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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Rheumatoid arthritis (RA) involves bone erosion driven by osteoclasts (OCs).
  • Immature dendritic cells (DCs) can differentiate into OCs, but the mechanisms are unclear.
  • Protein citrullination and anti-citrullinated protein antibodies (ACPAs) are key in RA pathogenesis.

Purpose of the Study:

  • To investigate if protein citrullination and ACPAs regulate DC-OC transdifferentiation.
  • To understand the role of peptidyl arginine deiminase (PAD) activity in this process.

Main Methods:

  • Assessed PAD activity and protein citrullination in DCs.
  • Detected citrullinated proteins (actin, vimentin) on DCs and DC-derived OCs.
  • Investigated ACPA binding and IL-8 release.
  • Blocked IL-8 and PAD enzymes to assess effects on differentiation.

Main Results:

  • DC plasticity toward OCs correlated with PAD activity and citrullination.
  • Citrullinated actin and vimentin were found on DCs and OCs, binding ACPAs.
  • ACPAs enhanced OC differentiation via IL-8 release.
  • Blocking IL-8 or PAD abolished ACPA-induced differentiation; PAD inhibition reduced basal OC development.

Conclusions:

  • Protein citrullination and ACPA binding promote DC-OC transdifferentiation.
  • This plasticity may facilitate bone erosion in ACPA-positive RA.
  • PAD enzymes play a critical role in DC-OC transdifferentiation.