Downregulation of IgG Fc binding protein (Fc gamma BP) in prostate cancer

By means of protein expression profile, mass spectral and/or RT-PCR analyses we found for the first time IgG Fc binding protein (Fc gamma BP), distinct from Fc gamma receptors is expressed in both human and mouse prostates. There is a strong correlation between downregulation of Fc gamma BP and the progression of prostate cancer in Transgenic Adenocarcinoma Mouse Prostate (TRAMP) mice. Fc gamma BP gene expression is significantly reduced or lost in human prostate tumor tissues and prostate cell lines. The differentially expressed Fc gamma BP could reflect its potential role in prostate malignancy as well as an indicator for progression of the cancer.