Hemodynamic forces regulate embryonic stem cell commitment to vascular progenitors

Area of Science:

• Stem Cell Biology
• Cardiovascular Research
• Biomedical Engineering

Background:

• Embryonic stem (ES) cells possess pluripotency, differentiating into all cell types.
• Embryonic development involves exposure to hemodynamic forces, like fluid flow, essential for proper cardiac formation.
• Absence of fluid flow leads to abnormal cardiac chamber and valve development.

Purpose of the Study:

• To investigate the role of hemodynamic forces, specifically fluid shear stress, in ES cell differentiation.
• To explore the potential of ES cell-derived vascular progenitor cells (VPCs) for therapeutic applications in vascular repair and engineering.
• To understand the kinetics of ES cell differentiation towards the endothelial lineage under fluid shear stress.

Main Methods:

• Exposure of pluripotent embryonic stem cells to controlled fluid shear stress.
• Analysis of cell cycle progression (S and G(2)-M phases) and chromatin structure.
• Quantification of CD31(+) vascular progenitor cell commitment and characterization of their endothelial markers (eNOS, vWF) and functions (LDL uptake, network formation).

Main Results:

• Fluid shear stress increased the percentage of cells in S and G(2)-M phases, promoting gene transcription.
• Shear stress accelerated ES cell commitment to CD31(+) VPCs.
• ES-derived CD31(+) cells exhibited endothelial markers (eNOS, vWF) and functional capabilities like LDL uptake and tubular network formation.

Conclusions:

• Hemodynamic forces, particularly fluid shear stress, are critical regulators of ES cell differentiation into endothelial lineage.
• ES-derived CD31(+) VPCs hold significant therapeutic potential for vascular damage repair and engineered vascular grafts.
• A multidisciplinary approach is essential to overcome challenges in producing pure, stable, and non-tumorigenic endothelial progenitors for clinical applications.