Abstract
Nuclear factor-κB (NF-κB) inducing kinase (NIK) is a MAP3K that regulates the activation of NF-κB. NIK is often highly expressed in tumor cells, including melanoma, but the significance of this in melanoma progression has been unclear. Tissue microarray analysis of NIK expression reveals that dysplastic nevi (n=22), primary (n=15) and metastatic melanoma (n=13) lesions showed a statistically significant elevation in NIK expression when compared with benign nevi (n=30). Moreover, when short hairpin RNA techniques were used to knock-down NIK, the resultant NIK-depleted melanoma cell lines exhibited decreased proliferation, increased apoptosis, delayed cell cycle progression and reduced tumor growth in a mouse xenograft model. As expected, when NIK was depleted there was decreased activation of the non-canonical NF-κB pathway, whereas canonical NF-κB activation remained intact. NIK depletion also resulted in reduced expression of genes that contribute to tumor growth, including CXCR4, c-MYC and c-MET, and pro-survival factors such as BCL2 and survivin. These changes in gene expression are not fully explained by the attenuation of the non-canonical NF-κB pathway. Shown here for the first time is the demonstration that NIK modulates β-catenin-mediated transcription to promote expression of survivin. NIK-depleted melanoma cells exhibited downregulation of survivin as well as other β-catenin regulated genes including c-MYC, c-MET and CCND2. These data indicate that NIK mediates both β-catenin and NF-κB regulated transcription to modulate melanoma survival and growth. Thus, NIK may be a promising therapeutic target for melanoma.
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Acknowledgements
We would like to thank Dr Robert Schreiber (Washington University) for generously sharing Nik−/− MEFs, and Vanderbilt Functional Genomic Shared Resource Core, VA Flow Cytometry Core and Vanderbilt Immunohistochemistry Core for technical help. We thank Dr Joseph T Roland (Epithelial Biology Center) for assistance with the ariol scanning and quantitation of TMAs. We thank Dr Mark Kelly and Vanderbilt melanoma group for providing melanoma tissues and Dr Sara Kantrow for reviewing some of the TMA slides. We thank Dr Fiona Yull and Dr Punita Dhawan for thoughtful discussion and Vanderbilt Editor Club for careful reading of the manuscript. Grant Support: This work is supported by NIH, CA 098807-01 and the Department of Veterans Affairs, Career Scientist Award and Merit Award (to AR).
Author contributions: Designed experiments and wrote paper: YMT and AR. Performed experiments: YMT, YS, JY and RS. Analyzed data: YMT, JY and RS. Shared reagents: SN. Contributed human tissue samples for TMA: AB, CS and CM.
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Thu, Y., Su, Y., Yang, J. et al. NF-κB inducing kinase (NIK) modulates melanoma tumorigenesis by regulating expression of pro-survival factors through the β-catenin pathway. Oncogene 31, 2580–2592 (2012). https://doi.org/10.1038/onc.2011.427
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DOI: https://doi.org/10.1038/onc.2011.427