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2017 ; 56
(6
): 1025-1030
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Monocyte Siglec-14 expression is upregulated in patients with systemic lupus
erythematosus and correlates with lupus disease activity
#MMPMID28137763
Thornhill SI
; Mak A
; Lee B
; Lee HY
; Poidinger M
; Connolly JE
; Fairhurst AM
Rheumatology (Oxford)
2017[Jun]; 56
(6
): 1025-1030
PMID28137763
show ga
OBJECTIVE: Siglecs are sialic acid-binding immunoglobulin-like lectins expressed
on the surface of immune cells, which participate in the discrimination of self
and non-self. We investigated myeloid CD33-related Siglec expression in a cohort
of patients with SLE. METHODS: Cell surface expression of Siglec-5/14, Siglec-9
and Siglec-10 on peripheral myeloid subsets were analysed from 39 SLE patients
using flow cytometry. Genotyping of the Siglec-5/14 locus was also performed.
Clinical markers of SLE disease activity, including SLEDAI, serum complement
concentrations and serum autoantibodies, were assessed and correlated with Siglec
levels. RESULTS: Siglec-14 expression on SLE monocytes (median = 518,
interquartile range: 411) was significantly higher when compared with healthy
controls (median = 427, interquartile range: 289.3; P < 0.05) and correlated
positively with SLEDAI scoring and anti-Sm and anti-SSB autoantibodies (P <
0.05). A negative correlation was determined with patient serum C3 concentrations
(P < 0.005). Genotyping of the Siglec-5/14 locus revealed a high frequency of the
Siglec-14 null allele across both groups, reflecting the incidence in Asian
populations. CONCLUSION: Our data suggest that the Siglec immunomodulatory
molecules, in particular Siglec-14 expression on monocytes, may play an important
role in the inflammatory events of SLE. No bias was found with regard to SIGLEC14
genotype in our patient group compared with healthy controls. Larger comparisons
of mixed ethnicity might, however, reveal an important role for Siglecs in the
pathogenesis of autoimmune disease.