Human iPSC-Derived Blood Vessel Organoids for Studying Chronic Hypoxia-Induced Microvascular Dysfunction

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Vascular Biology

Background:

• Microvascular dysfunction from hypoxia is central to diseases such as cancer, cardiovascular disease, and retinal conditions.
• Existing human models for studying these microvascular changes are limited.
• Understanding hypoxia's impact on microvasculature is crucial for disease pathology.

Purpose of the Study:

• To develop and validate a robust 3D in vitro model using human induced pluripotent stem cell-derived blood vessel organoids.
• To analyze microvascular remodeling in response to chronic hypoxia.
• To establish a human-relevant platform for studying microvascular diseases.

Main Methods:

• Utilized human induced pluripotent stem cell-derived blood vessel organoids in a 3D in vitro setting.
• Employed optical tissue clearing, high-resolution immunofluorescence, and surface marker analysis.
• Quantitatively assessed hypoxia-driven changes in endothelial cells, pericytes, and the basal lamina.

Main Results:

• Chronic hypoxia (1% O2 for 1 week) in blood vessel organoids recapitulated key pathological features of microvascular dysfunction.
• Observed significant structural remodeling within the organoids.
• Identified a dysregulated secretome with altered vascular endothelial growth factor signaling.

Conclusions:

• The developed 3D blood vessel organoid model provides a versatile and human-relevant platform.
• This model effectively studies microvascular remodeling induced by chronic hypoxia.
• It offers a valuable tool for investigating the pathogenesis of microvascular-related diseases.