An investigation of the inflammatory cytokine and chemokine network in systemic sclerosis

Codullo, V. et al. (2011) An investigation of the inflammatory cytokine and chemokine network in systemic sclerosis. Annals of the Rheumatic Diseases, 70(6), pp. 1115-1121. (doi:10.1136/ard.2010.137349) (PMID:21285114)

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Abstract

Objectives Systemic sclerosis (SSc) is characterised by vasculopathy, an aberrantly activated immune system and excessive extracellular matrix deposition. Inflammatory chemokines control migration of cells to sites of tissue damage; their removal from inflamed sites is essential for resolution of the inflammatory response. The atypical chemokine receptor D6 has a critical role in this physiological balance. To explore potential deregulation of this system in SSc, inflammatory chemokine and D6 expression were compared with that in healthy controls (HC).

Methods Serum levels of inflammatory mediators were assessed by luminex analysis. Peripheral blood mononuclear cells (PBMCs) were used in molecular and immunocytochemical analysis. Platelet-rich plasma was collected and assessed by western blotting for D6 expression levels. Sex-matched HC were used for comparison.

Results 72 patients with SSc and 30 HC were enrolled in the study. The chemokines MCP-1/CCL2, MIP-1α/CCL3, MIP-1β/CCL4 and IL-8/CXCL8 were significantly increased in patients with SSc, regardless of disease subtype and phase. Quantitative PCR analysis revealed a significant 10-fold upregulation of D6 transcripts in patients with SSc compared with controls, and this was paralleled by increased D6 protein expression in the PBMCs of patients with SSc. Platelet lysates also showed strong D6 expression in patients with SSc but not in controls. Importantly, high levels of D6 expression correlated with reduced levels of its ligands in serum.

Conclusions Inflammatory chemokines and the regulatory receptor D6 are significantly upregulated in SSc and high D6 levels are associated with lower systemic chemokine levels, indicating that some patients control systemic chemokine levels using D6. These results suggest that chemokines may represent a therapeutic target in SSc.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McInnes, Professor Iain and Fraser, Dr Alasdair and Singh, Mr Mark and Hueber, Dr Axel and Codullo, Dr Veronica and Gilmour, Miss Ashley and Graham, Professor Gerard
Authors: Codullo, V., Baldwin, H. M., Singh, M. D., Fraser, A. R., Gilmour, A., Hueber, A. J., Bonino, C., McInnes, I. B., Montecucco, C., Graham, G. J., and Wilson, C.
College/School:College of Medical Veterinary and Life Sciences
College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Annals of the Rheumatic Diseases
Publisher:BMJ Publishing Group
ISSN:0003-4967
ISSN (Online):1468-2060
Published Online:01 February 2011

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
514422Regulation of the adaptive immune response by chemokine scavenging receptorsGerard GrahamMedical Research Council (MRC)G0901113Infection Immunity and Inflammation Medicine