Abstract
VEGF and its receptors, especially VEGFR2 (KDR), are known to play a critical role in angiogenesis under both physiological and pathological conditions, including cancer and angiogenic retinopathies. This study was aimed at developing a fully human IgG1 antibody (mAb-04) constructed from a phage-derived scFv, targeting the VEGF/VEGFR2 pathway. Firstly, an innovative transfection system, containing two recombinant expression vectors (pMH3 and pCApuro), were introduced into CHO-s cells and clones with higher yield selected accordingly. After an optimal fermentation condition was determined, fed-batch fermentation was performed in 5-L bioreactor with a final yield up to 60 mg/L. Further, cell proliferation, wound healing, transwell invasion, tube formation and chick embryo chorioallantoic membrane assays showed significant anti-angiogenic activity of mAb-04 in vitro and in vivo. In addition, the results of Western blotting indicated the ability of mAb-04 to inhibit VEGF-induced VEGFR2 signaling pathway. Finally, ADCC assay demonstrated that mAb-04 is capable of mediating tumor cell killing in presence of effector cells. This study has therefore proved that the full-length antibody targeting human VEGFR2 has potential clinical applications in the treatment of cancer and other diseases where pathological angiogenesis is involved.
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Abbreviations
- ADCC:
-
Antibody-dependent cellular cytotoxicity
- bFGF:
-
Basic fibroblast growth factor
- CAM:
-
Chick embryo chorioallantoic membrane
- ECGS:
-
Endothelial cell growth supplement
- ECM:
-
Endothelial culture medium
- FBS:
-
Fetal bovine serum
- HAMA:
-
Human anti-mouse antibody
- KDR:
-
Kinase insert domain-containing receptor
- KDR3:
-
The extracellular domain 3 of human VEGFR2
- LDH:
-
Lactate dehydragenase
- scFv:
-
Single-chain antibody fragment
- VEGF:
-
Vascular endothelial growth factor
- VEGFR2:
-
Vascular endothelial growth factor receptor 2
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Acknowledgments
This project was supported by the National Natural Science Foundation of China (NSFC81072561, NSFC81102364 and NSFC81273425). The Project Program of State Key Laboratory of Natural Medicines (China Pharmaceutical University, JKGP201101). Jiangsu Province Qinglan Project (2010). A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions. Graduate Student Innovation Project Funded by Huahai Pharmaceutical Co. (CX13S-009HH). Revision by Professor Sherie L. Morrison.
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The authors Wei Xie and Daojuan Li contributed equally to this work.
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Xie, W., Li, D., Zhang, J. et al. Generation and characterization of a novel human IgG1 antibody against vascular endothelial growth factor receptor 2. Cancer Immunol Immunother 63, 877–888 (2014). https://doi.org/10.1007/s00262-014-1560-9
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DOI: https://doi.org/10.1007/s00262-014-1560-9