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BioMed Research International
Volume 2014, Article ID 309307, 11 pages
Research Article

Development and Characterization of New Monoclonal Antibodies against Human Recombinant CA XII

1Institute of Biotechnology, Vilnius University, V. A. Graiciuno 8, 20241 Vilnius, Lithuania
2School of Medicine and Institute of Biomedical Technology, University of Tampere and Fimlab Ltd., Medisiinarinkatu 3, 33520 Tampere, Finland

Received 19 August 2013; Accepted 7 April 2014; Published 20 May 2014

Academic Editor: Nathalie M. Mazure

Copyright © 2014 Dovile Dekaminaviciute et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Carbonic anhydrases (CAs) are enzymes that catalyse the reversible hydration of CO2 to bicarbonate. CA XII is considered a potential biomarker of tumor cells and a promising target for specific therapies. The aim of the current study was to develop new monoclonal antibodies (MAbs) against human recombinant CA XII and evaluate their diagnostic potential. An extracellular catalytic domain of human CA XII was expressed in E. coli and used as an immunogen. Seven stable hybridoma cell lines producing high-affinity IgG antibodies against human CA XII were generated. The majority of MAbs were highly specific to CA XII and did not cross-react with human recombinant CA I, CA II, CA VII, and CA XIII. In order to demonstrate the diagnostic value of the MAbs, they were employed for the immunohistochemistry analysis of CA XII expression in tissues. Two MAbs (15A4 and 4A6) demonstrated a strong and specific immunostaining of CA XII in human tissue specimens. Flow cytometry analysis of 5 human tumor cell lines with the MAb 15A4 revealed its immunoreactivity with cellular CA XII. In conclusion, the MAbs raised against recombinant catalytic domain of CA XII recognize cellular CA XII and represent a promising diagnostic tool for the immunodetection of CA XII-expressing cells.