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Achieving Stability of Lipopolysaccharide-Induced NF-B Activation
Markus W. Covert,*Thomas H. Leung,*Jahlionais E. Gaston,David Baltimore
The activation dynamics of the transcription factor NF-B exhibitdamped oscillatory behavior when cells are stimulated by tumornecrosis factor (TNF) but stable behavior when stimulatedby lipopolysaccharide (LPS). LPS binding to Toll-like receptor4 (TLR4) causes activation of NF-B that requires two downstreampathways, each of which when isolated exhibits damped oscillatorybehavior. Computational modeling of the two TLR4-dependent signalingpathways suggests that one pathway requires a time delay toestablish early anti-phase activation of NF-B by the two pathways.The MyD88-independent pathway required Inferon regulatory factor3dependent expression of TNF to activate NF-B, and thetime required for TNF synthesis established the delay.
Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: baltimo{at}caltech.edu
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