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Macrophage-stimulating protein and RON receptor tyrosine kinase: potential regulators of macrophage inflammatory

M-H Wang1, Y-Q Zhou, Y-Q Chen

  • 1Department of Medicine and Immunology, University of Colorado Health Sciences Center and Denver Health Medical Center, Denver, CO, USA. ming-hai.wang@uchsc.edu

Scandinavian Journal of Immunology
|December 11, 2002
PubMed

Insights

Macrophage-stimulating protein (MSP) and its receptor RON regulate macrophage responses. RON activation by MSP promotes macrophage functions but suppresses inflammation, crucial for controlling bacterial infections.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Macrophage-stimulating protein (MSP) is a serum protein.
  • MSP binds to the RON receptor tyrosine kinase, a MET proto-oncogene family member.

Purpose of the Study:

  • To investigate the dual functions of MSP-RON signaling in macrophages.
  • To elucidate the role of MSP-RON in regulating inflammatory responses and bacterial infection.

Main Methods:

  • Investigated macrophage activation and inflammatory mediator production.
  • Utilized in vivo studies involving gene inactivation.

Main Results:

  • MSP-RON signaling stimulates macrophage spreading, migration, and phagocytosis.
  • MSP-RON signaling inhibits lipopolysaccharide (LPS)-induced inflammatory mediator production by blocking NF-kappaB pathways.
  • RON gene inactivation in mice led to heightened inflammatory responses and increased susceptibility to septic death.

Conclusions:

  • MSP and RON are key regulators of macrophage activity.
  • The MSP-RON pathway plays a critical role in attenuating inflammatory responses during bacterial infection in vivo.

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