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Macrophage accumulation at a site of renal inflammation is dependent on the M-CSF/c-fms pathway

Yannick Le Meur1, Gregory H Tesch, Prudence A Hill

  • 1Department of Nephrology, Monash Medical Centre, Clayton, Victoria, Australia.

Journal of Leukocyte Biology
|September 12, 2002
PubMed

Insights

Macrophage-colony stimulating factor (M-CSF) signaling via its receptor c-fms is crucial for macrophage accumulation during tissue injury. Blocking this pathway significantly reduces macrophage buildup and proliferation at injury sites.

Area of Science:

  • Immunology
  • Cell Biology
  • Renal Pathology

Background:

  • Macrophage-colony stimulating factor (M-CSF) is a key growth factor for macrophages.
  • M-CSF levels increase in tissues during inflammatory conditions.
  • Macrophage accumulation is a hallmark of tissue injury and inflammation.

Purpose of the Study:

  • To investigate the role of the M-CSF/c-fms pathway in macrophage accumulation at sites of renal tissue injury.
  • To determine if blocking c-fms signaling affects macrophage recruitment, proliferation, and survival during unilateral ureteric obstruction (UUO).

Main Methods:

  • Mice with UUO-induced renal inflammation were treated daily with anti-c-fms antibody or control antibody.
  • Macrophage accumulation, proliferation, and apoptosis were assessed at various time points post-UUO.
  • M-CSF mRNA levels and lymphocytic infiltration were analyzed.

Main Results:

  • UUO led to increased M-CSF mRNA, macrophage accumulation, and proliferation in kidneys.
  • Anti-c-fms treatment significantly inhibited macrophage accumulation (75% reduction at day 10) and local proliferation (90% reduction).
  • Monocyte recruitment was slightly inhibited early on, but blood monocyte counts and lymphocytic infiltration were unaffected.

Conclusions:

  • The M-CSF/c-fms signaling pathway is essential for driving macrophage accumulation during renal tissue injury.
  • Targeting the M-CSF/c-fms axis represents a potential therapeutic strategy to control inflammatory macrophage responses.

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