Abstract
The tumor-associated glycoprotein 72 (TAG-72) is a membrane mucin whose over-expression is correlated with advanced tumor stage and increased invasion and metastasis. In this study, we identified a panel of four nanobodies, single variable domains of dromedary heavy-chain antibodies that specifically recognize the TAG-72 antigen. All selected nanobodies were shown to selectively bind to this cancer-related molecule with low-nanomolar affinities and do not cross-react with other antigens, such as MUC1 or HER2. Furthermore, they can detect TAG-72 in concentrations as low as 5 U/ml which is valuable in sensitive detection of this molecule in cancerous patients. Cell ELISA experiments proved their ability for binding to the native target antigen on TAG-72 expressing cells while not showing any reactivity to HT-29 cells, a TAG-72-negative cell line. Using competition studies, we found that each nanobody recognizes a distinct epitope on the TAG-72 antigen that is different from the one recognized by the mouse anti-TAG-72 antibody, CC49. Considering their high specificity, reduced immunogenicity and multi-targeting behavior, these oligoclonal nanobodies represent a promising tool to target TAG-72 over-expressing tumor cells.
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Abbreviations
- CDR:
-
Complementari determining region
- Fab:
-
Fragment antigen binding
- FR:
-
Framework region
- HAMA:
-
Human anti-mouse antibody
- IPTG:
-
Isopropyl-β-d-thiogalactopyranoside
- scFv:
-
Single chain variable fragment
- mAb:
-
Monoclonal antibody
- TAG-72:
-
Tumor-associated glycoprotein 72
- TMB:
-
Tetramethylbenzidine
- VHH:
-
Variable heavy-chain domain of heavy-chain antibody
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Acknowledgments
We are grateful to Dr. Oliver Jay Broom (KIPA—Krahbichler Intellectual Property Advisors AB, 251 10 Helsingborg, Sweden) and Dr. Ladan Parhamifar (Center of Pharmaceutical Nanotechnology and Nanotoxicology, Department of Pharmaceutics and Analytical Chemistry, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark) for their critical language revision of the manuscript. This study was supported by Pasteur Institute of Iran, Tehran, Iran and the Biotechnology committee of Tarbiat Modares University (TMU-88-8-67), Tehran, Iran.
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Sharifzadeh, Z., Rahbarizadeh, F., Shokrgozar, M.A. et al. Development of Oligoclonal Nanobodies for Targeting the Tumor-Associated Glycoprotein 72 Antigen. Mol Biotechnol 54, 590–601 (2013). https://doi.org/10.1007/s12033-012-9601-0
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DOI: https://doi.org/10.1007/s12033-012-9601-0