Journal
CANCER SCIENCE
Volume 98, Issue 3, Pages 268-274Publisher
WILEY
DOI: 10.1111/j.1349-7006.2007.00389.x
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Nuclear factor-kappa B (NF-kappa B) binds specifically to NF-kappa B-binding sites (kappa B sites, 5'-GGGRNNYYCC-3'; R, purine; Y, pyrimidine; N, any nucleotide) present in enhancer regions of various genes. Binding of various cytokines, growth factors and pathogen-associated molecular patterns to specific receptors activates NF-kappa B and expression of genes that play critical roles in inflammation, innate and acquired immunity, bone remodeling and generation of skin appendices. Activation of NF-kappa B is also involved in cancer development and progression. NF-kappa B is activated in cells that become malignant tumors and in cells that are recruited to and constitute the tumor microenvironment. In the latter scenario, the TLR-TRAF6-NF-kappa B pathways seem to play major roles, and NF-kappa B activation results in production of cytokines, which in turn induce NF-kappa B activation in premalignant cells, leading to expression of genes involved abnormal growth and malignancy. Furthermore, NF-kappa B activation is involved in bone metastasis. Osteoclasts, whose generation requires the RANK-TRAF6-NF-kappa B pathways, release various growth factors stored in bone, which results in creation of microenvironment suitable for proliferation and colonization of cancer cells. Therefore, NF-kappa B and molecules involved its activation, such as TRAF6, are attractive targets for therapeutic strategies against cancer.
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