TY - JOUR
T1 - Regulation of NF-κB circuitry by a component of the nucleosome remodeling and deacetylase complex controls inflammatory response homeostasis
AU - Pakala, Suresh B.
AU - Bui-Nguyen, Tri M.
AU - Reddy, Sirigiri Divijendra Natha
AU - Li, Da Qiang
AU - Peng, Shaohua
AU - Rayala, Suresh K.
AU - Behringer, Richard R.
AU - Kumar, Rakesh
PY - 2010/7/30
Y1 - 2010/7/30
N2 - The MTA1 coregulator (metastatic tumor antigen 1), a component of the nucleosome remodeling and deacetylase (NuRD) complex, has been intimately linked with human cancer, but its role in inflammatory responses remains unknown. Here, we discovered that MTA1 is a target of inflammation, and stimulation of macrophages with Escherichia coli lipopolysaccharide (LPS) stimulates MTA1 transcription via the NF-κB pathway. Unexpectedly, we found that MTA1 depletion in LPS-stimulated macrophages impairs NF-κB signaling and expression of inflammatory molecules. MTA1 itself acts as a transcriptional coactivator of inflammatory cytokines in LPS-stimulated macrophages, and in contrast, it acts as a corepressor in resting primary macrophages as its depletion induced cytokine expression. LPS stimulates S-nitrosylation of histone deacetylase 2 (HDAC2) and interferes with its binding to MTA1, which, in turn, resulted in the loss of corepressor behavior of MTA1·HDAC complex in activated macrophages. Consequently, the net levels of inflammatory cytokines in LPS-stimulated macrophages from MTA1-/- mice were high compared with wild-type mice. Accordingly, MTA1-/- mice were much more susceptible than control mice to septic shock induced by LPS, revealing that MTA1 protects mice from deregulated host inflammatory response. These findings reveal a previously unrecognized, critical homeostatic role of MTA1, both as a target and as a component of the NF-κB circuitry, in the regulation of inflammatory responses.
AB - The MTA1 coregulator (metastatic tumor antigen 1), a component of the nucleosome remodeling and deacetylase (NuRD) complex, has been intimately linked with human cancer, but its role in inflammatory responses remains unknown. Here, we discovered that MTA1 is a target of inflammation, and stimulation of macrophages with Escherichia coli lipopolysaccharide (LPS) stimulates MTA1 transcription via the NF-κB pathway. Unexpectedly, we found that MTA1 depletion in LPS-stimulated macrophages impairs NF-κB signaling and expression of inflammatory molecules. MTA1 itself acts as a transcriptional coactivator of inflammatory cytokines in LPS-stimulated macrophages, and in contrast, it acts as a corepressor in resting primary macrophages as its depletion induced cytokine expression. LPS stimulates S-nitrosylation of histone deacetylase 2 (HDAC2) and interferes with its binding to MTA1, which, in turn, resulted in the loss of corepressor behavior of MTA1·HDAC complex in activated macrophages. Consequently, the net levels of inflammatory cytokines in LPS-stimulated macrophages from MTA1-/- mice were high compared with wild-type mice. Accordingly, MTA1-/- mice were much more susceptible than control mice to septic shock induced by LPS, revealing that MTA1 protects mice from deregulated host inflammatory response. These findings reveal a previously unrecognized, critical homeostatic role of MTA1, both as a target and as a component of the NF-κB circuitry, in the regulation of inflammatory responses.
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U2 - 10.1074/jbc.M110.139469
DO - 10.1074/jbc.M110.139469
M3 - Article
C2 - 20519513
AN - SCOPUS:77954900569
SN - 0021-9258
VL - 285
SP - 23590
EP - 23597
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 31
ER -