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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 Arthritis+Rheumatol
2016 ; 68
(9
): 2300-13
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Monocyte MicroRNA Expression in Active Systemic Juvenile Idiopathic Arthritis
Implicates MicroRNA-125a-5p in Polarized Monocyte Phenotypes
#MMPMID27014994
Schulert GS
; Fall N
; Harley JB
; Shen N
; Lovell DJ
; Thornton S
; Grom AA
Arthritis Rheumatol
2016[Sep]; 68
(9
): 2300-13
PMID27014994
show ga
OBJECTIVE: Systemic juvenile idiopathic arthritis (JIA) is an inflammatory
disease of childhood in which cells of the monomyelocytoid lineage are thought to
be key effector cells. Monocytes from patients with systemic JIA have a distinct
phenotype, with features of both M1 and M2 alternative activation. MicroRNAs are
critical regulators of monocyte polarization and function, but cellular microRNAs
in systemic JIA have not been examined systematically. METHODS: MicroRNA TaqMan
arrays were used to determine the expression profiles of monocytes from children
with systemic JIA. Expression of microRNA-125a-5p (miR-125a-5p) and its
contribution to monocyte polarization were examined using in vitro-polarized
THP-1 cells and primary human monocytes. RESULTS: A total of 110 microRNAs were
found to be differentially expressed in monocytes from patients with active
systemic JIA, including molecules implicated in rheumatoid arthritis
pathogenesis, cytokine production, and monocyte polarization. MicroRNA-125a-5p
was identified as being highly up-regulated in monocytes from children with
active systemic JIA, as compared to those from children with clinically inactive
JIA or those with active polyarticular JIA, and correlated with systemic features
of the disease. In vitro, monocyte miR125a-5p expression was increased after
polarization under M2b or M2c conditions. Inhibition of miR-125a-5p showed that
this microRNA contributed to full polarization of M2b regulatory macrophages. In
contrast, miR-125a-5p overexpression enhanced M2b polarization and altered other
polarized populations, including increasing the production of M2 markers. Indeed,
in vitro overexpression of this microRNA altered the macrophage phenotype toward
that observed in systemic JIA. CONCLUSION: Children with active systemic JIA have
profound alterations in the expression of microRNAs that are implicated in
monocyte function and polarization. One of these microRNAs, miR-125a-5p, is also
a regulator of immunoregulatory M2b macrophages.