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2017 ; 4
(1
): 29-35
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IL-17A levels in systemic lupus erythematosus associated with inflammatory
markers and lower rates of malignancy and heart damage: Evidence for a dual role
#MMPMID28293450
Raymond W
; Ostli-Eilertsen G
; Griffiths S
; Nossent J
Eur J Rheumatol
2017[Mar]; 4
(1
): 29-35
PMID28293450
show ga
OBJECTIVE: The interleukin 17 (IL-17) cytokine family is involved in a number of
chronic inflammatory diseases. In spite of contradictory findings and a lack of
causality in clinical studies, IL-17 inhibition for systemic lupus erythematosus
(SLE) has regained attention as a potential therapeutic pathway, after
demonstrating disease-modifying capabilities in ankylosing spondylitis. We
investigated the clinical associations of interleukin 17 A (IL-17A) in patients
with SLE. MATERIAL AND METHODS: A cross-sectional study was performed involving
SLE patients (n=102; age: 49 years; 86% female) recruited from a regional
registry. IL-17A levels were determined by immunoassay, disease activity by
Systemic Lupus Erythematosus Disease Activity Index-2K (SLEDAI-2K), and
cumulative damage by Systemic Lupus International Collaborative Clinics Damage
Index (SDI) scores. Non-parametric techniques were used to examine the
association between IL-17A and disease activity and autoantibody profiles were
compared with healthy controls (n=31): principal component analysis (PCA) was
used to determine the interplay of immune cells across disease states and damage
development in SLE patients. RESULTS: SLE patients had higher IgG levels, lower
T-cell and B-cell counts, but median IL-17A levels did not differ from the
controls (28.4 vs. 28.4 pg/mL, p=0.9). In SLE patients, IL-17A did not correlate
with SLEDAI-2K or SDI, but was inversely related with age (correlation
coefficients, Rs.=-0.29, p<0.05), systolic blood pressure (Rs.=-0.31, p<0.05),
years of smoking (Rs.=-0.43, p<0.05), cumulative heart (Rs.=-0.22, p<0.05), and
malignancy damage (Rs.=-0.18, p<0.05). Serological correlations for IL-17A
existed with immunoglobulin G (IgG) levels (Rs.=0.21, p<0.05), high sensitivity
C-reactive protein (hs-CRP) levels (Rs.=0.28, p<0.05), proteinuria (Rs.=0.64,
p<0.05), and pre-albumin (Rs.=-0.22, p<0.05). Longitudinal data showed only
modest fluctuation in IL-17A levels, independent of SLEDAI-2K. CONCLUSION: These
results suggest that IL-17A, while participating in inflammation, may also serve
a protective purpose in SLE patients.