Human induced pluripotent stem cell-derived endothelial cells exhibit functional heterogeneity

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Vascular Biology

Background:

• Human induced pluripotent stem cell-derived endothelial cells (hiPSC-ECs) hold therapeutic potential for vascular diseases.
• Standard purification of hiPSC-ECs yields a heterogeneous population including arterial, venous, and lymphatic subtypes.
• The functional implications of this heterogeneity and the benefits of subtype enrichment remain unclear.

Purpose of the Study:

• To characterize the heterogeneity of hiPSC-ECs.
• To develop methods for enriching specific endothelial cell subtypes (arterial, venous, lymphatic).
• To assess the functional significance of subtype-specific hiPSC-ECs in promoting vascularization.

Main Methods:

• hiPSC-ECs were generated using vascular endothelial growth factor (VEGF)-A and bone morphogenetic protein-4.
• Subtype enrichment was achieved by modulating concentrations of VEGF-A, 8-bromoadenosine-3':5'-cyclic monophosphate, VEGF-C, and angiopoietin-1.
• Fluorescence-activated cell sorting (FACS) was used for purification based on CD31 expression.
• In vivo matrigel plug assay was performed to evaluate vascular network formation.

Main Results:

• FACS-purified CD31+ hiPSC-ECs exhibited typical endothelial markers and functions but were heterogeneous.
• Specific culture conditions successfully enriched for arterial, venous, and lymphatic hiPSC-EC phenotypes.
• Arterial-enriched hiPSC-ECs demonstrated superior performance in forming extensive capillary networks in vivo compared to heterogeneous populations.

Conclusions:

• CD31+ hiPSC-ECs purified via FACS represent a diverse endothelial cell population.
• Refined differentiation protocols can enrich for specific hiPSC-EC subtypes.
• Subtype enrichment, particularly for arterial hiPSC-ECs, offers functional advantages for enhancing neovascularization.