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Implantation of Electrospun Vascular Grafts with Optimized Structure in a Rat Model
Published on: June 27, 2018
Electrospun polydioxanone-elastin blends: potential for bioresorbable vascular grafts.
S A Sell1, M J McClure, C P Barnes
1Virginia Commonwealth University, Richmond, VA 23298, USA.
Biomedical Materials (Bristol, England)
|May 8, 2008
Summary
A new electrospun vascular graft blending polydioxanone (PDO) and elastin shows promising mechanical properties and bioactivity for tissue regeneration. This PDO-elastin composite closely mimics native artery function and promotes cell migration, offering potential for small-diameter vascular applications.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Cardiovascular Engineering
Background:
- Native arterial tissue requires specific mechanical properties and bioactivity for proper function and regeneration.
- Small-diameter vascular grafts often face challenges with mechanical mismatch and limited tissue integration.
- Polydioxanone (PDO) offers mechanical integrity, while elastin provides elasticity and promotes cellular regeneration.
Purpose of the Study:
- To design and fabricate an electrospun cardiovascular graft using polydioxanone (PDO) and elastin.
- To match the mechanical properties, particularly compliance and suture retention, of native arterial tissue.
- To evaluate the bioactivity and tissue regeneration potential of the PDO-elastin composite grafts.
Main Methods:
- Electrospinning of polydioxanone (PDO) and elastin blends into vascular graft conduits.
- Uniaxial tensile testing and suture retention tests to assess mechanical properties.
- Dynamic compliance measurements under varying arterial pressures.
- Preliminary in vitro cell culture studies to evaluate cell migration and bioactivity.
Main Results:
- The 50:50 PDO-elastin ratio closely mimicked the compliance of native femoral artery.
- Grafts with higher elastin content demonstrated favorable suture retention strength compared to native vessels.
- Elastin-containing grafts were bioactive, facilitating cell migration through the graft wall within 7 days.
- Pure PDO scaffolds did not support cell migration, highlighting the role of elastin.
Conclusions:
- Electrospun PDO-elastin composite grafts possess mechanical properties comparable to native arteries.
- The inclusion of elastin is crucial for graft bioactivity and promoting cellular infiltration and regeneration.
- These PDO-elastin grafts show significant potential as small-diameter vascular grafts, warranting further investigation.
