A murine monoclonal antibody (mAb), CLD3 (IgG(1),kappa), 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.
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Luk et al. (2005) studied this question.
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