| 摘要 |
ENOX2 proteins are growth-related cell surface proteins expressed specifically by cancer cells; they catalyze NADH oxidation and protein disulfide-thiol interchange reactions. Taught herein are IgM class autoantibodies specific to ENOX2 (tNOX) in a variety of cancer patient sera. Early cancer patients produce these autoantibodies as a possible defense mechanism. Because ENOX2 is bound to autoantibodies in patients, it is unavailable to bind conventional ENOX2-specific antibodies in standard ELISA assays, but two-dimensional gel electrophoresis dissociates ENOX2 protein from autoantibodies, allowing detection. Probing ENOX2 using cancer sera as a source of ENOX2 autoantibodies followed by horseradish peroxidase-coupled anti-human IgM allows visualization and detection of the ENOX2 autoantibody. ENOX2 autoantibodies from breast cancer sera reacts with the ENOX2 isoforms from, e.g., lung and ovarian cancer patient sera. ENOX2 autoantibodies enable cancer screening based both on autoantibody detection and autoantibody dissociation to allow for standard ELISA development as well as therapy.
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