Multilayered Hollow Tubes as Blood Vessel Substitutes

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Regenerative Medicine

Background:

• Cardiovascular diseases often necessitate vascular graft replacement.
• Current small-diameter vascular grafts have limitations in performance and availability.
• Developing functional, biocompatible vascular substitutes is crucial for cardiovascular therapies.

Purpose of the Study:

• To engineer novel multilayered hollow tubes using marine polysaccharides for potential use as small-diameter blood vessel grafts.
• To enhance the mechanical properties and cell-adhesion characteristics of these tubular structures.
• To evaluate the in vitro biological performance of the developed vascular grafts with relevant cell types.

Main Methods:

• Fabrication of hollow tubes via layer-by-layer assembly of chitosan and alginate on sacrificial templates.
• Cross-linking of the polysaccharide multilayers using genipin to improve mechanical integrity and reduce water uptake.
• Immobilization of fibronectin (FN) onto the tube surface to enhance cell adhesion.
• In vitro assessment of human umbilical vein endothelial cells (HUVECs) and human aortic smooth muscle cells (HASMCs) behavior on the tubes using a specialized culture apparatus.

Main Results:

• Successfully created genipin-cross-linked multilayered hollow tubes with enhanced mechanical properties and reduced water absorption.
• Fibronectin immobilization significantly improved cell adhesion, spreading, and proliferation of both HUVECs and HASMCs.
• The developed tubular structures demonstrated suitability for culturing endothelial cells on the inner surface and smooth muscle cells on the outer surface.

Conclusions:

• The developed marine polysaccharide-based hollow tubes represent a promising platform for small-diameter vascular grafting.
• These functionalized tubular structures show potential for advancing cardiovascular tissue engineering.
• This work opens new avenues for creating innovative multilayered tubular constructs for cardiovascular applications.