Microfabricated scaffold-guided endothelial morphogenesis in three-dimensional culture

Area of Science:

• Biomedical Engineering
• Cell Biology
• Tissue Engineering

Background:

• Angiogenesis, the formation of new blood vessels, is crucial for tissue engineering and has clinical relevance in cancer, vascular disease, and wound healing.
• Current in vitro methods for studying angiogenesis lack spatial control and reproducibility, limiting their use in high-throughput drug testing.
• Developing methods to guide morphogenesis and vessel orientation is essential for advancing regenerative medicine and therapeutic development.

Purpose of the Study:

• To develop a bioreactor system for scaffold-guided tubulogenesis that spatially controls blood vessel formation and orientation.
• To create a reproducible in vitro model for studying angiogenesis with applications in drug discovery and tissue engineering.
• To investigate the use of both rigid and soft scaffolds for guiding microvessel formation in a 3-D organotypic culture system.

Main Methods:

• Fabrication of rigid scaffolds using photolithography and soft scaffolds using polydimethylsiloxane (PDMS) stamps to create microchannels.
• Seeding dermal microvascular endothelial cells onto scaffolds and culturing them within collagen gel containing dermal fibroblasts in a Transwell system for up to 2 weeks.
• Utilizing standard histology and immunohistochemistry to confirm vessel formation along microchannel walls.

Main Results:

• Confirmed successful vessel formation along microchannel walls in 3-D organotypic cultures using both rigid and soft scaffolds.
• Demonstrated that the developed bioreactor system can spatially control microvessel formation and orientation.
• Validated the system's ability to support mature vessel development over a 2-week culture period.

Conclusions:

• The developed scaffold-guided tubulogenesis system offers a novel tool for controlled angiogenesis in vitro.
• This approach facilitates the spatial guidance of microvessel networks, enabling new possibilities for drug screening and therapeutic development.
• The system holds potential for exploring revascularization in decellularized matrices and interfacing with microfluidic systems for advanced applications.