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Cellular Encapsulation in 3D Hydrogels for Tissue Engineering
Published on: October 26, 2009
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Strategy for improving cell-mediated vascularized soft tissue formation in a hydrogen peroxide-triggered
Shih-Yen Wei1, Tzu-Hsuan Chen1, Feng-Sheng Kao1
1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.
Journal of Tissue Engineering
|March 17, 2022
Summary
Chemically-crosslinked collagen hydrogels show promise for vascular network formation. Optimizing crosslinker levels and increasing hypoxia effectively improved blood vessel density in engineered tissues.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Regenerative Medicine
Background:
- Physically-crosslinked collagen hydrogels support cell-based vascular network formation but cause excessive contraction and degradation.
- Chemically-crosslinked collagen hydrogels offer improved properties but have failed to achieve uniform vascularization in vivo.
- Engineering functional vascular networks within hydrogels remains a significant challenge in tissue regeneration.
Purpose of the Study:
- To investigate and overcome the limitations in engineering vascular networks using a collagen-Phenolic hydrogel model.
- To identify factors hindering cell-mediated vasculature formation in chemically-crosslinked hydrogels.
- To enhance the density and perfusion of blood vessels within engineered tissues.
Main Methods:
- Utilized an enzymatically chemically-crosslinked collagen-Phenolic hydrogel as a model system.
- Investigated the impact of inflammation duration and hydrogen peroxide levels on vascularization.
- Manipulated unreacted crosslinker amounts and employed a spacer for co-implantation to modulate the microenvironment.
- Validated findings through computer-based simulations.
Main Results:
- Prolonged inflammation and high hydrogen peroxide levels impaired blood vessel formation.
- Reducing unreacted crosslinkers decreased host myeloid cell infiltration but did not improve vascular density.
- Co-implantation with a spacer increased hypoxia and structural integrity, leading to a two-fold increase in perfused blood vessel density.
- Results were consistent with computational modeling.
Conclusions:
- Simultaneously reducing crosslinker-induced immune response and increasing hypoxia are crucial for improving cell-mediated vascular network formation.
- Optimized chemical crosslinking strategies can overcome previous limitations in hydrogel-based vascular tissue engineering.
- This study provides a framework for designing advanced biomaterials for enhanced vascularization in regenerative medicine.
