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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Related Experiment Video

Updated: Mar 11, 2026

An In Vitro 3D Model and Computational Pipeline to Quantify the Vasculogenic Potential of iPSC-Derived Endothelial Progenitors
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Multifactorial Optimizations for Directing Endothelial Fate from Stem Cells.

Drew E Glaser1,2, William S Turner1, Nicole Madfis3

  • 1School of Engineering, University of California, Merced, United States of America.

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|December 2, 2016
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Summary
This summary is machine-generated.

Optimized stem cell differentiation protocols enhance endothelial cell (EC) production. Key factors include cell density and fibronectin signaling, improving EC purity from embryonic stem cells (ESC).

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Area of Science:

  • Stem cell biology
  • Vascular biology
  • Tissue engineering

Background:

  • Embryonic stem cells (ESC) and induced pluripotent stem (iPS) cells offer models for vascular development.
  • Current methods for endothelial cell (EC) generation yield progenitor cells but struggle with mature EC maturation.
  • Optimizing differentiation protocols for diverse stem cell lines is a significant challenge.

Purpose of the Study:

  • To investigate and optimize factors for efficient endothelial cell differentiation from ESCs.
  • To identify key microenvironmental and chemical cues that promote vascular progenitor and mature EC generation.
  • To develop a robust protocol applicable across multiple ESC lines.

Main Methods:

  • Utilized a stage-specific, chemically-defined derivation methodology.
  • Examined kinetics, cell seeding density, matrix signaling (fibronectin), and growth factor supplementation (VEGF, bFGF).
  • Tested combinations and levels of factors in four distinct ESC lines.

Main Results:

  • High cell seeding density and fibronectin matrix signaling significantly promoted vascular progenitor cell (VPC) generation.
  • VEGF supplementation showed limited statistical significance, potentially due to fibronectin matrix sequestration.
  • GSK3-kinase inhibitor (CHIR) hindered KDR+ cell generation in optimized formulations.
  • Achieved high purity of mature vascular endothelial (VE)-cadherin+ EC (up to 93% from mouse ESC, 57% from human ESC) prior to purification.

Conclusions:

  • Temporal development, cell seeding density, and fibronectin signaling are critical for efficient ESC-derived EC generation.
  • Optimized protocols significantly enhance the yield of mature ECs from both mouse and human ESCs.
  • The developed methodology offers a more robust approach to generating ECs for research and therapeutic applications.