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Novel method to improve vascularization of tissue engineered constructs with biodegradable fibers
Hui Kian Wong1, Chee Ren Ivan Lam, Feng Wen
1School of Materials Science and Engineering, Nanyang Technological University, Singapore.
Biofabrication
|January 8, 2016
Summary
This study presents a novel bioreactor-free method to create vascular networks for tissue engineered grafts. Artificial capillaries guide endothelial cell growth, significantly improving graft vascularization and integration with host vasculature upon implantation.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Tissue engineered grafts require robust vascularization for successful in vivo integration and function.
- Current prevascularization strategies often rely on complex bioreactor systems, limiting scalability and clinical application.
- Poor perfusion in engineered tissues hinders their survival and therapeutic efficacy.
Purpose of the Study:
- To develop a novel, bioreactor-free method for engineering vascular networks in tissue scaffolds.
- To enhance the prevascularization of tissue engineered grafts using a hybrid construct approach.
- To evaluate the in vitro and in vivo performance of the engineered vascular network.
Main Methods:
- Confluent culture of human umbilical vein endothelial cells (HUVECs) on resorbable poly(D,L-lactide-co-glycolide) microfibers.
- Embedding cell-laden microfibers within a collagen matrix containing HUVECs and vascular endothelial growth factor.
- Utilizing fluorescently labeled HUVECs for monitoring capillary network formation and assessing vessel density over 30 days.
- Implantation onto immune-deficient mice to evaluate anastomosis with host vasculature.
Main Results:
- The microfibers provided contact guidance, promoting endothelial cell branching and forming stable microvascular networks.
- Degradation of microfibers preserved vessel integrity, and engineered capillaries successfully anastomosed with de novo capillaries.
- Implanted scaffolds demonstrated rapid integration with host vasculature within 24 hours, confirmed by CD31 and von Willebrand factor staining.
- The hybrid construct significantly improved overall vascularization and interconnections compared to controls.
Conclusions:
- A novel, static 2D culture method effectively engineers 3D vascular networks without bioreactors.
- Contact guidance from microfibers is crucial for directed endothelial cell organization and network formation.
- The engineered vascular network enhances graft prevascularization and promotes rapid anastomosis with host vasculature, showing promise for surgical implantation.
