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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Severe liver degeneration and lack of NF-kappaB activation in NEMO/IKKgamma-deficient mice.

Phosphorylation of IkappaB, an inhibitor of NF-kappaB, is an important step in the activation of the transcription factor NF-kappaB. Phosphorylation is mediated by the IkappaB kinase (IKK) complex, known to contain two catalytic subunits: IKKalpha and IKKbeta. A novel, noncatalytic component of this kinase complex called NEMO (NF-kappaB essential modulator)/IKKgamma was identified recently. We have generated NEMO/IKKgamma-deficient mice by gene targeting. Mutant embryos die at E12.5-E13.0 from severe liver damage due to apoptosis. NEMO/IKKgamma-deficient primary murine embryonic fibroblasts (MEFs) lack detectable NF-kappaB DNA- binding activity in response to TNFalpha, IL-1, LPS, and Poly(IC) and do not show stimulus-dependent IkappaB kinase activity, which correlates with a lack of phosphorylation and degradation of IkappaBalpha. Consistent with these data, mutant MEFs show increased sensitivity to TNFalpha-induced apoptosis. Our data provide in vivo evidence that NEMO/IKKgamma is the first essential, noncatalytic component of the IKK complex.[1]

References

  1. Severe liver degeneration and lack of NF-kappaB activation in NEMO/IKKgamma-deficient mice. Rudolph, D., Yeh, W.C., Wakeham, A., Rudolph, B., Nallainathan, D., Potter, J., Elia, A.J., Mak, T.W. Genes Dev. (2000) [Pubmed]
 
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