An angiogenesis platform using a cubic artificial eggshell with patterned blood vessels on chicken chorioallantoic...

Area of Science:

• Biomedical Engineering
• Developmental Biology
• Tissue Engineering

Background:

• The chorioallantoic membrane (CAM) is a valuable model for angiogenesis and tissue engineering studies.
• Existing methods lack microscale control over blood vessel direction on the CAM.
• Need for precise vascular network design in tissue engineering applications.

Purpose of the Study:

• To develop a methodology for directing microscale blood vessel formation on the CAM.
• To establish a design theory for controlled angiogenesis using a 3D artificial eggshell.
• To investigate the role of pressure gradients in CAM vascular induction.

Main Methods:

• Utilized a cubic artificial eggshell with functionalized membranes to culture chick embryos.
• Designed microchannels (70-2000 μm width) and chambers to guide blood vessel growth and flow.
• Investigated the relationship between chamber size and vessel induction.
• Analyzed the effect of air pressure changes on CAM vascularization.
• Performed histological evaluations to confirm vessel infiltration into channels.

Main Results:

• Successfully directed blood vessel formation with blood flow into designed channels on the CAM.
• Established a design theory linking chamber size to vessel induction.
• Demonstrated mechanism of vessel induction via pressure changes.
• Confirmed histological presence of chorionic membrane and blood vessels within channels.
• Achieved channel-specific injection and screening of induced vessels.

Conclusions:

• The developed platform enables precise control over blood vessel position and space on the CAM.
• This methodology offers a powerful tool for biomedical research, particularly for localized vascular stimulation.
• Potential applications include creating living systems with controlled blood flow for advanced tissue engineering.