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SZ117 is a monoclonal antibody against matrix metalloproteinase-2 (MMP-2) and exhibits anti-tumor angiogenic effect. In this study, we observed that SZ117 bound to a 280 kDa protein, which was detected in tumor cell-derived Matrigel and various tumor cells. Using immunoprecipitation, mass spectrometry analysis, and Western blot analysis, we identified the 280 kDa protein as filamin A and found that filamin A and its degraded products, notably a 53 kDa fragment, were released from a variety of tumor cells. This suggests that SZ117 is useful in the study of the pathogenesis of filamin A and that blockage of filamin A by SZ117 might contribute to the anti-tumor angiogenic effect of the monoclonal antibody.

A Monoclonal Antibody SZ-117 That Recognizes Filamin A Derived from Tumor Cells