The Tumor Suppressor, p53, Negatively Regulates Non-Canonical NF-kappa B Signaling through miRNA-Induced Silencing of NF-kappa B-Inducing Kinase

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NF-kappa B signaling through both canonical and non-canonical pathways plays a central role in immune responses and inflammation. NF-kappa B-inducing kinase (NIK) stabilization is a key step in activation of the non-canonical pathway and its dysregulation implicated in various hematologic malignancies. The tumor suppressor, p53, is an established cellular gatekeeper of proliferation. Abnormalities of the TP53 gene have been detected in more than half of all human cancers. While the non-canonical NF-kappa B and p53 pathways have been explored for several decades, no studies to date have documented potential cross-talk between these two cancer-related mechanisms. Here, we demonstrate that p53 negatively regulates NIK in an miRNA-dependent manner. Overexpression of p53 decreased the levels of NIK, leading to inhibition of the non-canonical NF-kappa B pathway. Conversely, its knockdown led to increased levels of NIK, IKK alpha phosphorylation, and p100 processing. Additionally, miR-34b induced by nutlin-3 directly targeted the coding sequences (CDS) of NIK. Treatment with anti-miR-34b-5p augmented NIK levels and subsequent non-canonical NF-kappa B signaling. Our collective findings support a novel cross-talk mechanism between non-canonical NF-kappa B and p53.
Publisher
KOREAN SOC MOLECULAR & CELLULAR BIOLOGY
Issue Date
2020-01
Language
English
Article Type
Article
Citation

MOLECULES AND CELLS, v.43, no.1, pp.23 - 33

ISSN
1016-8478
DOI
10.14348/molcells.2019.0239
URI
http://hdl.handle.net/10203/272431
Appears in Collection
BS-Journal Papers(저널논문)
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