The possible role of factor H in colon cancer resistance to complement attack

International Journal of Cancer. Journal International Du Cancer
Ewa WilczekGrzegorz M Wilczynski

Abstract

A soluble complement inhibitor factor H (FH) and its splice variant factor H-like protein (FHL) have been recently discovered to play a major role in malignant cell escape from complement-mediated cytotoxicity in lung-, ovarian- and glia-derived neoplasms. The role of FH in colon cancer has not yet been examined. Here, we studied immunocytochemically FH/FHL expression in tumor samples derived from 40 patients, with both primary colon adenocarcinoma and metastatic foci in the liver. FH/FHL immunoreactivity was present in stroma of both primary and metastatic tumors, in virtually all patients. The cellular immunoreactivity was observed infrequently. Importantly, when analyzed quantitatively, FH/FHL immunoreactivity was significantly increased in liver metastases when compared with the primary sites. In addition, we have analyzed FH and FHL expression in 5 colon cancer cell lines: SW480, SW620, HCT116, HT-29 and Lovo. FH mRNA and FH secretion were observed in SW620 and HT-29 cells, whereas FHL was produced only by HT-29 cell-line. By confocal and electron microscopy, FH immunoreactivity was associated with the plasma membrane and intracellular vesicular structures. Finally, we have analyzed the role of FH in the susceptibility of ...Continue Reading

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