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Keith H K Wong1, James G Truslow, Aimal H Khankhel

  • 1Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215, USA.

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Summary

Adding drainage channels to dense scaffolds stabilizes blood vessel formation and perfusion in tissue engineering. This mimics lymphatic function, crucial for vascular stability in engineered tissues.

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Area of Science:

  • Biomedical Engineering
  • Tissue Engineering
  • Vascular Biology

Background:

  • * Stable microvasculature formation is a key challenge in tissue engineering.
  • * Transmural pressure is critical for maintaining vascular stability and perfusion.
  • * Dense, hydraulically resistive scaffolds impede vascularization.

Purpose of the Study:

  • * To investigate the role of drainage channels in stabilizing microvasculature within dense fibrin scaffolds.
  • * To determine the impact of scaffold density and drainage on vascular adhesion and perfusion.
  • * To estimate the minimum transmural pressure required for vascular stability.

Main Methods:

  • * In vitro experiments using fibrin scaffolds with varying densities (6-30 mg/mL).
  • * Introduction of empty drainage channels analogous to lymphatic microvasculature.
  • * Assessment of endothelial delamination, perfusion rate, and hydraulic conductivity.
  • * Computational modeling to estimate transmural pressure requirements.

Main Results:

  • * Drainage channels significantly stabilized vascular adhesion and maintained perfusion in dense scaffolds.
  • * In the absence of drainage, endothelial delamination increased with scaffold density, and conductivity decreased 20-fold.
  • * Localized stabilization by single drainage channels depended on proximity and scaffold density.
  • * Computational modeling estimated a minimum transmural pressure of 0.40-1.36 cm H2O for vascular stability.

Conclusions:

  • * Drainage function, mimicking lymphatic microvasculature, is essential for vascular stability and perfusion in dense, resistive tissue engineering scaffolds.
  • * The findings highlight the critical role of drainage in overcoming challenges associated with vascularizing engineered tissues.
  • * Engineered fibrin patches with integrated drainage channels demonstrated long-term vascular stability and perfusion.