Contribution of monocytes/macrophages to compensatory neovascularization: The drilling of metalloelastase-positive tunnels in ischemic myocardium

Nicanor I. Moldovan, Pascal Goldschmidt-Clermont, Jan Parker-Thornburg, Steven D. Shapiro, Pappachan E. Kolattukudy

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210 Scopus citations

Abstract

In a transgenic model of ischemic cardiomyopathy in which monocytes are attracted to the myocardium by the targeted overexpression of monocyte chemoattractant protein-1 (MCP-1), we have observed the presence of endothelial NO synthase and platelet endothelial cell adhesion molecule-1-negative tunnels, occasionally containing blood-derived cells, that probe the cardiac tissue. Immunohistochemical data show that monocytes/macrophages (MCs/Mphs) drill tunnels using the broad-spectrum mouse macrophage metalloelastase. 5-Bromo-2'-deoxyuridine incorporation and neo-endothelial markers present in the microvasculature of MCP-1 mouse hearts suggest an active angiogenic process. Further studies will be required to establish that the MC-/Mph-drilled tunnels evolve to become capillaries, connected to the existing vessels and colonized by circulating endothelial cell progenitors. This possibility is supported by the availability of these cells, which is demonstrated by cell tagging with β-galactosidase placed under an active endothelial Tie-2 promoter. This phenomenon might represent another mechanism, in addition to the secretion of the angiogenic factors, by which MCs/MPhs may participate in the elaboration of new blood vessels in adult tissues.

Original languageEnglish
Pages (from-to)378-384
Number of pages7
JournalCirculation Research
Volume87
Issue number5
StatePublished - Sep 1 2000
Externally publishedYes

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Keywords

  • Angiogenesis
  • Ischemic heart disease
  • Metalloelastase
  • Monocytes

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Moldovan, N. I., Goldschmidt-Clermont, P., Parker-Thornburg, J., Shapiro, S. D., & Kolattukudy, P. E. (2000). Contribution of monocytes/macrophages to compensatory neovascularization: The drilling of metalloelastase-positive tunnels in ischemic myocardium. Circulation Research, 87(5), 378-384.