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2017 ; 4
(1
): e000225
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Osteopontin is associated with disease severity and antiphospholipid syndrome in
well characterised Swedish cases of SLE
#MMPMID29188073
Wirestam L
; Frodlund M
; Enocsson H
; Skogh T
; Wetterö J
; Sjöwall C
Lupus Sci Med
2017[]; 4
(1
): e000225
PMID29188073
show ga
OBJECTIVE: The variety of disease phenotypes among patients with SLE challenges
the identification of new biomarkers reflecting disease activity and/or organ
damage. Osteopontin (OPN) is an extracellular matrix protein with
immunomodulating properties. Although raised levels have been reported, the
pathogenic implications and clinical utility of OPN as a biomarker in SLE are far
from clear. Thus, the aim of this study was to characterise OPN in SLE. METHODS:
Sera from 240 well-characterised adult SLE cases classified according to the
American College of Rheumatology (ACR) and/or the Systemic Lupus International
Collaborating Clinics (SLICC) criteria, and 240 population-based controls were
immunoassayed for OPN. The SLE Disease Activity Index 2000 (SLEDAI-2K) was used
to evaluate disease activity and the SLICC/ACR Damage Index (SDI) to detect
damage accrual. RESULTS: Serum OPN levels were in average raised fourfold in SLE
cases compared with the controls (p<0.0001). OPN correlated with SLEDAI-2K,
especially in patients with a disease duration of <12 months (r=0.666, p=0.028).
OPN was highly associated with SDI (p<0.0001), especially in the renal
(p<0.0001), cardiovascular (p<0.0001) and malignancy (p=0.012) domains. Finally,
OPN associated with coherent antiphospholipid syndrome (APS; p=0.009), and both
clinical and laboratory criteria of APS had significant positive impact on OPN
levels. CONCLUSIONS: In this cross-sectional study, circulating OPN correlates
with disease activity in recent-onset SLE, reflects global organ damage and
associates with APS. Longitudinal studies to dissect whether serum OPN also
precedes and predicts future organ damage are most warranted.