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CSF-1 in Inflammatory and Arthritic Pain Development.

Reem Saleh1, Ming-Chin Lee1, Stella H Khiew1

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Colony-stimulating factor 1 (CSF-1) plays a peripheral role in inflammatory pain. Blocking CSF-1 or its receptor (CSF-1R) can prevent pain and arthritis development, suggesting a potential therapeutic target.

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Area of Science:

  • Immunology
  • Neuroscience
  • Rheumatology

Background:

  • Pain management remains a significant challenge due to inadequate understanding and treatment options for many debilitating diseases.
  • Colony-stimulating factor 1 (CSF-1), also known as macrophage colony-stimulating factor (M-CSF), regulates monocyte/macrophage lineage development and tissue macrophage function.
  • CSF-1 signaling via its receptor (CSF-1R, c-Fms) has been implicated in neuropathic pain through central microglial activation.

Purpose of the Study:

  • To investigate the role of CSF-1 signaling in the development of peripheral inflammatory pain.
  • To evaluate the efficacy of targeting CSF-1 or CSF-1R in preclinical models of inflammatory pain and arthritis.
  • To explore the relationship between CSF-1 and other pro-inflammatory cytokines like TNF and GM-CSF in pain pathogenesis.

Main Methods:

  • Systemic administration of neutralizing monoclonal antibodies (mAbs) against CSF-1R or CSF-1 in mouse models.
  • Induction of inflammatory pain using zymosan, GM-CSF, and TNF.
  • Assessment of pain and arthritis development following systemic CSF-1 administration.

Main Results:

  • Systemic anti-CSF-1R or anti-CSF-1 mAb treatment inhibited the development of inflammatory pain induced by zymosan, GM-CSF, and TNF.
  • This blockade prevented, but did not ameliorate, established arthritic pain and disease, suggesting CSF-1's relevance in acute or periodic inflammatory insults.
  • Systemic CSF-1 administration rapidly induced pain and exacerbated arthritis in inflamed joints, acting through pathways distinct from GM-CSF and TNF.

Conclusions:

  • CSF-1 can act peripherally to generate inflammatory pain and associated diseases, including those involving TNF and GM-CSF.
  • Targeting CSF-1 or CSF-1R presents a potential therapeutic strategy for managing inflammatory pain and related conditions.
  • Findings have implications for the design and selection of clinical trials targeting the CSF-1R/CSF-1 pathway.