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Takashima H, Ohnuki K, Manabe S, Koga Y, Tsumura R, Anzai T, Wang Y, Yin X, Sato N, Shigekawa Y, Nambu A, Usuda S, Haba H, Fujii H, Yasunaga M. Tumor Targeting of 211At-Labeled Antibody under Sodium Ascorbate Protection against Radiolysis. Mol Pharm 2022; 20:1156-1167. [PMID: 36573995 PMCID: PMC9906747 DOI: 10.1021/acs.molpharmaceut.2c00869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Astatine-211 (211At) is an alpha emitter applicable to radioimmunotherapy (RIT), a cancer treatment that utilizes radioactive antibodies to target tumors. In the preparation of 211At-labeled monoclonal antibodies (211At-mAbs), the possibility of radionuclide-induced antibody denaturation (radiolysis) is of concern. Our previous study showed that this 211At-induced radiochemical reaction disrupts the cellular binding activity of an astatinated mAb, resulting in attenuation of in vivo antitumor effects, whereas sodium ascorbate (SA), a free radical scavenger, prevents antibody denaturation, contributing to the maintenance of binding and antitumor activity. However, the influence of antibody denaturation on the pharmacokinetics of 211At-mAbs relating to tumor accumulation, blood circulation time, and distribution to normal organs remains unclear. In this study, we use a radioactive anti-human epidermal growth factor receptor 2 (anti-HER2) mAb to demonstrate that an 211At-induced radiochemical reaction disrupts active targeting via an antigen-antibody interaction, whereas SA helps to maintain targeting. In contrast, there was no difference in blood circulation time as well as distribution to normal organs between the stabilized and denatured immunoconjugates, indicating that antibody denaturation may not affect tumor accumulation via passive targeting based on the enhanced permeability and retention effect. In a high-HER2-expressing xenograft model treated with 1 MBq of 211At-anti-HER2 mAbs, SA-dependent maintenance of active targeting contributed to a significantly better response. In treatment with 0.5 or 0.2 MBq, the stabilized radioactive mAb significantly reduced tumor growth compared to the denatured immunoconjugate. Additionally, through a comparison between a stabilized 211At-anti-HER2 mAb and radioactive nontargeted control mAb, we demonstrate that active targeting significantly enhances tumor accumulation of radioactivity and in vivo antitumor effect. In RIT with 211At, active targeting contributes to efficient tumor accumulation of radioactivity, resulting in a potent antitumor effect. SA-dependent protection that successfully maintains tumor targeting will facilitate the clinical application of alpha-RIT.
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Affiliation(s)
- Hiroki Takashima
- Division
of Developmental Therapeutics, Exploratory
Oncology Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Kazunobu Ohnuki
- Division
of Functional Imaging, Exploratory Oncology
Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Shino Manabe
- Laboratory
of Functional Molecule Chemistry, Pharmaceutical Department and Institute
of Medicinal Chemistry, Hoshi University, 2-4-41 Ebara, Shinagawa-ku, Tokyo 142-8501, Japan,Research
Center for Pharmaceutical Development, Graduate School of Pharmaceutical
Sciences & Faculty of Pharmaceutical Sciences, Tohoku University, 6-3
Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan,Glycometabolic
Biochemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yoshikatsu Koga
- Division
of Developmental Therapeutics, Exploratory
Oncology Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan,Department
of Strategic Programs, Exploratory Oncology
Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Ryo Tsumura
- Division
of Developmental Therapeutics, Exploratory
Oncology Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Takahiro Anzai
- Division
of Developmental Therapeutics, Exploratory
Oncology Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Yang Wang
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Xiaojie Yin
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Nozomi Sato
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yudai Shigekawa
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Akihiro Nambu
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Sachiko Usuda
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hiromitsu Haba
- Nishina
Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hirofumi Fujii
- Division
of Functional Imaging, Exploratory Oncology
Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Masahiro Yasunaga
- Division
of Developmental Therapeutics, Exploratory
Oncology Research & Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan,Tel.: +81-4-7134-6857. Fax: +81-4-7134-6866.
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Takashima H, Koga Y, Manabe S, Ohnuki K, Tsumura R, Anzai T, Iwata N, Wang Y, Yokokita T, Komori Y, Mori D, Usuda S, Haba H, Fujii H, Matsumura Y, Yasunaga M. Radioimmunotherapy with an 211 At-labeled anti-tissue factor antibody protected by sodium ascorbate. Cancer Sci 2021; 112:1975-1986. [PMID: 33606344 PMCID: PMC8088967 DOI: 10.1111/cas.14857] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/03/2021] [Accepted: 02/14/2021] [Indexed: 02/06/2023] Open
Abstract
Tissue factor (TF), the trigger protein of the extrinsic blood coagulation cascade, is abundantly expressed in various cancers including gastric cancer. Anti-TF monoclonal antibodies (mAbs) capable of targeting cancers have been successfully applied to armed antibodies such as antibody-drug conjugates (ADCs) and molecular imaging probes. We prepared an anti-TF mAb, clone 1084, labeled with astatine-211 (211 At), as a promising alpha emitter for cancer treatment. Alpha particles are characterized by high linear energy transfer and a range of 50-100 µm in tissue. Therefore, selective and efficient tumor accumulation of alpha emitters results in potent antitumor activities against cancer cells with minor effects on normal cells adjacent to the tumor. Although the 211 At-conjugated clone 1084 (211 At-anti-TF mAb) was disrupted by an 211 At-induced radiochemical reaction, we demonstrated that astatinated anti-TF mAbs eluted in 0.6% or 1.2% sodium ascorbate (SA) solution were protected from antibody denaturation, which contributed to the maintenance of cellular binding activities and cytocidal effects of this immunoconjugate. Although body weight loss was observed in mice administered a 1.2% SA solution, the loss was transient and the radioprotectant seemed to be tolerable in vivo. In a high TF-expressing gastric cancer xenograft model, 211 At-anti-TF mAb in 1.2% SA exerted a significantly greater antitumor effect than nonprotected 211 At-anti-TF mAb. Moreover, the antitumor activities of the protected immunoconjugate in gastric cancer xenograft models were dependent on the level of TF in cancer cells. These findings suggest the clinical availability of the radioprotectant and applicability of clone 1084 to 211 At-radioimmunotherapy.
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Affiliation(s)
- Hiroki Takashima
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Yoshikatsu Koga
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan.,Department of Strategic Programs, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Shino Manabe
- Laboratory of Functional Molecule Chemistry, Pharmaceutical Department and Institute of Medicinal Chemistry, Hoshi University, Tokyo, Japan.,Research Center for Pharmaceutical Development, Graduate School of Pharmaceutical Sciences & Faculty of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.,Glycometabolic Biochemistry Laboratory, RIKEN, Wako, Japan
| | - Kazunobu Ohnuki
- Division of Functional Imaging, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Ryo Tsumura
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Takahiro Anzai
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Nozomi Iwata
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Yang Wang
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Takuya Yokokita
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Yukiko Komori
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Daiki Mori
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Sachiko Usuda
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Hiromitsu Haba
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Japan
| | - Hirofumi Fujii
- Division of Functional Imaging, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Yasuhiro Matsumura
- Department of Immune Medicine, National Cancer Center Research Institute, National Cancer Center, Chuo-ku, Tokyo, Japan
| | - Masahiro Yasunaga
- Division of Developmental Therapeutics, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan
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