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Macrophage-mediated renal injury is dependent on signaling via the JNK pathway

Yohei Ikezumi1, Lyn Hurst, Robert C Atkins

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

Journal of the American Society of Nephrology : JASN
|June 24, 2004
PubMed

Insights

The Jun amino terminal kinase (JNK) signaling pathway is critical for macrophage-mediated renal injury in glomerulonephritis. Inhibiting JNK significantly reduced proteinuria and glomerular cell proliferation in a rat model.

Area of Science:

  • Nephrology
  • Immunology
  • Cell Signaling

Background:

  • Macrophage accumulation is a hallmark of glomerulonephritis and linked to kidney dysfunction.
  • The precise mechanisms of macrophage activation driving renal injury remain unclear.

Purpose of the Study:

  • To investigate the necessity of the Jun amino terminal kinase (JNK) signaling pathway in macrophage-mediated renal injury.

Main Methods:

  • An adoptive transfer model using rats immunized with sheep IgG and treated with cyclophosphamide (CyPh) and anti-glomerular basement membrane (GBM) serum.
  • Bone marrow-derived macrophages (BMM) were transferred, with some pre-treated with a JNK inhibitor (SP600125).
  • Proteinuria and glomerular cell proliferation (PCNA+ cells) were assessed.

Main Results:

  • Macrophage transfer was essential for proteinuria and proliferation in CyPh-treated anti-GBM disease.
  • JNK inhibition did not affect macrophage accumulation but significantly reduced proteinuria (75%) and glomerular cell proliferation (70%).

Conclusions:

  • The JNK signaling pathway plays a crucial role in mediating renal injury driven by macrophages.
  • Targeting JNK signaling represents a potential therapeutic strategy for glomerulonephritis.

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