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The MIF receptor CD74 in diabetic podocyte injury

Maria Dolores Sanchez-Niño1, Ana Belen Sanz, Pekka Ihalmo

  • 1Fundacion Jimenez Diaz, Universidad Autonoma de Madrid, Fundación Renal Iñigo Alvarez de Toledo, Madrid, Spain.

Journal of the American Society of Nephrology : JASN
|October 10, 2008
PubMed

Insights

Macrophage migration inhibitory factor (MIF) receptor CD74 is elevated in diabetic nephropathy. CD74 in podocytes may mediate MIF

Area of Science:

  • Nephrology
  • Immunology
  • Endocrinology

Background:

  • Metabolic derangement is central to diabetic nephropathy.
  • Macrophage migration inhibitory factor (MIF) and its receptor CD74 are implicated in diabetic nephropathy.
  • The role of CD74 in podocyte signaling in diabetic nephropathy is unclear.

Purpose of the Study:

  • To investigate the role of CD74 as a MIF receptor in podocytes in diabetic nephropathy.
  • To examine CD74 expression and activation in diabetic nephropathy.

Main Methods:

  • Assessed CD74 mRNA and protein expression in human diabetic nephropathy samples and experimental models.
  • Utilized immunohistochemistry to localize CD74 in glomeruli.
  • Cultured human podocytes and proximal tubule cells (HK2) were treated with high glucose, TNF-alpha, and MIF.
  • Analyzed downstream signaling pathways including ERK1/2 and p38 phosphorylation.
  • Measured inflammatory mediator expression (TRAIL, MCP-1).

Main Results:

  • CD74 mRNA and protein expression were increased in glomeruli and tubules in diabetic nephropathy.
  • Glomerular CD74 was localized to podocytes.
  • High glucose and TNF-alpha upregulated cell surface CD74 in podocytes.
  • MIF activated CD74 in podocytes, leading to ERK1/2 and p38 phosphorylation.
  • MIF induced inflammatory mediator expression (TRAIL, MCP-1) in podocytes and HK2 cells via p38-dependent pathways.

Conclusions:

  • CD74 functions as a MIF receptor in podocytes.
  • CD74 signaling in podocytes contributes to inflammation and injury in diabetic nephropathy.
  • Targeting the MIF-CD74 pathway may offer therapeutic strategies for diabetic nephropathy.

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