Production of Novel Anti-Recombinant Human Erythropoietin Monoclonal Antibodies and Development of a Sensitive Enzyme-Linked Immunosorbent Assay for Detection of Bioactive Human Erythropoietin

• Published in: Journal of immunoassay & immunochemistry Vol. 29; no. 2; pp. 181 - 196
• Main Authors: Yanagihara, Shigehiro, Kori, Yuko, Ishikawa, Rika, Kutsukake, Kazuhiro
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis Group 01-01-2008
• Subjects: Animals; Antibodies, Monoclonal - chemistry; Antibodies, Monoclonal - immunology; Antibody Affinity - immunology; Cell Differentiation - drug effects; Cell Differentiation - immunology; Cell-based potency assay; Conformation-dependent epitope; Drug Monitoring; Enzyme-linked immunosorbent assay; Enzyme-Linked Immunosorbent Assay - methods; Epitopes - blood; Epitopes - immunology; Erythroid Precursor Cells - immunology; Erythropoietin - blood; Erythropoietin - immunology; Erythropoietin - pharmacology; Humans; Mice; Mice, Inbred BALB C; Monoclonal antibodies; Protein Structure, Tertiary; Recombinant human erythropoietin; Recombinant Proteins; Structure-Activity Relationship; Validation
• ISSN: 1532-1819; 1532-4230
• DOI: 10.1080/15321810801888506

Erythropoietin (EPO) is a growth factor, regulating the proliferation and differentiation of erythroid progenitor cells. In this study, we generated five monoclonal antibodies (mAbs) that reacted specifically with recombinant human EPO (rhEPO). Epitope exclusion and other experiments showed that the mAbs obtained were divided into two groups, differing in recognition sites for rhEPO: group 1 mAbs recognize the N-terminal region of rhEPO, whereas group 2 mAbs seem to recognize a conformation-dependent epitope. Although most of the previously reported anti-EPO antibodies that recognized the N-terminal region of EPO lacked the EPO-neutralizing activity, the group 1 mAbs obtained here had the rhEPO-neutralizing activity. Therefore, the group 1 mAbs may be useful for future study on structure-function relationship of EPO. One of the group 2 mAbs, 5D11A, showed the highest affinity for rhEPO with K
D
value 0.52 nM and had the highest rhEPO-neutralizing activity. Using this mAb, we developed a reproducible and sensitive enzyme-linked immunosorbent assay for the quantification of bioactive rhEPO.