Abstract
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.
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Acknowledgments
S.M. Frisch was supported by NIH Grant R01CA123359. The flow cytometry core facility (Mary Babb Randolph Cancer Center) was supported by NIH Grants RR020866 and P20 RR16440 and we thank Kathy Brundage for performing the flow-sorting. We also wish to thank Zenkun Lou, Eduardo Chini for the DBC1-knockout cells, Alexey Ivanov, Elena Pugacheva, Jurg Tschopp, Russ Carstens, Yon Rojanasakul and Sierra Talbott for constructs; we also thank the Biochemistry Protein Core for assistance with recombinant protein production.
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