Longevity & AgingScientists Build Functional Human Blood Vessels in Just 5 Days Using Stem Cells
Researchers at Boston Children's Hospital developed a rapid method to generate vascular organoids (VOs) from induced pluripotent stem cells (iPSCs) in just five days. By simultaneously activating transcription factors ETV2 and NKX3.1—using either doxycycline-inducible or modified RNA systems—they co-differentiated endothelial cells and mural cells without requiring extracellular matrix scaffolding. The resulting organoids formed lumenized, polarized vascular networks. When further matured in ECM gels, vessels expanded nearly fourfold in diameter. Single-cell RNA sequencing confirmed vascular heterogeneity and arterial-venous patterning. In mice, transplanted VOs integrated with host circulation, restored blood flow in hindlimb ischemia models, and supported pancreatic islet engraftment. This platform significantly accelerates vascular organoid production and opens new avenues for disease modeling, drug testing, and regenerative cell therapies.
