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    Science. 1999 Apr 9;284(5412):321-5.

    Severe liver degeneration in mice lacking the IkappaB kinase 2 gene.

    Li Q, Van Antwerp D, Mercurio F, Lee KF, Verma IM.

    Source

    Salk Institute, La Jolla, CA 92037, USA. Signal Pharmaceuticals, San Diego, CA 92121, USA.

    Abstract

    Phosphorylation of inhibitor of kappa B (IkappaB) proteins is an important step in the activation of the transcription nuclear factor kappa B (NF-kappaB) and requires two IkappaB kinases, IKK1 (IKKalpha) and IKK2 (IKKbeta). Mice that are devoid of the IKK2 gene had extensive liver damage from apoptosis and died as embryos, but these mice could be rescued by the inactivation of the gene encoding tumor necrosis factor receptor 1. Mouse embryonic fibroblast cells that were isolated from IKK2-/- embryos showed a marked reduction in tumor necrosis factor-alpha (TNF-alpha)- and interleukin-1alpha-induced NF-kappaB activity and an enhanced apoptosis in response to TNF-alpha. IKK1 associated with NF-kappaB essential modulator (IKKgamma/IKKAP1), another component of the IKK complex. These results show that IKK2 is essential for mouse development and cannot be substituted with IKK1.

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    PMID:
    10195897
    [PubMed - indexed for MEDLINE]

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