Engineering and Integrating Blood Vessel Organoids: a Comprehensive Blueprint for Physiological and Disease Modeling.

The human vascular network is a highly dynamic, complex and organ-specific microenvironment essential for organ homeostasis. Traditional 2D cell cultures fail to capture its complex intercellular interactions, tissue-specific architectures, and mechanobiological cues. Blood vessel organoids (BVOs) generated from human induced pluripotent stem cells (hiPSCs) replicate the structure and function of blood vessels. Because hiPSCs preserve the donor's telomere length and epigenetic memory, BVOs may preserve the genesis memory, opening up a completely new avenue for the study of vascular disorders. In this review, we systematically outline the methods for in vitro blood vessel generation and explore how vascularizing parenchymal organoids actively drives tissue maturation while overcoming hypoxic limitations. We assess the vital transition from biochemical induction to biomechanical integration, highlighting how microfluidic organ-on-a-chip (OoC) platforms resolve the lineage-specific media dilemma and impose the physiological shear stress necessary for definitive vascular maturation. Furthermore, we comprehensively summarize the applications of BVOs as personalized preclinical avatars across diverse pathologies, including diabetic vasculopathy, cerebrovascular and cardiovascular diseases, tumor immune evasion, hereditary anomalies, and infectious vasculotropism. Finally, we address critical current bioengineering constraints-notably incomplete vessel maturation, the absence of functional lymphatic systems, and the lack of immunocompetent microenvironments-providing strategic future perspectives to accelerate the translation of BVOs in precision and regenerative medicine.