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Programming the Self-Organization of Endothelial Cells into Perfusable Microvasculature.

Katelyn A Cabral1, Vasudha Srivastava2, Austin J Graham2,3

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Researchers optimized conditions for endothelial cells (ECs) to self-organize into perfusable 3D microvascular networks. Key factors included fibrillar collagen and removal of inhibitory serum proteins, enabling rapid network formation.

Keywords:
bioprintingcell behaviorcell patterningengineered microvasculatureengineered tissuesmicroenvironmentoptimizationtissue morphogenesisvasculogenesis

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Area of Science:

  • Biomaterials science
  • Cell biology
  • Tissue engineering

Background:

  • Constructing 3D microvascular networks is challenging.
  • Bioprinting offers potential for patterning endothelial cells (ECs).
  • Microenvironmental cues for EC self-organization into microvessels are not fully understood.

Purpose of the Study:

  • Investigate microenvironmental factors influencing EC self-organization into microvessels.
  • Identify conditions promoting cohesive and perfusable 3D microvascular network formation.
  • Establish design principles for bioprinting-based microvascular engineering.

Main Methods:

  • Patterned densely packed ECs within a 3D extracellular matrix (ECM).
  • Varied ECM composition (e.g., collagen I) and media components (e.g., fetal bovine serum).
  • Observed EC behavior, cord formation, lumenization, and fluid flow.

Main Results:

  • Fibrillar matrices like collagen I promoted EC condensation into cords.
  • A high-molecular-weight protein in fetal bovine serum inhibited EC condensation and destabilized cords.
  • Optimized conditions (fibrillar collagen, no inhibitory protein) led to polarized, lumenized cords with mural cells.
  • Branched, perfusable microvascular networks formed in 3 days.

Conclusions:

  • Fibrillar collagen and specific media modifications are crucial for EC self-organization.
  • Microenvironmental control is key for engineering perfusable microvascular networks.
  • These findings provide design principles for bioprinting and micropatterning techniques in tissue engineering.