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Open Access Research article

Semaphorin 3A is a marker for disease activity and a potential immunoregulator in systemic lupus erythematosus

Zahava Vadasz1, Tharwat Haj1, Katalin Halasz1, Itzhak Rosner2, Gleb Slobodin2, Dina Attias3, Aharon Kessel1, Ofra Kessler4, Gera Neufeld4 and Elias Toubi1*

Author affiliations

1 Division of Allergy and Clinical Immunology, Bnai-Zion Medical Center, Rappaport Faculty of Medicine. Technion, Haifa-31048, Israel

2 Division of Rheumatology, Bnai-Zion Medical Center, Rappaport Faculty of Medicine. Technion, Haifa-31048, Israel

3 Division of Haematology, Bnai-Zion Medical Center, Rappaport Faculty of Medicine. Technion, Haifa-31048, Israel

4 The Cancer and Vascular Research Biology Center, Rappaport Faculty of Medicine. Technion, Haifa-31096, Israel

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Citation and License

Arthritis Research & Therapy 2012, 14:R146  doi:10.1186/ar3881

Published: 14 June 2012

Abstract

Introduction

Semaphorin 3A (sema3A) and neuropilin-1 (NP-1) play a regulatory role in immune responses and have a demonstrated effect on the course of collagen induced arthritis. This study was undertaken to evaluate the role of sema3A and NP-1 in the pathogenesis of systemic lupus erythematosus (SLE) and the specific effect of sema3A on the auto-reactive properties of B cells in SLE patients.

Methods

Thirty two SLE and 24 rheumatoid arthritis (RA) patients were assessed and compared with 40 normal individuals. Sema3A serum levels were measured and correlated with SLE disease activity. The in vitro effect of sema3A in reducing Toll-like receptor 9 (TLR-9) expression in B cells of SLE patients was evaluated.

Results

Sema3A serum levels in SLE patients were found to be significantly lower than in RA patients (55.04 ± 16.30 ng/ml versus 65.54 ± 14.82 ng/ml, P = 0.018) and lower yet than in normal individuals (55.04 ± 16.30 ng/ml versus 74.41 ± 17.60 ng/ml, P < 0.0001). Altered serum sema3A levels were found to be in inverse correlation with SLE disease activity, mainly with renal damage. The expression of both sema3A and NP-1 on B cells from SLE patients was significantly different in comparison with normal healthy individuals. Finally, when sema3A was co-cultured with cytosine-phosphodiester-guanine oligodeoxynucleotides (CpG-ODN)-stimulated B cells of SLE patients, their TLR-9 expression was significantly reduced, by almost 50% (P = 0.001).

Conclusions

This is the first study in which a reduced serum level of sema3A was found in association with SLE disease activity. It also raises the possibility that sema3A may have a regulatory function in SLE.