CC BY 4.0 · Pharmaceutical Fronts 2020; 02(01): e64-e76
DOI: 10.1055/s-0040-1708527
Original Article
Georg Thieme Verlag KG Stuttgart · New York

Construction of Novel Bispecific Single-Domain Antibodies (BiSdAbs) with Potent Antiangiogenic Activities

Xianglei Liu
1   Engineering Research Center of Cell & Therapeutic Antibody, Ministry of Education, School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
,
Tianyuan Sun
1   Engineering Research Center of Cell & Therapeutic Antibody, Ministry of Education, School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
,
Qiuhan Ge
1   Engineering Research Center of Cell & Therapeutic Antibody, Ministry of Education, School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
,
Jianwei Zhu
1   Engineering Research Center of Cell & Therapeutic Antibody, Ministry of Education, School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
2   Jecho Laboratories, Inc. Maryland, United States
3   Jecho Biopharmaceuticals Co., Ltd., Tianjin, China
› Author Affiliations
Funding This work was supported by the China Postdoctoral Science Foundation (2016M600319) and Natural Science Foundation of China (81473127&81773621).
Further Information

Publication History

Publication Date:
31 March 2020 (online)

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Abstract

The development of bispecific antibodies (BsAbs) has had a profound impact on cancer immunotherapy. Single-domain antibodies (SdAbs) could offer advantages over other antibody formats for the generation of a BsAbs, such as small size (∼12–15 kDa), with high affinity and specificity, superior accessibility, and high yield expression in bacteria. In this study, VEGFR2 and CD16 were chosen as the targets to construct BsAbs. As the rationale, VEGFR2 is critical for tumor-associated angiogenesis, and CD16 expressed on natural killer cells is an important target on immune cells. Humanized anti-VEGFR2 SdAb 3VGR19 and anti-CD16 SdAb C21 were combined to construct several bispecific SdAbs (BiSdAbs). The biochemical properties of the BiSdAbs were characterized. They retained the high affinity for both targets, binding selectivity, and antiangiogenic activity such as inhibition of cell proliferation, migration, endothelial tube formation, angiogenesis, and cytotoxicity to cancer cells in vitro, indicating that BiSdAbs could be a potential alternative for cancer therapy.

Author Contributions

X.L. designed and conducted the experiments, analyzed the data, and drafted the manuscript; T.S. and Q. G. performed some of the experiments. J.Z. supervised project, analyzed data, critically discussed, and revised the manuscript. All authors read and approved the final manuscript.


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