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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Ann+Rheum+Dis
2017 ; 76
(3
): 612-619
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Treatment of inflammatory arthritis via targeting of tristetraprolin, a master
regulator of pro-inflammatory gene expression
#MMPMID27597652
Ross EA
; Naylor AJ
; O'Neil JD
; Crowley T
; Ridley ML
; Crowe J
; Smallie T
; Tang TJ
; Turner JD
; Norling LV
; Dominguez S
; Perlman H
; Verrills NM
; Kollias G
; Vitek MP
; Filer A
; Buckley CD
; Dean JL
; Clark AR
Ann Rheum Dis
2017[Mar]; 76
(3
): 612-619
PMID27597652
show ga
OBJECTIVES: Tristetraprolin (TTP), a negative regulator of many pro-inflammatory
genes, is strongly expressed in rheumatoid synovial cells. The mitogen-activated
protein kinase (MAPK) p38 pathway mediates the inactivation of TTP via
phosphorylation of two serine residues. We wished to test the hypothesis that
these phosphorylations contribute to the development of inflammatory arthritis,
and that, conversely, joint inflammation may be inhibited by promoting the
dephosphorylation and activation of TTP. METHODS: The expression of TTP and its
relationship with MAPK p38 activity were examined in non-inflamed and rheumatoid
arthritis (RA) synovial tissue. Experimental arthritis was induced in a
genetically modified mouse strain, in which endogenous TTP cannot be
phosphorylated and inactivated. In vitro and in vivo experiments were performed
to test anti-inflammatory effects of compounds that activate the protein
phosphatase 2A (PP2A) and promote dephosphorylation of TTP. RESULTS: TTP
expression was significantly higher in RA than non-inflamed synovium, detected in
macrophages, vascular endothelial cells and some fibroblasts and co-localised
with MAPK p38 activation. Substitution of TTP phosphorylation sites conferred
dramatic protection against inflammatory arthritis in mice. Two distinct PP2A
agonists also reduced inflammation and prevented bone erosion. In vitro
anti-inflammatory effects of PP2A agonism were mediated by TTP activation.
CONCLUSIONS: The phosphorylation state of TTP is a critical determinant of
inflammatory responses, and a tractable target for novel anti-inflammatory
treatments.
|Amino Alcohols/therapeutic use
[MESH]
|Animals
[MESH]
|Apolipoproteins E/therapeutic use
[MESH]
|Arthritis, Rheumatoid/*drug therapy/*enzymology/immunology/prevention & control
[MESH]