Angiogenesis in Free-Standing Two-Vasculature-Embedded Scaffold Extruded by Two-Core Laminar Flow Device.

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Vascular Biology

Background:

• Engineered thick tissues require rapid pre-vascular structure formation.
• Angiogenesis in free-standing scaffolds is limited by growth factor (GF) delivery.
• Previous studies have not extensively explored angiogenic sprouting in such scaffolds.

Purpose of the Study:

• To investigate angiogenic sprouting in a novel free-standing, two-vasculature-embedded scaffold.
• To evaluate the impact of different culture conditions and additional GFs on angiogenesis.
• To establish a method for rapid pre-vascularization in tissue engineering.

Main Methods:

• A two-core laminar flow device was used to create a scaffold with a vascular channel (human umbilical vein endothelial cells [HUVECs] in type-1 collagen), a hollow channel, and a gelatin-alginate shell.
• Three different culture conditions with additional GFs were tested.
• Angiogenic sprouting and HUVEC morphology/viability were monitored over 10 days.

Main Results:

• Angiogenic sprouting initiated by day 1 and progressed towards the hollow channel by day 10 under GF-flowing conditions.
• HUVECs exhibited homogeneous, elongated spindle-like morphology due to medium flow.
• HUVEC viability remained above 80% up to day 10.

Conclusions:

• The developed scaffold and culture method successfully promoted angiogenic sprouting in a free-standing construct.
• This approach offers a promising strategy for vascularizing engineered tissues.
• The method has potential applications in vascular investigation and drug discovery.