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2015 ; 7
(6
): 572-83
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Processing Body Formation Limits Proinflammatory Cytokine Synthesis in
Endotoxin-Tolerant Monocytes and Murine Septic Macrophages
#MMPMID25998849
McClure C
; Brudecki L
; Yao ZQ
; McCall CE
; El Gazzar M
J Innate Immun
2015[]; 7
(6
): 572-83
PMID25998849
show ga
An anti-inflammatory phenotype with pronounced immunosuppression develops during
sepsis, during which time neutrophils and monocytes/macrophages limit their
Toll-like receptor 4 responses to bacterial lipopolysaccharide (LPS/endotoxin).
We previously reported that during this endotoxin-tolerant state, distinct
signaling pathways differentially repress transcription and translation of
proinflammatory cytokines such as TNF? and IL-6. Sustained endotoxin tolerance
contributes to sepsis mortality. While transcription repression requires
chromatin modifications, a translational repressor complex of Argonaute 2 (Ago2)
and RNA-binding motif protein 4 (RBM4), which bind the 3'-UTR of TNF? and IL-6
mRNA, limits protein synthesis. Here, we show that Dcp1 supports the assembly of
the Ago2 and RBM4 repressor complex into cytoplasmic processing bodies (p-bodies)
in endotoxin-tolerant THP-1 human monocytes following stimulation with LPS,
resulting in translational repression and limiting protein synthesis.
Importantly, this translocation process is reversed by Dcp1 knockdown, which
restores TNF? and IL-6 protein levels. We also find this translational repression
mechanism in primary macrophages of septic mice. Because p-body formation is a
critical step in mRNA translation repression, we conclude that Dcp1 is a major
component of the translational repression machinery of endotoxin tolerance and
may contribute to sepsis outcome.