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Ohashi, T. et al.

Development and characterization of novel monoclonal antibodies against tartrate-resistant Acid phosphatase 5.

Serum band 5 tartrate-resistant acid phosphatase (TRACP 5; EC 3.1.3.2) is a glycoprotein that exists as two very similar isoforms, TRACP 5a and TRACP 5b. The similarity of these two isoforms has made it difficult to establish monoclonal antibodies specific for either isoform. We report here the development of a monoclonal antibody with high specificity for TRACP 5b. We prepared TRACP 5b antigens from four sources: TRACP 5b purified from human bone, recombinant TRACP 5 from Escherichia coli, recombinant TRACP 5 from insect cells, and a synthetic TRACP 5b peptide. Thirty-seven mice were each immunized with 1 of the 4 different TRACP antigens to generate 473 antibody-producing clones. Three of these clones, Trk27, Trk49, and Trk62, reacted with TRACP 5b. These three clones were all established from mice exposed to native bone TRACP 5b antigen. In fact, none of the other antigens were able to generate anti-TRACP 5b monoclonal antibodies in mice. Furthermore, Trk62 interacted more strongly with TRACP 5b than with TRACP 5a. These results suggested that although recombinant proteins can be effective antigens, the native TRACP 5 protein might be more effective at generating monoclonal antibodies of greater specificity due to its more faithful representation of the native three-dimensional structure of the protein.[1]

References

Development and characterization of novel monoclonal antibodies against tartrate-resistant Acid phosphatase 5. Ohashi, T., Miura, T., Igarashi, Y., Kiyokawa, I., Sato, Y., Sasagawa, K., Katagiri, K., Mochizuki, Y., Tomonaga, T., Nomura, F., Kojima, R., Katayama, K. Hybridoma (2005) (2006) [Pubmed]

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