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Takakusagi Y, Sugyo A, Tsuji AB, Sudo H, Yasunaga M, Matsumura Y, Sugawara F, Sakaguchi K, Higashi T. The natural sulfoglycolipid derivative SQAP improves the therapeutic efficacy of tissue factor-targeted radioimmunotherapy in the stroma-rich pancreatic cancer model BxPC-3. Transl Oncol 2021; 15:101285. [PMID: 34839108 PMCID: PMC8628266 DOI: 10.1016/j.tranon.2021.101285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 10/31/2021] [Accepted: 11/15/2021] [Indexed: 02/07/2023] Open
Abstract
SQAP enhanced tumor uptake and the therapeutic efficacy of radiolabeled anti-tissue factor antibody 1849. SQAP allows for a reduction of the dose of the therapeutic agent 90Y-labeled 1849 to half. SQAP did not affect hematologic parameters, or gastrointestinal and respiratory systems in mice. 90Y-labeled 1849 with SQAP potentially increases exposure of tumors to radiation.
α-Sulfoquinovosylacyl-1,3-propanediol (SQAP) is a semi-synthetic derivative of natural sulfoglycolipid that sensitizes tumors to external-beam radiotherapy. How SQAP affects internal radiotherapy, however, is not known. Here, we investigated the effects of SQAP for radioimmunotherapy (RIT) targeting tissue factor (TF) in a stroma-rich refractory pancreatic cancer mouse model, BxPC-3. A low dose of SQAP (2 mg/kg) increased tumor uptake of the 111In-labeled anti-TF antibody 1849, indicating increased tumor perfusion. The addition of SQAP enhanced the growth-inhibitory effect of 90Y-labeled 1849 without leading to severe body weight changes, allowing for the dose of 90Y-labeled 1849 to be reduced to half that when used alone. Histologic analysis revealed few necrotic and apoptotic cells, but Ki-67–positive proliferating cells and increased vascular formation were detected. These results suggest that the addition of a low dose of SQAP may improve the therapeutic efficacy of TF-targeted RIT by increasing tumor perfusion, even for stroma-rich refractory pancreatic cancer.
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Affiliation(s)
- Yoichi Takakusagi
- Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQMS), 4-9-1 Inage, Chiba 263-8555, Japan; Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQLS), 4-9-1 Inage, Chiba 263-8555, Japan
| | - Aya Sugyo
- Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQMS), 4-9-1 Inage, Chiba 263-8555, Japan
| | - Atsushi B Tsuji
- Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQMS), 4-9-1 Inage, Chiba 263-8555, Japan.
| | - Hitomi Sudo
- Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQMS), 4-9-1 Inage, Chiba 263-8555, Japan
| | - Masahiro Yasunaga
- Division of Developmental Therapeutics, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Yasuhiro Matsumura
- Department of Immune Medicine, National Cancer Center Research Institute 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Fumio Sugawara
- pplied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan; Malignant Tumor Treatment Technologies (M.T.3) Inc., 3-20-2 Shibaura, Minato-ku, Tokyo 108-0023, Japan
| | - Kengo Sakaguchi
- pplied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan; Malignant Tumor Treatment Technologies (M.T.3) Inc., 3-20-2 Shibaura, Minato-ku, Tokyo 108-0023, Japan
| | - Tatsuya Higashi
- Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, National Institutes for Quantum and Radiological Science and Technology (QST-iQMS), 4-9-1 Inage, Chiba 263-8555, Japan
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