Anti-myeloperoxidase antibodies attenuate the monocyte response to LPS and shape macrophage development

Research output: Contribution to journalArticle


  • Reena J Popat
  • Seran Hakki
  • Alice M Coughlan
  • Julie Watson
  • Mark A Little
  • Corinne M Spickett
  • Paul Lavender
  • Behdad Afzali
  • Claudia Kemper
  • Michael G Robson

Colleges, School and Institutes

External organisations

  • Division of Transplant Immunology and Mucosal Biology, MRC Centre for Transplantation, King's College London, Guy's Hospital, Great Maze Pond, London, United Kingdom.
  • Aston University
  • Trinity Health Kidney Centre, Department of Clinical Medicine, Trinity College Dublin, St. James' Hospital Campus, Dublin, Ireland.
  • King's College London


Anti-neutrophil cytoplasmic antibody (ANCA) vasculitis is characterized by the presence of autoantibodies to myeloperoxidase and proteinase-3, which bind monocytes in addition to neutrophils. While a pathological effect on neutrophils is acknowledged, the impact of ANCA on monocyte function is less well understood. Using IgG from patients we investigated the effect of these autoantibodies on monocytes and found that anti-myeloperoxidase antibodies (MPO-ANCA) reduced both IL-10 and IL-6 secretion in response to LPS. This reduction in IL-10 and IL-6 depended on Fc receptors and enzymatic myeloperoxidase and was accompanied by a significant reduction in TLR-driven signaling pathways. Aligning with changes in TLR signals, oxidized phospholipids, which function as TLR4 antagonists, were increased in monocytes in the presence of MPO-ANCA. We further observed that MPO-ANCA increased monocyte survival and differentiation to macrophages by stimulating CSF-1 production. However, this was independent of myeloperoxidase enzymatic activity and TLR signaling. Macrophages differentiated in the presence of MPO-ANCA secreted more TGF-β and further promoted the development of IL-10- and TGF-β-secreting CD4+ T cells. Thus, MPO-ANCA may promote inflammation by reducing the secretion of antiinflammatory IL-10 from monocytes, and MPO-ANCA can alter the development of macrophages and T cells to potentially promote fibrosis.


Original languageEnglish
Article numbere87379
JournalJCI Insight
Issue number2
Publication statusPublished - 26 Jan 2017