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Science 16 September 2005:
Vol. 309. no. 5742, pp. 1857 - 1861
DOI: 10.1126/science.1113319
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Reports

Stimulus Specificity of Gene Expression Programs Determined by Temporal Control of IKK Activity

Shannon L. Werner,* Derren Barken,* Alexander Hoffmann{dagger}

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 I{kappa}B kinase (IKK), its substrate inhibitor of NF-{kappa}B (I{kappa}B), and the key inflammatory transcription factor NF-{kappa}B 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} (TNF{alpha})-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 TNF{alpha} depend on signaling pathway-specific mechanisms that regulate the temporal profile of IKK activity.

Signaling Systems Laboratory, Department of Chemistry and Biochemistry, 9500 Gilman Drive, Mailcode 0375, La Jolla, CA 92093-0375, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: ahoffmann{at}ucsd.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)