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2015 ; 195
(1
): 277-88
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Dual-Specificity Phosphatase 1 and Tristetraprolin Cooperate To Regulate
Macrophage Responses to Lipopolysaccharide
#MMPMID26019272
Smallie T
; Ross EA
; Ammit AJ
; Cunliffe HE
; Tang T
; Rosner DR
; Ridley ML
; Buckley CD
; Saklatvala J
; Dean JL
; Clark AR
J Immunol
2015[Jul]; 195
(1
): 277-88
PMID26019272
show ga
Dual-specificity phosphatase (DUSP) 1 dephosphorylates and inactivates members of
the MAPK superfamily, in particular, JNKs, p38?, and p38? MAPKs. It functions as
an essential negative regulator of innate immune responses, hence disruption of
the Dusp1 gene renders mice extremely sensitive to a wide variety of experimental
inflammatory challenges. The principal mechanisms behind the overexpression of
inflammatory mediators by Dusp1(-/-) cells are not known. In this study, we use a
genetic approach to identify an important mechanism of action of DUSP1, involving
the modulation of the activity of the mRNA-destabilizing protein tristetraprolin.
This mechanism is key to the control of essential early mediators of
inflammation, TNF, CXCL1, and CXCL2, as well as the anti-inflammatory cytokine
IL-10. The same mechanism also contributes to the regulation of a large number of
transcripts induced by treatment of macrophages with LPS. These findings
demonstrate that modulation of the phosphorylation status of tristetraprolin is
an important physiological mechanism by which innate immune responses can be
controlled.