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Macrophage stimulating protein may promote tubular regeneration after acute injury

Vincenzo Cantaluppi1, Luigi Biancone, Giuseppe Mauriello Romanazzi

  • 1Research Center for Experimental Medicine, Department of Internal Medicine, University of Torino, Torino, Italy.

Journal of the American Society of Nephrology : JASN
|July 11, 2008
PubMed

Insights

Macrophage-stimulating protein (MSP) aids kidney tubule regeneration after injury. This protein, elevated in acute kidney injury patients, promotes cell repair and survival.

Area of Science:

  • Nephrology
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Macrophage-stimulating protein (MSP) exhibits proliferative and antiapoptotic properties.
  • These effects suggest a potential role for MSP in tubular regeneration following acute kidney injury (AKI).

Purpose of the Study:

  • To investigate the role of MSP in tubular regeneration after acute kidney injury.
  • To determine MSP levels and its receptor (RON) expression in AKI and renal transplantation.
  • To elucidate the in vitro effects of MSP on tubular epithelial cells.

Main Methods:

  • Measured plasma MSP levels in critically ill patients with acute renal failure and renal allograft recipients.
  • Assessed MSP and RON expression in a mouse model of glycerol-induced tubular injury.
  • Utilized in vitro assays to evaluate MSP's effects on tubular epithelial cell proliferation, apoptosis, migration, and differentiation.

Main Results:

  • Elevated plasma MSP levels were observed in patients with acute renal failure and post-renal transplantation.
  • MSP and RON were significantly upregulated during tubular regeneration in mice after injury.
  • In vitro, MSP promoted tubular cell proliferation, inhibited apoptosis, enhanced migration, and induced tubulogenesis and mesenchymal de-differentiation, including Pax-2 expression.

Conclusions:

  • MSP is upregulated in the context of injured tubular cell regeneration.
  • MSP demonstrates multifaceted biological effects that support the recovery process after acute kidney injury.
  • These findings highlight MSP as a potential therapeutic target for promoting renal recovery.

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