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2015 ; 10
(9
): e0137385
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English Wikipedia
Constitutive STAT3 Phosphorylation in Circulating CD4+ T Lymphocytes Associates
with Disease Activity and Treatment Response in Recent-Onset Rheumatoid
Arthritis
#MMPMID26353115
Kuuliala K
; Kuuliala A
; Koivuniemi R
; Oksanen S
; Hämäläinen M
; Moilanen E
; Kautiainen H
; Leirisalo-Repo M
; Repo H
PLoS One
2015[]; 10
(9
): e0137385
PMID26353115
show ga
The aim of the present study was to examine constitutive signal transducer and
activator of transcription 3 (STAT3) phosphorylation in circulating leukocytes as
a candidate biomarker in rheumatoid arthritis (RA). 25 patients with
recent-onset, untreated RA provided samples for whole blood flow cytometric
determination of intracellular STAT3 phosphorylation, expressed as relative
fluorescence units. The occurrence of constitutive STAT3 phosphorylation was
evaluated by determining proportion of STAT3-phosphorylated cells among different
leukocyte subtypes. Plasma levels of interleukin (IL)-6, IL-17 and IL-21 were
measured by immunoassay, radiographs of hands and feet were examined and disease
activity score (DAS28) was determined. Biomarkers were restudied and treatment
response (according to European League Against Rheumatism) was determined after
12 months of treatment with disease-modifying antirheumatic drugs. At baseline,
constitutive phosphorylation of STAT3 occurred in CD4+ T cells of 14 (56%)
patients, CD8+ T cells of 13 (52%) patients, in CD19+ B cells of 7 (28%)
patients, and in CD14+ monocytes of 12 (48%) patients. STAT3 phosphorylation
levels of CD4+ T cells associated with DAS28, and those of all leukocyte subtypes
studied associated with erosive disease. The presence of constitutive STAT3
phosphorylation in CD4+ T lymphocytes, pSTAT3 fluorescence intensity of CD4+ and
CD8+ T cells and C-reactive protein (CRP) levels at baseline associated with good
treatment response. In conclusion, constitutive STAT3 phosphorylation in
circulating CD4+ T cells is common in recent-onset untreated RA and associates
with good treatment response in patients characterized by high disease activity
and the presence of systemic inflammation.