性分子の１つであり、本新規キレート薬剤の開発は抗体標識の効率化を達成し、抗体医薬品開発のさらなる発展に寄与するものである。