Open AccessThe IκB Kinase Complex and NF-κB Actas Master Regulators of Lipopolysaccharide-Induced Gene Expressionand Control Subordinate Activation ofAP-1
Author(s) -
Daniel Krappmann,
Elmar Wegener,
Yoshiaki Sunami,
Meral Esen,
Andreas Thiel,
Benjamin Mordmüller,
Claus Scheidereit
Publication year - 2004
Publication title -
molecular and cellular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.14
H-Index - 327
eISSN - 1067-8824
pISSN - 0270-7306
DOI - 10.1128/mcb.24.14.6488-6500.2004
Subject(s) - biology , junb , iκb kinase , signal transduction , nf κb , microbiology and biotechnology , innate immune system , tlr4 , chemokine , psychological repression , transcription factor , iκbα , kinase , trif , toll like receptor , gene expression , immune system , immunology , gene , genetics
Toll-like receptors (TLRs) recognize conserved products of microbial pathogens to initiate the innate immune response. TLR4 signaling is triggered upon binding of lipopolysaccharides (LPS) from gram-negative bacteria. Using comparative gene expression profiling, we demonstrate a master regulatory role of IkappaB kinase (IKK)/NF-kappaB signaling for immediate-early gene induction after LPS engagement in precursor B cells. IKK/NF-kappaB signaling controls a large panel of gene products associated with signaling and transcriptional activation and repression. Intriguingly, the induction of AP-1 activity by LPS in precursor B cells and primary dendritic cells fully depends on the IKK/NF-kappaB pathway, which promotes expression of several AP-1 family members, including JunB, JunD, and B-ATF. In pre-B cells, AP-1 augments induction of a subset of primary NF-kappaB targets, as shown for chemokine receptor 7 (CCR7) and immunoglobulin kappa light chain. Thus, our data illustrate that NF-kappaB orchestrates immediate-early effects of LPS signaling and controls secondary AP-1 activation to mount an appropriate biological response.