Animal-origin-free method for generating blood vessel organoids

Area of Science:

• Biotechnology
• Regenerative Medicine
• Vascular Biology

Background:

• Blood vessel organoids (BVOs) are crucial for studying vascular diseases and developing therapies.
• Current BVO generation methods are complex, labor-intensive, and use animal-derived materials, hindering reproducibility and clinical use.

Purpose of the Study:

• To develop a simplified, animal-origin-free protocol for BVO generation.
• To enable high-throughput automated workflows for BVO production.
• To improve reproducibility and scalability of BVO technology for clinical translation.

Main Methods:

• Utilized ultra-low attachment 96-well U-bottom plates for standardized human induced pluripotent stem cell (hiPSC) aggregation.
• Developed a single-layer
• sitting drop
• culture method using a human-derived collagen-based extracellular matrix.
• Employed flow cytometry to analyze cellular composition and in vivo transplantation to assess functional integration.

Main Results:

• Generated BVOs with reproducible morphology and cellular composition, including CD31+ endothelial cells and PDGFRβ+ pericytes.
• The
• sitting drop
• method requires fewer materials and handling steps compared to traditional two-layer cultures.
• Transplanted BVOs integrated into host vasculature in a mouse wound model, demonstrating therapeutic potential.

Conclusions:

• The novel
• sitting drop
• protocol offers a robust, animal-origin-free, and automation-ready method for BVO generation.
• This simplified approach enhances reproducibility and scalability, facilitating high-throughput screening and clinical applications.
• The developed method paves the way for advancing vascular organoid technology in research and therapeutics.