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2016 ; 197
(6
): 2219-28
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MicroRNA-17 Suppresses TNF-? Signaling by Interfering with TRAF2 and cIAP2
Association in Rheumatoid Arthritis Synovial Fibroblasts
#MMPMID27534557
Akhtar N
; Singh AK
; Ahmed S
J Immunol
2016[Sep]; 197
(6
): 2219-28
PMID27534557
show ga
TNF-? is a major cytokine implicated in rheumatoid arthritis (RA), and its
expression is regulated at the transcriptional and posttranscriptional levels.
However, the impact of changes in microRNA expression on posttranslational
processes involved in TNF-? signaling networks is not well defined in RA. In this
study, we evaluated the effect of miR-17, a member of the miR-17-92 cluster, on
the TNF-? signaling pathway in human RA synovial fibroblasts (SFs). We
demonstrated that miR-17 expression was significantly low in RA serum, SFs, and
synovial tissues, as well as in the serum and joints of adjuvant-induced
arthritis rats. RNA-sequencing analysis showed modulation of 664 genes by
pre-miR-17 in human RA SFs. Ingenuity pathway analysis of RNA-sequencing data
identified the ubiquitin proteasome system in the TNF-? signaling pathway as a
primary target of miR-17. Western blot analysis confirmed the reduction in TRAF2,
cIAP1, cIAP2, USP2, and PSMD13 expression by miR-17 in TNF-?-stimulated RA SFs.
Immunoprecipitation assays showed that miR-17 restoration increased the
K48-linked polyubiquitination of TRAF2, cIAP1, and cIAP2 in TNF-?-stimulated RA
SFs. Thus, destabilization of TRAF2 by miR-17 reduced the ability of TRAF2 to
associate with cIAP2, resulting in the downregulation of TNF-?-induced NF-?Bp65,
c-Jun, and STAT3 nuclear translocation and the production of IL-6, IL-8, MMP-1,
and MMP-13 in human RA SFs. In conclusion, this study provides evidence for the
role of miR-17 as a negative regulator of TNF-? signaling by modulating the
protein ubiquitin processes in RA SFs.