Abstract
A simple technique to enhance the humoral immune response to intracellular protein antigens in genetic immunizations is demonstrated in mice. In this approach, the intracellular protein is intentionally secreted from expressing cells as a chimeric protein, comprising an N-terminal secreted protein fused to the intracellular protein antigen. Using the Leishmania chagasi Ldccys1 cysteine protease (411CP) as an example of an intracellular protein antigen and both human and murine granulocyte colony stimulating factor (GMCSF) as examples of N-terminal secretion competent fusion partners in chimeric proteins, a humoral response in plasmid DNA immunized mice could only be detected by Western blotting when the expressed 411CP was secreted.
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