Recombinant Human Monoclonal IgA Antibody Against CEA to Recruit Neutrophils to CEA-Expressing Cells

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IgA is able to trigger antibody-dependent cellular cytotoxicity (ADCC) by recruiting neutrophils expressing the Fc receptor for the CHα chain. We herein describe the preparation of a human recombinant anti-CEA IgA antibody to kill carcinoembryonic antigen (CEA)-expressing tumor cells via ADCC by neutrophils. A single chain Fv (scFv) gene was constructed using a cDNA library of a hybridoma clone that produces a human anti-CEA monoclonal IgG4 (C2-45). The scFv gene, linked with a CHα gene, was inserted into the pBK283 vector, which was cotransfected into BmN4 insect cells with the wild-virus BmNPV. After cloning and amplification, the recombinated virus was injected into silkworm larvae. The resulting human recombinant IgA, designated as 45scFvLCHα, was purified from hemolymph by Ni-affinity chromatography and characterized by ELISA, Western blotting, and the ADCC assay. 45scFvLCHα with an IgA antigenicity was bound to CEA and showed effective killing of the CEA-expressing cells in the presence of IFN--activated neutrophils. These data suggest the recombinant anti-CEA IgA antibody recruiting neutrophils maybe a useful means for the antibody-based immunotherapy of human CEA-expressing tumors.
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  • Formerly: Oncology Research Incorporating Anti-Cancer Drug Design
    Oncology Research Featuring Preclinical and Clincal Cancer Therapeutics publishes research of the highest quality that contributes to an understanding of cancer in areas of molecular biology, cell biology, biochemistry, biophysics, genetics, biology, endocrinology, and immunology, as well as studies on the mechanism of action of carcinogens and therapeutic agents, reports dealing with cancer prevention and epidemiology, and clinical trials delineating effective new therapeutic regimens.
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