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Area of Science:

  • Biomedical Engineering
  • Stem Cell Biology
  • Vascular Biology

Background:

  • Tissue-engineered constructs require functional vasculature for nutrient and oxygen supply.
  • Vascular derivatives from human induced pluripotent stem cells (hiPSCs) offer patient-specific therapies and scalable cell sources.
  • Therapeutic vascular cells must produce extracellular matrix (ECM) for structural integrity and growth factors for integration.

Purpose of the Study:

  • To investigate whether vascular cells derived from hiPSCs possess critical properties for engineered vascular constructs.
  • To assess the impact of low-oxygen differentiation conditions on hiPSC-derived vascular cell function.
  • To evaluate the potential of hiPSC-derived vascular cells in therapeutic applications.

Main Methods:

  • Human induced pluripotent stem cells (hiPSCs) were co-differentiated into early vascular cells (EVCs) comprising endothelial cells (ECs) and pericytes.
  • Differentiation was performed under varying low-oxygen and atmospheric conditions.
  • Isolated ECs were passaged, and their extracellular matrix (ECM) and growth factor production, as well as cell proliferation and marker expression, were analyzed.

Main Results:

  • EVCs differentiated under low-oxygen conditions showed abundant production of collagen IV, fibronectin, vascular endothelial growth factor (VEGF), and angiopoietin 2.
  • EVCs differentiated under atmospheric conditions produced less ECM but higher levels of angiopoietin 1.
  • Isolated ECs maintained EC marker expression (vascular endothelial cadherin) up to three passages, exhibited increased ECM production compared to EVCs, and adopted an arterial-like fate.

Conclusions:

  • hiPSC-derived vascular cells, particularly when differentiated under low-oxygen conditions, exhibit essential properties for engineered vascular constructs.
  • These cells demonstrate robust ECM and growth factor production, crucial for structural integrity and integration.
  • hiPSC vascular derivatives represent a promising cell source for vascular construction and therapeutic applications.