Thymic Stromal Lymphopoietin is Up-regulated in the Skin of Patients with Systemic Sclerosis and Induces Profibrotic Genes and Intracellular Signaling That Overlap with Those Induced by Interleukin-13 and Transforming Growth Factor β

Overview

Journal Arthritis Rheum

Specialty Rheumatology

Date 2013 Jan 22

PMID 23335246

Citations 23

Authors

Romy B Christmann

Allison Mathes

Alsya J Affandi

Cristina Padilla

Banafsheh Nazari

Andreea M Bujor

Giuseppina Stifano

Robert Lafyatis

Affiliations

Soon will be listed here.

Abstract

Objective: To explore the expression of thymic stromal lymphopoietin (TSLP) in patients with diffuse cutaneous systemic sclerosis (dcSSc) and compare its effects in vivo and in vitro with those of interleukin-13 (IL-13) and transforming growth factor β (TGFβ).

Methods: Skin biopsy specimens from patients with dcSSc (n = 14) and healthy controls (n = 13) were analyzed by immunohistochemistry and immunofluorescence for TSLP, TSLP receptor, CD4, CD8, CD31, and CD163 markers. Wild-type, IL-4Rα1-, and TSLP-deficient mice were treated with TGFβ, IL-13, poly(I-C), or TSLP by osmotic pump. Human fibroblasts and peripheral blood mononuclear cells (PBMCs) were stimulated with TGFβ, IL-13, poly(I-C), or TSLP. Microarray analysis and quantitative polymerase chain reaction were performed to determine gene expression, and protein levels of phospho-Smad2 and macrophage marker CD163 were tested.

Results: TSLP was highly expressed in the skin of dcSSc patients, more strongly in perivascular areas and in immune cells, and was produced mainly by CD163+ cells. The skin of TSLP-treated mice showed up-regulated clusters of gene expression that overlapped strongly with those in IL-13- and TGFβ-treated mice. TSLP up-regulated specific genes, including CXCL9, proteasome, and interferon (IFN)-regulated genes. TSLP treatment in IL-4Rα1-deficient mice promoted similar cutaneous inflammation as in wild-type mice, though TSLP-induced arginase 1, CCL2, and matrix metalloproteinase 12 messenger RNA levels were blocked. In PBMCs, TSLP up-regulated tumor necrosis factor α, Mx-1, IFNγ, CXCL9, and mannose receptor 1 gene expression. TSLP-deficient mice treated with TGFβ showed less fibrosis and blocked expression of plasminogen activator inhibitor 1 and osteopontin 1. Poly(I-C)-treated mice showed high levels of cutaneous TSLP.

Conclusion: TSLP is highly expressed in the skin of dcSSc patients and interacts in a complex manner with 2 other profibrotic cytokines, TGFβ and IL-13, strongly suggesting that it might promote SSc fibrosis directly or indirectly by synergistically stimulating profibrotic genes, or production of these cytokines.

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