Proteomic identification of Ku70/Ku80 autoantigen recognized by monoclonal antibody against hepatocellular carcinoma

Abstract

A murine monoclonal antibody (mAb), CLD3 (IgG1,κ), was generated against hepatocellular carcinoma (HCC). Both immunofluorescence and immunohistochemical assays indicated the reactivity of CLD3 mAb localized at the nucleus and/or cytoplasm of tumorigenic HCC cell lines as well as in liver cancer tissues. By immunoprecipitation and using the matrix-assisted laser desorption/ionization-time of flight mass spectrometry approach, the antigenic specificity of CLD3 was determined to be heterodimeric Ku70 and Ku80 autoantigen, which was confirmed by Western blotting. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA.link_to_subscribed_fulltex