Decreased CXCR1 and CXCR2 expression on neutrophils in anti-neutrophil cytoplasmic autoantibody-associated vasculitides potentially increases neutrophil adhesion and impairs migration

Nan Hu, Johanna Westra, Abraham Rutgers, Berber Doornbos-Van der Meer, Minke G Huitema, Coen A Stegeman, Wayel H Abdulahad, Simon C Satchell, Peter W Mathieson, Peter Heeringa, Cees G M Kallenberg

Research output: Contribution to journalArticle (Academic Journal)peer-review

34 Citations (Scopus)

Abstract

INTRODUCTION: In anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitides (AAV), persistent inflammation within the vessel wall suggests perturbed neutrophil trafficking leading to accumulation of activated neutrophils in the microvascular compartment. CXCR1 and CXCR2, being major chemokine receptors on neutrophils, are largely responsible for neutrophil recruitment. We speculate that down-regulated expression of CXCR1/2 retains neutrophils within the vessel wall and, consequently, leads to vessel damage.

METHODS: Membrane expression of CXCR1/2 on neutrophils was assessed by flow cytometry. Serum levels of interleukin-8 (IL-8), tumor necrosis factor alpha (TNF-α), angiopoietin 1 and angiopoietin 2 from quiescent and active AAV patients and healthy controls (HC) were quantified by ELISA. Adhesion and transendothelial migration of isolated neutrophils were analyzed using adhesion assays and Transwell systems, respectively.

RESULTS: Expression of CXCR1 and CXCR2 on neutrophils was significantly decreased in AAV patients compared to HC. Levels of IL-8, which, as TNFα, dose-dependently down-regulated CXCR1 and CXCR2 expression on neutrophils in vitro, were significantly increased in the serum of patients with active AAV and correlated negatively with CXCR1/CXCR2 expression on neutrophils, even in quiescent patients. Blocking CXCR1 and CXCR2 with repertaxin increased neutrophil adhesion and inhibited migration through a glomerular endothelial cell layer.

CONCLUSIONS: Expression of CXCR1 and CXCR2 is decreased in AAV, potentially induced by circulating proinflammatory cytokines such as IL-8. Down-regulation of these chemokine receptors could increase neutrophil adhesion and impair its migration through the glomerular endothelium, contributing to neutrophil accumulation and, in concert with ANCA, persistent inflammation within the vessel wall.

Translated title of the contributionDecreased CXCR1 and CXCR2 expression on neutrophils in anti-neutrophil cytoplasmic autoantibody-associated vasculitides potentially increases neutrophil adhesion and impairs migration
Original languageEnglish
Pages (from-to)R201
Number of pages1
JournalArthritis Research and Therapy
Volume13
Issue number6
DOIs
Publication statusPublished - Dec 2011

Keywords

  • Adult
  • Aged
  • Aged, 80 and over
  • Antibodies, Antineutrophil Cytoplasmic
  • Cell Adhesion
  • Cell Line
  • Cell Membrane
  • Cell Movement
  • Cells, Cultured
  • Dose-Response Relationship, Drug
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Flow Cytometry
  • Humans
  • Interleukin-8
  • Male
  • Middle Aged
  • Neutrophils
  • Receptors, Interleukin-8A
  • Receptors, Interleukin-8B
  • Tumor Necrosis Factor-alpha
  • Vasculitis

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  • CELLULAR BASIS OF ALBUMINURIA

    Mathieson, P. W.

    1/11/081/05/12

    Project: Research

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