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Dendritic cell integrin expression patterns regulate inflammation in the rheumatoid arthritis joint.

Leonie Schittenhelm1,2,3, Jamie Robertson1, Arthur G Pratt2,3,4

  • 1Institute of Infection, Immunity & Inflammation, University of Glasgow, Glasgow, UK.

Rheumatology (Oxford, England)
|October 30, 2020
PubMed
Summary
This summary is machine-generated.

In rheumatoid arthritis (RA) patients, dendritic cells (DCs) show altered CD11a and CD11b integrin expression. CD11b on DCs promotes T cell activation, suggesting these integrins are potential therapeutic targets for RA.

Keywords:
dendritic cellsimmune regulationintegrinsrheumatoid arthritistolerogenic dendritic cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Rheumatology

Background:

  • Immune dysregulation is implicated in rheumatoid arthritis (RA) pathogenesis.
  • Altered expression of integrin adhesion receptors on immune cells, particularly dendritic cells (DCs), may contribute to RA development.
  • Investigating specific integrin subunits like CD11a and CD11b in RA DCs is crucial for understanding disease mechanisms.

Purpose of the Study:

  • To investigate the expression patterns and functional roles of β2 integrin subunits CD11a and CD11b in dendritic cell (DC) subsets from patients with rheumatoid arthritis (RA).
  • To compare integrin expression in DCs from RA patients' peripheral blood (PB) and synovial fluid (SF) with healthy controls.
  • To model and validate findings in vitro using monocyte-derived DCs (moDCs) and assess the impact on T cell activation.

Main Methods:

  • Quantified total and active β2 integrin subunit expression (CD11a, CD11b) in DC subsets from RA patients (PB and SF) and healthy controls (PB).
  • Utilized ex vivo stimulation of PB DC subsets and in vitro-generated mature and tolerogenic moDCs to model clinical observations.
  • Assessed DC function by analyzing clustering and adhesion, and evaluated T cell activation in DC-T cell co-cultures, including experiments with CD11b blockade.

Main Results:

  • DCs in RA synovial fluid exhibited significantly reduced CD11a expression and increased CD11b expression compared to peripheral blood.
  • In vitro models showed that tolerogenic moDCs had higher active CD11a and lower active CD11b compared to mature moDCs.
  • Blocking CD11b function in co-cultures significantly impaired T cell activation, indicating a pro-inflammatory role.

Conclusions:

  • Demonstrated opposing expression of CD11a and CD11b in RA DCs, correlating with inflammatory versus tolerogenic states.
  • Identified a T cell stimulatory role for CD11b on DCs in the context of RA.
  • Highlighted DC-associated integrins CD11a and CD11b as potential novel therapeutic targets for rheumatoid arthritis intervention.