Mechanism of rapid transcriptional induction of tumor necrosis factor alpha-responsive genes by NF-kappaB

NF-kappaB induces the expression of genes involved in immune response, apoptosis, inflammation, and the cell cycle. Certain NF-kappaB-responsive genes are activated rapidly after the cell is stimulated by cytokines and other extracellular signals. However, the mechanism by which these genes are acti...

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Vydáno v:Molecular and cellular biology Ročník 22; číslo 18; s. 6354
Hlavní autoři: Ainbinder, Elena, Revach, Merav, Wolstein, Orit, Moshonov, Sandra, Diamant, Noam, Dikstein, Rivka
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.09.2002
Témata:
Chromatin - metabolism
Dose-Response Relationship, Drug
Humans
Jurkat Cells
Models, Biological
Models, Genetic
NF-kappa B - metabolism
Plasmids - metabolism
Precipitin Tests
Promoter Regions, Genetic
Protein Binding
Sp1 Transcription Factor - metabolism
Time Factors
Transcription Factor TFIID
Transcription Factors, TFII - metabolism
Transcription, Genetic
Tumor Necrosis Factor-alpha - metabolism
ISSN:0270-7306
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Shrnutí:NF-kappaB induces the expression of genes involved in immune response, apoptosis, inflammation, and the cell cycle. Certain NF-kappaB-responsive genes are activated rapidly after the cell is stimulated by cytokines and other extracellular signals. However, the mechanism by which these genes are activated is not entirely understood. Here we report that even though NF-kappaB interacts directly with TAF(II)s, induction of NF-kappaB by tumor necrosis factor alpha (TNF-alpha) does not enhance TFIID recruitment and preinitiation complex formation on some NF-kappaB-responsive promoters. These promoters are bound by the transcription apparatus prior to TNF-alpha stimulus. Using the immediate-early TNF-alpha-responsive gene A20 as a prototype promoter, we found that the constitutive association of the general transcription apparatus is mediated by Sp1 and that this is crucial for rapid transcriptional induction by NF-kappaB. In vitro transcription assays confirmed that NF-kappaB plays a postinitiation role since it enhances the transcription reinitiation rate whereas Sp1 is required for the initiation step. Thus, the consecutive effects of Sp1 and NF-kappaB on the transcription process underlie the mechanism of their synergy and allow rapid transcriptional induction in response to cytokines.
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ISSN:0270-7306
DOI:10.1128/MCB.22.18.6354-6362.2002