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Engineering 3D Cellularized Collagen Gels for Vascular Tissue Regeneration
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Targeting Heparin to Collagen within Extracellular Matrix Significantly Reduces Thrombogenicity and Improves
Bin Jiang1, Rachel Suen, Jason A Wertheim1,2
1Department of Surgery, Feinberg School of Medicine, Northwestern University , Chicago, Illinois 60611, United States.
Biomacromolecules
|December 13, 2016
Summary
Researchers developed a heparin derivative (CBP-heparin) to reduce blood clotting in engineered vascular grafts. This modification enhances heparin binding to extracellular matrix (ECM), improving graft performance and durability for tissue engineering applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Vascular Biology
Background:
- Thrombosis is a major limitation in developing small-diameter vascular grafts, particularly those using extracellular matrix (ECM).
- Current ECM-derived grafts face challenges with blood compatibility and long-term endothelialization.
- Effective strategies are needed to improve the hemocompatibility and cellular integration of engineered vascular tissues.
Purpose of the Study:
- To develop a method for enhancing functional heparin deposition on vascular ECM.
- To reduce thrombogenicity and improve endothelial cell attachment in ECM-based vascular grafts.
- To overcome key challenges in the tissue engineering of bioartificial vessels.
Main Methods:
- Chemically modifying vascular ECM by covalently linking a collagen binding peptide (CBP) to heparin.
- Creating a heparin derivative (CBP-heparin) that selectively binds to collagens within the ECM.
- Assessing heparin deposition, platelet binding, whole blood clotting, and endothelial cell attachment on modified ECM.
Main Results:
- CBP-heparin modification significantly increased functional heparin deposition on ECM (approx. 7.2-fold).
- Platelet binding was reduced by over 70% and whole blood clotting by over 80% on modified ECM.
- Long-term endothelial cell attachment to ECM-derived vascular conduits was stabilized by CBP-heparin addition.
Conclusions:
- CBP-heparin provides a simple and effective method to increase functional heparin on ECM surfaces.
- This strategy significantly minimizes the thrombogenicity of decellularized tissue for vascular grafts.
- The findings represent a significant advancement in tissue engineering for bioartificial vessels and organs.
