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Autocrine Hyaluronan Influences Sprouting and Lumen Formation During HUVEC Tubulogenesis In Vitro.

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  • 1Center for Fundamental Immunology, Matrix Biology Program, Benaroya Research Institute at Virginia Mason, Seattle, Washington.

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Summary

Autocrine hyaluronan (HA) produced by vascular endothelial cells promotes microvascular sprouting and lumen development. This study highlights the role of cell-associated HA in tubulogenesis.

Keywords:
4-methylumbelliferoneangiogenesiscollagen gelhyaluronan synthasehyaluronidasevasculogenesis

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Area of Science:

  • Cell Biology
  • Vascular Biology
  • Biochemistry

Background:

  • Extensive research has explored the role of interstitial hyaluronan (HA) in regulating vascular growth.
  • The contribution of autocrine HA, synthesized by vascular endothelial cells themselves, remains less understood.

Purpose of the Study:

  • To investigate the influence of autocrine HA produced by human umbilical vein endothelial cells (HUVECs) on tubulogenesis.
  • To elucidate the role of autocrine HA in angiogenic and vasculogenic processes.

Main Methods:

  • Utilized three-dimensional collagen gel cultures of HUVECs.
  • Employed molecular biology techniques (mRNA analysis) and advanced microscopy (confocal immunofluorescence) to detect HA and its synthesis.
  • Assessed the impact of HA synthesis inhibitors and hyaluronidase on tubulogenesis.

Main Results:

  • Tubulogenic HUVECs upregulated HAS2 mRNA and increased cell-associated HA synthesis.
  • Autocrine HA was localized within the lumens of developing endothelial tubes.
  • Inhibition of HA synthesis or activity significantly suppressed lumen formation in angiogenic cultures.

Conclusions:

  • Autocrine HA plays a crucial role in microvascular sprouting and lumen development.
  • Luminal HA is essential for the formation of functional microvascular tubes.
  • Findings suggest a specific role for autocrine HA in endothelial tubulogenesis.