Resumo

ECHEVERRI R, Nancy P  e  MOCKUS S, Ismena. Nuclear factor kB (NF-KB) : signalosoma and its importance in cancer and inflammatories diseases . rev.fac.med. [online]. 2008, vol.56, n.2, pp.133-146. ISSN 0120-0011.

The nuclear factor κB (NF-κB) is a dimer conformed by Reí family. NF-κB is found in cytoplasm bound to inhibitor proteins (IkB). IkB are phosphorilated by different kinases who are part of signalosome as IéB kinases (IKKα, IKKP and NF-κB essential modulator or NEMO), the mitogenic activated protein kinase (MAPK or p38) and NF-éB inducer kinase (NIK). These kinases are activated by different cytokines and ultraviolet light, IkB phosphorilated induce their ubiquitination and proteosome degradation subsequently NF-κB reléase and nucleus translocation. Nowadays, the NF-κB activation by oxidative stress, genotoxic stress and DNA damage pathways. In contrast with the classical pathway, in this pathway there are a SUMOilation and nuclear translocation of NEMO. In nucleus NEMO interact with ataxia telangiectasia muted which is activated by chromatin changes and DNA damage. The complex ATM/NEMO is later translocated to cytoplasm where IKKß is phosphorilated by ATM bringing to ubiquitination and thus NF-κB releasing which is translocated to nucleus. NF-κB induces survival rising antioxidants enzymes as superoxide dismutase, catalase and glutathione. These enzymes act in the control of oxidative species levels in the cell. NF-κB over expression is related with inflammation and cancer. Nowadays, is development a pharmacological search which can act inhibiting NF-κB signalosome molecules, not only to inflammatory disease whereas to radiotherapy and chemotherapy cancer resistance.

Palavras-chave : ataxia telangiectasia; neoplasms; inflammation; enzymes; antioxidants.

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