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Published in: Arthritis Research & Therapy 3/2013

Open Access 01-06-2013 | Research article

Increased frequency of circulating IL-21 producing Th-cells in patients with granulomatosis with polyangiitis (GPA)

Authors: Wayel H Abdulahad, Nikola Lepse, Coen A Stegeman, Minke G Huitema, Berber Doornbos-van der Meer, Henko Tadema, Abraham Rutgers, Pieter C Limburg, Cees GM Kallenberg, Peter Heeringa

Published in: Arthritis Research & Therapy | Issue 3/2013

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Abstract

Introduction

The present study aimed to explore a possible role for IL-21 producing Th-cells in the immunopathogenesis of granulomatosis with polyangiitis (GPA).

Methods

Peripheral blood from 42 GPA patients in remission and 29 age-matched healthy controls (HCs) were stimulated in vitro, and the frequencies of IL-21 producing Th-cells were determined by flow cytometry. Since Th17-cells produce a low level of IL-21, IL-17 was also included in the analysis. Given that IL-21 is a hallmark cytokine for T follicular helper cells (TFH), we next evaluated the expression of their key transcription factor BCL-6 by RT-PCR and flow cytometry. To investigate the effect of IL-21 on autoantibody-production, PBMCs from GPA patients were stimulated in vitro with BAFF/IL-21 and total IgG and ANCA levels were measured in supernatants. In addition, the expression of IL-21-receptor on B-cells was analyzed.

Results

Percentages of IL-21 producing Th-cells were significantly elevated in GPA-patients compared to HCs, and were restricted to ANCA-positive patients. The expression of BCL-6 was significantly higher in ANCA-positive GPA-patients, as compared with ANCA-negative patients and HCs. IL-21 enhanced the production of IgG and ANCA in vitro in stimulated PBMCs from GPA patients. No difference was found in the expression of the IL-21-receptor on B-cells between ANCA-negative patients, ANCA-positive patients, and HCs.

Conclusion

The increased frequency of circulating IL-21 producing Th-cells in ANCA-positive GPA patients and the stimulating capacity of IL-21 on ANCA-production suggest a role for these cells in the immunopathogenesis of GPA. Blockade of IL-21 could constitute a new therapeutic strategy for GPA.
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Metadata
Title
Increased frequency of circulating IL-21 producing Th-cells in patients with granulomatosis with polyangiitis (GPA)
Authors
Wayel H Abdulahad
Nikola Lepse
Coen A Stegeman
Minke G Huitema
Berber Doornbos-van der Meer
Henko Tadema
Abraham Rutgers
Pieter C Limburg
Cees GM Kallenberg
Peter Heeringa
Publication date
01-06-2013
Publisher
BioMed Central
Published in
Arthritis Research & Therapy / Issue 3/2013
Electronic ISSN: 1478-6362
DOI
https://doi.org/10.1186/ar4247

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