The NF-κB regulatory network

Abstract

Nuclear factor (NF)-κB is a family of seven structurally related transcription factors that play a central role in cardiovascular growth, stress response, and inflammation by controlling gene network expression. Although the NF-κB subunits are ubiquitously expressed, their actions are regulated in a cell-type and stimulus-specific manner, allowing for a diverse spectrum of effects. For example, NF-κB is activated by cytokines, reactive oxygen species, bacterial cell wall products, vasopressors, viral infection, and DNA damage. Recent molecular dissection of its mechanisms for activation has shown that NF-κB can be induced by the so-called “canonical” and “noncanonical” pathways, leading to distinct patterns in the individual subunits activated and down-stream genetic responses produced. The canonical pathway involves activating the IκB kinase (IKK) with subsequent phosphorylation-induced proteolysis of the IκBα inhibitors and consequent nuclear translocation of the Rel A transcriptional activator. Recent work using high-density oligonucleotide arrays have begun to systematically dissect the scope of the gene network under canonical NF-κB control and have yielded important insights into biological pathways controlled by it. This pathway controls expression of noncontiguous, functionally discrete groups of genes (“regulons”), whose temporal expression occurs in waves. Moreover, its mode of activation (oscillatory or monophasic) plays an important role in determining the spectrum of target genes expressed. By contrast, the noncanonical NF-κB activation pathway involves activating the NF-κB inducing kinase (NIK) to stimulate IKKα-induced phosphorylation and proteolytic processing of the 100-kDa cytoplasmic NF-κB2 precursor. Activated NF-κB2 then forms a complex with Rel B and NIK to translocate into the nucleus thereby activating a distinct set of genes. Although the noncanonical pathway has been most clearly linked to control of adaptive immunity, recent intriguing studies have implicated this pathway in viral induced stress response and in the metabolic syndrome. In this way, a single family of transcription factors can respond to diverse stimuli to regulate cardiovascular homeostasis.

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Correspondence to Allan R. Brasier.

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Brasier, A.R. The NF-κB regulatory network. Cardiovasc Toxicol 6, 111–130 (2006). https://doi.org/10.1385/CT:6:2:111

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Index Entries

  • NF-κB/Rel A
  • IκB kinase (IKK)
  • Nuclear factor-κB essential modulator (NEMO)
  • IKKγ
  • canonical pathway
  • noncanonical pathway
  • NF-κB-inducing kinase (NIK)
  • gene networks