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. 2000;9(2):155–159. doi: 10.1023/A:1008987403484

Expression of a functional mouse-human chimeric anti-CD19 antibody in the milk of transgenic mice

Petra van Kuik-Romeijn 1, Nanda de Groot 1, Erik Hooijberg 2, Herman A de Boer 1
PMCID: PMC7089348  PMID: 10951698

Abstract

Human B cell lymphomas are suitable targets for immunotherapy. Clinical trials with mouse-human chimeric B cell-specific monoclonal antibodies (mAbs) have already shown promising results. However, limitations for their use in clinical trials can be the lack of sufficient amounts and high production costs. Expression of mAbs in the mammary gland of transgenic animals provides an economically advantageous possibility for production of sufficient quantities of a promising antibody for clinical trials and beyond. In this paper, we show the feasibility of this approach, by generating transgenic mice expressing mouse-human chimeric anti-CD19 mAbs in their milk. Mouse anti-CD19 variable (V) region genes were combined with human IgG1 heavy (H) and kappa light (L) chain constant (C) region genes and fused to the bovine β-lactoglobulin (BLG) promoter in two separate expression cassettes. Co-injection resulted in five transgenic lines. In one of these lines completely assembled chimeric mAbs were secreted into the milk, at an approximate level of 0.5mg/ml. These mAbs were able to bind specifically to the CD19 surface antigen on human B cells.

Keywords: BLG promoter, chimeric, expression, milk, monoclonal antibody, mouse-human, transgenic mice

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