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Higashi K, Maeda K, Miyata K, Yoshimura S, Yamada K, Konno D, Tachibana T, Saito K. Carbohydrate 3′-sialyllactose as a novel target for theranostics in pancreatic ductal adenocarcinoma. Tumour Biol 2020. [DOI: 10.1177/1010428320965279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We previously demonstrated that the carbohydrate 3′-sialyllactose is overexpressed in cancer stem-like cells such as metastatic pancreatic and poorly differentiated gastric cancer cells, and undifferentiated human embryonic stem cells. In this study, we investigated the possibility of 3′-sialyllactose as a target for theranostics in cancers using a recombinant mouse monoclonal antibody r3B1E2 that binds to 3′-sialyllactose. Immunohistochemistry analysis confirmed an elevated expression of 3′-sialyllactose in tumors of pancreas, stomach, and testis, while no expression of 3′-sialyllactose was observed in corresponding normal controls. In addition, a stage-independent expression of 3′-sialyllactose was observed, especially in pancreatic ductal adenocarcinoma (PDAC). The level of serum 3′-sialyllactose in PDAC subjects was significantly higher than that in healthy controls, providing excellent AUC of 0.88. We next explored the therapeutic potential of r3B1E2 for PDAC in vitro. Treatment of r3B1E2 with 3′-sialyllactose-bearing human PDAC cells exhibited a complement-dependent cytotoxicity, whereas no significant activity of r3B1E2 against 3′-sialyllactose-negative cells was observed. Collectively, these findings raise the possibility of 3′-sialyllactose as a novel target for theranostics in PDAC.
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Affiliation(s)
- Kiyoshi Higashi
- Advanced Materials Development Laboratory, Sumitomo Chemical Co., Ltd., Osaka, Japan
| | - Keiko Maeda
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., Osaka, Japan
| | - Kaori Miyata
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., Osaka, Japan
| | | | - Keita Yamada
- Laboratory of Toxicology, Faculty of Pharmacy, Osaka Ohtani University, Osaka, Japan
| | - Daijiro Konno
- Cell Engineering Corporation, Osaka, Japan
- Division of Pathophysiology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Taro Tachibana
- Cell Engineering Corporation, Osaka, Japan
- Department of Bioengineering, Graduate School of Engineering, Osaka City University, Osaka, Japan
| | - Koichi Saito
- Advanced Materials Development Laboratory, Sumitomo Chemical Co., Ltd., Osaka, Japan
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