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2015 ; 195
(1
): 265-76
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Dominant Suppression of Inflammation via Targeted Mutation of the mRNA
Destabilizing Protein Tristetraprolin
#MMPMID26002976
Ross EA
; Smallie T
; Ding Q
; O'Neil JD
; Cunliffe HE
; Tang T
; Rosner DR
; Klevernic I
; Morrice NA
; Monaco C
; Cunningham AF
; Buckley CD
; Saklatvala J
; Dean JL
; Clark AR
J Immunol
2015[Jul]; 195
(1
): 265-76
PMID26002976
show ga
In myeloid cells, the mRNA-destabilizing protein tristetraprolin (TTP) is induced
and extensively phosphorylated in response to LPS. To investigate the role of two
specific phosphorylations, at serines 52 and 178, we created a mouse strain in
which those residues were replaced by nonphosphorylatable alanine residues. The
mutant form of TTP was constitutively degraded by the proteasome and therefore
expressed at low levels, yet it functioned as a potent mRNA destabilizing factor
and inhibitor of the expression of many inflammatory mediators. Mice expressing
only the mutant form of TTP were healthy and fertile, and their systemic
inflammatory responses to LPS were strongly attenuated. Adaptive immune responses
and protection against infection by Salmonella typhimurium were spared. A single
allele encoding the mutant form of TTP was sufficient for enhanced mRNA
degradation and underexpression of inflammatory mediators. Therefore, the
equilibrium between unphosphorylated and phosphorylated TTP is a critical
determinant of the inflammatory response, and manipulation of this equilibrium
may be a means of treating inflammatory pathologies.