Small diameter helical vascular scaffolds support endothelial cell survival

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cardiovascular Engineering

Background:

• Cardiovascular disease necessitates effective small-diameter vascular grafts.
• Current grafts often fail due to limitations in replicating natural arterial structure and hemodynamics.

Purpose of the Study:

• To design and fabricate nano-fibrous tubular scaffolds with inner helices to mimic natural arterial spiral flow.
• To evaluate the performance of these helical scaffolds in supporting human coronary artery endothelial cell (EC) growth and function.

Main Methods:

• Fabrication of nano-fibrous tubular scaffolds using electrospinning from polyvinyl alcohol and gelatin blends.
• Incorporation of inner helices to induce a physiological spiral flow profile.
• Seeding of human coronary artery endothelial cells (ECs) and assessment of viability, distribution, gene expression, and response to shear stress under static and flow conditions.

Main Results:

• Helical scaffolds demonstrated significantly improved EC distribution (94% ± 9%) compared to conventional scaffolds (82% ± 7.2%).
• Enhanced EC responsiveness to shear stress and improved ability to withstand physiological pressures were observed.
• The helical structure provided a superior niche for EC growth.

Conclusions:

• The developed helical vascular scaffold offers an improved microenvironment for endothelial cell growth.
• This novel scaffold shows promise as a potential small-diameter vascular graft for treating cardiovascular disease.