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Interleukin-34 Promotes Fibrocyte Proliferation.

Carole L Galligan1, Eleanor N Fish1,2

  • 11 Division of Advanced Diagnostics, Toronto General Hospital Research Institute, University Health Network , Toronto, Canada .

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|October 4, 2017
PubMed
Summary

Interleukin-34 (IL-34) stimulates the proliferation and activation of fibrocytes, a type of stem cell implicated in rheumatoid arthritis (RA). This finding suggests IL-34 contributes to RA onset and systemic disease spread.

Keywords:
IL-34T cell activationfibrocytesrheumatoid arthritis

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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Rheumatoid arthritis (RA) is a systemic autoimmune disease impacting joints.
  • The factors driving RA's systemic spread remain unclear.
  • Fibrocytes, circulating stem cells, are implicated in RA onset and pathogenesis.

Purpose of the Study:

  • To investigate the role of interleukin-34 (IL-34) in rheumatoid arthritis (RA).
  • To explore the association between IL-34 and fibrocyte activity in RA.

Main Methods:

  • Measured IL-34 levels and fibrocyte numbers in RA patients and arthritic mice.
  • Treated fibrocytes with IL-34 in vitro to assess proliferation and activation.
  • Analyzed the role of CSF-R1 signaling in IL-34-mediated fibrocyte responses.

Main Results:

  • Elevated IL-34 levels correlate with RA indicators and radiographic progression.
  • Simultaneous increases in IL-34 and activated fibrocytes were observed in arthritic mice.
  • IL-34 treatment stimulated fibrocyte proliferation and activation in vitro via CSF-R1.

Conclusions:

  • IL-34 promotes fibrocyte proliferation and activation during arthritis.
  • IL-34 may contribute to the onset and systemic spread of rheumatoid arthritis.