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2015 ; 10
(9
): e0137474
Nephropedia Template TP
gab.com Text
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English Wikipedia
Elevated Membrane and Soluble CD64: A Novel Marker Reflecting Altered Fc?R
Function and Disease in Early Rheumatoid Arthritis That Can Be Regulated by
Anti-Rheumatic Treatment
#MMPMID26406605
Matt P
; Lindqvist U
; Kleinau S
PLoS One
2015[]; 10
(9
): e0137474
PMID26406605
show ga
OBJECTIVES: Fc receptors (FcR) interacting with immune complexes (ICs) is a
central event in the immune pathogenesis of rheumatoid arthritis (RA). Here we
asked if a specific FcR is linked to RA pathogenesis and if FcR activities relate
to disease and treatment outcome in early RA. MATERIAL AND METHODS: Twenty
autoantibody-positive RA patients and 33 HC were included. The patients were
evaluated before and after treatment with methotrexate and prednisolone. At
follow-up, the EULAR response criteria were applied to determine the individual
treatment outcomes. Serum immunoglobulin levels were measured and the expression
of FcR for IgG (Fc?R) and IgA (Fc?R) on peripheral blood monocytes were
determined by flow cytometry. The monocytic Fc?R function was evaluated by human
IgG1 and IgG3 IC-binding and TNF? stimulated release. Plasma levels of soluble
FcRs (sFcRs) were determined with ELISA. RESULTS: The IgG1 and IgG3 levels were
elevated in the RA sera. The RA monocytes expressed more CD64 and cell
surface-bound IgG than HC monocytes, and showed an impaired Fc?R function as
reflected by changes in IC-binding and decreased IC-stimulated TNF? secretion.
These findings correlated significantly with different disease activity markers.
Furthermore, sFcRs were elevated in the patient plasma, and sCD64 was specific
for RA (compared with a reference group of patients with active psoriatic
arthritis). Following treatment, immunoglobulins and sFcR levels were reduced,
whereas membrane CD64 was only decreased in patients with good response to
treatment. CONCLUSIONS: Early RA patients display increased membrane and soluble
CD64 and an impaired Fc?R function correlating with joint disease activity.
Beneficial responses of anti-rheumatic treatment in patients reduce CD64. These
data suggest sCD64 as an important objective biomarker in RA.