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Engineering 3D Cellularized Collagen Gels for Vascular Tissue Regeneration
Published on: June 16, 2015
Acellular vascular grafts generated from collagen and elastin analogs
Vivek A Kumar1, Jeffrey M Caves, Carolyn A Haller
1Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
Acta Biomaterialia
|June 8, 2013
Summary
This study presents a novel method for rapidly fabricating vascular grafts using collagen and elastin-like polymers. These engineered grafts mimic native blood vessel properties and show reduced platelet adherence, offering a promising alternative to current methods.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Current tissue-engineered vascular grafts face challenges with long fabrication times due to cell sourcing and matrix production.
- Developing robust, load-bearing extracellular matrices is crucial for functional vascular grafts.
Purpose of the Study:
- To propose a new design strategy for fabricating tubular vascular conduits.
- To mimic native blood vessel structure and function using collagen and elastin-like protein polymers.
- To achieve rapid fabrication of vascular grafts with improved mechanical properties and reduced inflammatory response.
Main Methods:
- Fabrication of tubular conduits using collagen fiber networks and elastin-like protein polymers.
- Characterization of mechanical properties including ultimate tensile strength (UTS), strain to failure, Young's modulus, and resilience.
- Assessment of graft compliance, burst pressure, and platelet adherence compared to expanded polytetrafluoroethylene (ePTFE).
- In vivo evaluation in a rat aortic interposition model using Doppler ultrasound, CT angiography, and immunohistochemistry.
Main Results:
- Dense fibrillar collagen networks demonstrated mechanical properties comparable to native blood vessels.
- Resilience measurements showed significant energy recovery during loading-unloading cycles.
- Rapid fabrication of multilayer tubular conduits (1-4mm internal diameter) was achieved, maintaining collagen ultrastructure.
- Engineered grafts exhibited favorable compliance, high burst pressures, and significantly reduced platelet adherence versus ePTFE.
- In vivo studies at 2 weeks indicated a limited early inflammatory response.
Conclusions:
- Engineered collagen-elastin composites offer a promising strategy for fabricating synthetic vascular tissues.
- This approach allows for defined extracellular matrix content, composition, and architecture.
- The rapid fabrication method and favorable in vivo results highlight the potential of these grafts for clinical applications.
