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Micropatterning and Assembly of 3D Microvessels
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Engineering polystyrene microtube-embedded composite hydrogels for tunable vascular morphogenesis.

Xianyang Li1, Sadia Khan1, Liyuan Wang2

  • 1Biomedical Engineering, The State University of New York at Binghamton, Binghamton, NY 13901, United States of America.

Biomedical Materials (Bristol, England)
|July 3, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel composite hydrogel using polystyrene microtubes (PS-MTs) to enhance microvessel formation in engineered tissues. This biomaterial improves vascular network structure and function for applications in regenerative medicine and drug testing.

Keywords:
3D tissue constructsendothelial cellsmicrovascular network formationmicrovessel morphogenesistopography

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Vascular Biology

Background:

  • Functional vascularization is essential for engineered tissues used in disease modeling, drug testing, and regenerative medicine.
  • Current methods struggle to create controlled, hierarchical microvessel networks with specific vascular features.
  • Achieving precise control over microvessel density, diameter, and connectivity remains a significant challenge.

Purpose of the Study:

  • To develop a composite hydrogel incorporating polystyrene microtubes (PS-MTs) for improved control over microvessel morphogenesis and functionality.
  • To investigate the impact of PS-MTs on vascular network structure, perfusability, and barrier integrity in a 3D co-culture system.
  • To assess the biocompatibility and dose-dependent effects of PS-MTs on endothelial cell and fibroblast co-cultures.

Main Methods:

  • Fabrication of PS-MTs via core-sheath electrospinning and fragmentation by ultrasonication.
  • Incorporation of PS-MT fragments into fibrin hydrogels for 3D cell culture.
  • Co-culture of endothelial cells and fibroblasts under interstitial flow, followed by analysis using microscopy and perfusion assays.

Main Results:

  • PS-MTs demonstrated excellent biocompatibility with no adverse effects on cell viability.
  • High PS-MT density (>4%) significantly increased vascular area fraction (40%) and vessel diameter (>2-fold).
  • Enhanced perfusability (71% increase in microbead flow speed) and improved vascular barrier integrity (66% decrease in dextran permeability) were observed.

Conclusions:

  • Incorporating PS-MTs into fibrin hydrogels effectively modulates microvascular network organization and function in a dose-dependent manner.
  • This composite hydrogel strategy offers a flexible approach for biofabricating functional, multiscale vascular networks for engineered tissues.
  • Tuning PS-MT density allows for local control of vessel morphogenesis, enabling application-specific vascular architecture engineering.