Stimulus specificity of gene expression programs determined by temporal control of IKK activity - PubMed (original) (raw)
. 2005 Sep 16;309(5742):1857-61.
doi: 10.1126/science.1113319.
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- PMID: 16166517
- DOI: 10.1126/science.1113319
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Stimulus specificity of gene expression programs determined by temporal control of IKK activity
Shannon L Werner et al. Science. 2005.
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Abstract
A small number of mammalian signaling pathways mediate a myriad of distinct physiological responses to diverse cellular stimuli. Temporal control of the signaling module that contains IkappaB kinase (IKK), its substrate inhibitor of NF-kappaB (IkappaB), and the key inflammatory transcription factor NF-kappaB can allow for selective gene activation. We have demonstrated that different inflammatory stimuli induce distinct IKK profiles, and we examined the underlying molecular mechanisms. Although tumor necrosis factor-alpha (TNFalpha)-induced IKK activity was rapidly attenuated by negative feedback, lipopolysaccharide (LPS) signaling and LPS-specific gene expression programs were dependent on a cytokine-mediated positive feedback mechanism. Thus, the distinct biological responses to LPS and TNFalpha depend on signaling pathway-specific mechanisms that regulate the temporal profile of IKK activity.
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