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Regulating the angiogenic balance in tissues.

Elizabeth A Pollina1, Aster Legesse-Miller, Erin M Haley

  • 1Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA

Cell Cycle (Georgetown, Tex.)
|July 22, 2008
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Fibroblasts regulate blood vessel formation by secreting different molecules when proliferating versus quiescent. Quiescent fibroblasts release more angiogenesis inhibitors like PEDF, while proliferating cells release more inducers like VEGF-C.

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Area of Science:

  • Cell biology
  • Angiogenesis research
  • Tissue microenvironment

Background:

  • Angiogenesis, the formation of new blood vessels, is tightly regulated by a balance of inducers and inhibitors within the tissue microenvironment.
  • Fibroblasts, key stromal cells, are hypothesized to influence this balance through secreted molecules.
  • The state of fibroblast proliferation (proliferative vs. quiescent) may dictate the type of angiogenic factors they release.

Purpose of the Study:

  • To investigate the role of fibroblasts in regulating angiogenesis.
  • To determine if fibroblast proliferation state influences the secretion of angiogenesis inducers and inhibitors.
  • To identify specific molecules secreted by fibroblasts that affect blood vessel formation.

Main Methods:

  • Microarray analysis to assess gene expression changes in fibroblasts transitioning between proliferative and quiescent states.
  • Collection of conditioned medium from fibroblasts in different states.
  • Immunoblotting to detect secreted protein levels of angiogenesis regulators.
  • Immunohistochemistry to examine fibroblast localization and protein expression in uterine tissue.

Main Results:

  • Microarray data showed differential regulation of angiogenesis inducers and inhibitors during fibroblast quiescence and cell cycle reentry.
  • Quiescent fibroblasts secreted higher levels of the angiogenesis inhibitor pigment epithelium-derived factor (PEDF).
  • Proliferating fibroblasts secreted increased levels of the angiogenesis inducer vascular endothelial growth factor-C (VEGF-C).
  • Quiescent fibroblasts also secreted a distinct form of the angiogenesis inhibitor thrombospondin-2.

Conclusions:

  • Fibroblasts actively modulate the angiogenesis balance through differential secretion of regulatory molecules based on their proliferation state.
  • Pigment epithelium-derived factor (PEDF) secreted by quiescent fibroblasts may play a role in maintaining vascular quiescence, particularly in tissues like the uterus.
  • This study highlights fibroblasts as critical regulators of angiogenesis through the secretion of multiple factors.