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Anoikis-resistance of tumor cells is critical for anchorage-independent growth and metastasis. The inflammatory-response transcription factor NF-κB contributes to anoikis-resistance and tumor progression through mechanisms that are understood incompletely. Deleted in breast cancer-1 (DBC1) protein (KIAA1967) is over-expressed in several tumor types, and correlates with a poorer prognosis in some cases. We report here that DBC1 suppressed anoikis in normal epithelial and breast cancer cell lines. DBC1 interacted with IKK-β, stimulating its kinase activity, promoting NF-κB transcriptional activity through the phosphorylation of relA serine-536 and enhancing the expression of the NF-κB target genes, c-FLIP and bcl-xl. Our results indicate that DBC1 is an important co-factor for the control of the IKK-β-NF-κB signaling pathway that regulates anoikis.

Regulation of anoikis by deleted in breast cancer-1 (DBC1) through NF-κB