Abstract
Specific anti-tumor and anti-viral activities can be conferred on lymphocytic and myeloid effector cells by retargeting them with bispecific antibodies. These are antibodies which possess an anti-target binding region and a region capable of binding specific effector cell surface markers. For the rapid evaluation of recombinant human Fabs as bispecific antibodies, we have constructed a vector that allows for the conversion of Fabs into protein A fusion proteins. These can be used to generate bispecific antibodies when complexed to appropriate anti-effector cell immunoglobulins. As a model system, a protein A fusion derivative of a human recombinant anti-herpes simplex virus (HSV) Fab was constructed and complexed to OKT3, a T cell-activating antibody specific for CD3. This complex reduced HSV-2 yields in infected cells by about three logs relative to controls when incubated on HSV-2-infected cell monolayers in the presence of IL-2-actiyated lymphocytes. The system described allows for the rapid evaluation of recombinant human Fabs as bispecific antibodies for therapeutic applications. In addition, Fab-protein A fusion proteins can be used in ELISA and other immuno-assays with increased sensitivity.
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Sanna, P., De Logu, A., Williamson, R. et al. Rapid Assay of Phage-Derived Recombinant Human Fabs As Bispecific Antibodies. Nat Biotechnol 13, 1221–1224 (1995). https://doi.org/10.1038/nbt1195-1221
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DOI: https://doi.org/10.1038/nbt1195-1221