Rel/NF-kB proteins are dimeric, DNA sequence-specific transcription factors that coordinate inflammatory responses; innate and adaptive immunity; and cellular differentiation, proliferation, and survival in almost all multicellular organisms. In most cells NF-kB exists in the cytoplasm in an inactive complex bound to IkappaB. The NF-kB network consists of five family member protein monomers (p65/RelA, RelB, cRel, p50, and p52) that form homodimers or heterodimers that bind DNA differentially and are regulated by two pathways: the canonical, NF-kB essential modulator (NEMO)-dependent pathway and the noncanonical, NEMO-independent pathway.
The I Bs bind to NF-kB dimers and sterically block the function of their NLSs, thereby causing their cytoplasmic retention. Potent NF-kB activators, such as TNFα and IL-1, cause almost complete degradation of IkBs (especially I B ) by the 26S proteasome, and NF-kB is activated and enters the nucleus. Nfkb2/p100 is the primary signaling node at which canonical and noncanonical signals interact. NIK/IKK1 processes p100 into p52, enabling the activity of RelB, NIK degrades IkBδ, allowing for sustained RelA activity, and canonical pathway activity may boost noncanonical pathway activation of RelB:p52.
Activation of the NF-kB pathway is involved in the pathogenesis of chronic inflammatory diseases, such as asthma, rheumatoid arthritis, and inflammatory bowel disease. In addition, altered NF-kB regulation may be involved in other diseases such as atherosclerosis and Alzheimer’s disease and a variety of human cancers. Therefore, numerous drugs, natural products, and normal or recombinant proteins that inhibits NF-kB activation can used in the treatment of NF-kB-related diseases.
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