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The complex TIE between macrophages and angiogenesis.

Charis Du Cheyne1, Hanna Tay1, Ward De Spiegelaere1

  • 1Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.

Anatomia, Histologia, Embryologia
|November 28, 2019
PubMed
Summary

Macrophages are key immune cells influencing blood vessel formation (angiogenesis) throughout its stages. Understanding their plasticity, especially TIE2-expressing macrophages, is crucial for developing new pro- or anti-angiogenic therapies.

Keywords:
ANGPT-TIE pathwayTIE2-signallingangiogenesismacrophages

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Area of Science:

  • Immunology
  • Vascular Biology
  • Cell Biology

Background:

  • Macrophages are immune cells with diverse functions beyond phagocytosis, including roles in tissue development and repair.
  • Angiogenesis, the formation of new blood vessels, is a complex process vital for development, wound healing, and disease.
  • Macrophages are increasingly recognized for their significant contributions to various stages of angiogenesis.

Purpose of the Study:

  • To review the multifaceted roles of macrophages in the angiogenic cascade.
  • To highlight the importance of understanding macrophage functional plasticity in angiogenesis.
  • To discuss TIE2-expressing macrophages (TEMs) as key players in promoting angiogenesis.

Main Methods:

  • Literature review of recent research on macrophages and angiogenesis.
  • Analysis of the mechanisms controlling macrophage plasticity during angiogenesis.
  • Focus on the angiopoietin-TIE pathway involving TEMs.

Main Results:

  • Macrophages influence every step of angiogenesis, from sprouting to vessel maturation.
  • Macrophage plasticity is critical for regulating angiogenic processes.
  • TIE2-expressing macrophages (TEMs) are a specific subtype that significantly promotes angiogenesis via the angiopoietin-TIE pathway.

Conclusions:

  • Macrophages are essential regulators of angiogenesis and represent promising therapeutic targets.
  • Targeting macrophages for pro- or anti-angiogenic treatments requires a deep understanding of their dynamic functions.
  • Further research into TEMs and their signaling pathways can unlock new therapeutic strategies for angiogenesis-related conditions.