Abstract
Nuclear factor kappa B (NF-κB), which exists as heterodimeric complexes composed of p50 and p65, has been shown to play an important role in cell survival processes. In the present study, we found for the first time that NF-κB has an ability to induce the ubiquitin-dependent proteasomal degradation of proapoptotic p73α. The activation of NF-κB in tumor necrosis factor α (TNF-α)-stimulated H1299 cells resulted in a significant reduction in the amounts of the endogenous p73α. Consistent with these results, TNF-α-mediated downregulation of p73α was observed in wild-type (WT) mouse embryonic fibroblasts (MEFs) but not in p65-deficient MEFs. Ectopic expression of NF-κB decreased a half-life of p73α by increasing its ubiquitination levels, and thereby inhibiting the transcriptional activity as well as proapoptotic function of p73α, whereas NF-κB had undetectable effects on p53. Immunoprecipitation experiments demonstrated that, under our experimental conditions, NF-κB does not bind to p73α in mammalian cultured cells. In contrast to WT p65, the COOH-terminal deletion mutant of p65 (p65ΔC) failed to reduce the expression levels of p73α, suggesting that NF-κB-mediated proteolytic degradation of p73α requires the transcriptional activity of NF-κB. Taken together, our present results imply that NF-κB-mediated degradation of proapoptotic p73 is a novel inhibitory mechanism of p73 that regulates cell survival and death.
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Abbreviations
- CHX:
-
cycloheximide
- MEF:
-
mouse embryonic fibroblasts
- NF-κB:
-
nuclear factor kappa B
- TNF-α:
-
tumor necrosis factor α
- Ub:
-
ubiquitin
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Acknowledgements
We thank members of our laboratory for helpful discussions. We also thank Y Nakamura for excellent technical assistance. We give special thanks to Dr M Karin for providing us with p65−/− MEF. This work was supported in part by a Grant-in-Aid from the Ministry of Health, Labour and Welfare for Third Term Comprehensive Control Research for Cancer, a Grant-in-Aid for Scientific Research on Priority Areas from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science.
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Kikuchi, H., Ozaki, T., Furuya, K. et al. NF-κB regulates the stability and activity of p73 by inducing its proteolytic degradation through a ubiquitin-dependent proteasome pathway. Oncogene 25, 7608–7617 (2006). https://doi.org/10.1038/sj.onc.1209748
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DOI: https://doi.org/10.1038/sj.onc.1209748
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