PMID: 9185710Jun 11, 1997Paper

Expression and function of the complement membrane attack complex inhibitor protectin (CD59) in human prostate cancer

International Journal of Cancer. Journal International Du Cancer
G A JarvisS Meri

Abstract

Protectin (CD59) inhibits homologous complement-mediated cytolysis by preventing formation of the membrane attack complex at the point of insertion and polymerization of C9 into cell membranes. The present study investigated the expression and function of CD59 on human prostatic tumor cells in situ and on 5 human prostate cell lines in vitro originating from either metastatic tumors or benign prostate hypertrophy epithelial cells. Immunohistochemical staining of prostate carcinoma tissue with monoclonal antibody (MAb) MEM43 revealed weak to moderately strong expression of CD59 by prostate glandular epithelial cells. Flow cytometry with MEM43 demonstrated that the 5 prostate cell lines expressed different relative quantities of CD59. Indirect immunofluorescence analysis revealed uniform membrane staining of DU145 and PC3 cell lines with no membranous granularity in the staining pattern. Western immunoblots with MAb BRIC 229 showed that PC3 and DU145 cells express CD59 with a m.w. of 18-25 kDa. Treatment of DU 145 and PC3 cells with phosphatidylinositol-specific phospholipase C caused a significant decrease of CD59 expression indicating that the CD59 expressed by prostate cancer cells is anchored to the cell membrane via a glycos...Continue Reading

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Citations

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