NF-kappa B activation in human breast cancer specimens and its role in cell proliferation and apoptosis

Proceedings of the National Academy of Sciences of the United States of America
Debajit K BiswasJ Dirk Iglehart

Abstract

Lack of molecular targets in estrogen receptor-negative (ER-negative) breast cancer is a major therapeutic hurdle. We studied NF-kappa B activation in human breast tumors and in carcinoma cell lines. Activated NF-kappa B was detected predominantly in ER-negative vs. ER-positive breast tumors and mostly in ER-negative and ErbB2-positive tumors (86%). These in vivo results demonstrate association of activated NF-kappa B with a subgroup of human breast tumors and are consistent with previously reported in vitro observations using similar classes of human breast cancer cell lines. Finding such an association suggested functional and biological significance. Immunofluorescence demonstrated increased nuclear p65, a component of the active NF-kappa B complex, in cytokeratin 19 (CK19)-positive epithelial cells of ER-negative/ErbB2-positive tumor samples. In contrast, nuclear NF-kappa B was detected mostly in stroma of ER-negative and ErbB2-negative tumors, suggesting a role of activated NF-kappa B in intercellular signaling between epithelial and stromal cells in this type of breast cancers. To elucidate roles of activated NF-kappa B, we used an ER-negative and ErbB2-positive human breast tumor cell line (SKBr3). The polypeptide heregu...Continue Reading

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