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Cell-cell interactions influence vascular reprogramming by Prox1 during embryonic development.

Harold Kim1, Maribelle Cruz, Annie Bourdeau

  • 1Department of Medical Biophysics, Sunnybrook Research Institute, University of Toronto, Toronto, Ontario, Canada.

Plos One
|January 24, 2013
PubMed
Summary
This summary is machine-generated.

Lymphangiogenesis, the development of lymphatic vessels, shows vascular specificity. Prox1 overexpression reprograms venous but not arterial cells, suggesting cell-cell interactions guide this process.

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Area of Science:

  • Developmental Biology
  • Vascular Biology
  • Cell Biology

Background:

  • Lymphangiogenesis is a complex process involving endothelial cell reprogramming.
  • Lymphatic development exhibits vascular specificity, originating from the cardinal vein, not the dorsal aorta.
  • Prox1 is a key transcription factor in lymphatic development.

Purpose of the Study:

  • To investigate the role of Prox1 in determining vascular specificity during lymphangiogenesis.
  • To understand the mechanisms underlying the selective reprogramming of endothelial cells.

Main Methods:

  • Utilized a transgenic model to overexpress Prox1.
  • Examined Prox1 expression and its effects on venous and arterial endothelial cells in vivo.
  • Investigated potential cell-cell interactions influencing vascular specificity.

Main Results:

  • Prox1 overexpression successfully reprogrammed venous endothelial cells into lymphatic endothelial cells.
  • Prox1 overexpression did not reprogram arterial endothelial cells, despite forced expression in both vascular beds.
  • Evidence suggests cell-cell interactions between arterial endothelial cells and smooth muscle cells contribute to specificity.

Conclusions:

  • Prox1's ability to induce lymphangiogenesis is specific to the venous endothelium.
  • Cell-cell interactions, potentially involving smooth muscle cells, play a crucial role in maintaining vascular specificity during embryogenesis.
  • These findings offer new insights into the regulatory mechanisms of lymphangiogenesis and vascular development.