Development of a Multiplex Bead-Based Method for the Microquantitation of δ-Catenin

δ-Catenin is overexpressed in human cancers, including prostate, breast, lung, and ovarian cancers. Therefore, detection of δ-catenin level in patient specimens can be used as a diagnostic marker for the cancer screening. In laboratories, δ-catenin levels have been analyzed by western blot, which requires multiple procedures and is incapable of multiplex analysis of a target protein from a single reaction. In this study, we aimed to develop δ-catenin antibody-conjugated magnetic beads that can be used for quantitation of δ-catenin by bead-based multiplex assay. δ-catenin level from HEK293T and CWR22Rv-1 cell lysates was quantified to determine whether the antibody-conjugatedmagnetic bead can be used for the detection of trace amounts of δ-catenin. Our results indicate that analysis with 1 μg of CWR22Rv-1 and HEK293T cell lysates showed 918.67±103.8 and 874.33±37.21 MFI values, respectively. In conclusion, the results suggest that the procedure for detection of δ-catenin level through the antibody-conjugated magnetic beads provides a sensitive and costeffective solution for screening from patient specimens.