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Generation of Human Blood Vessel Organoids from Pluripotent Stem Cells
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A vascular bed-specific pathway.

P V Guillot1, J Guan, L Liu

  • 1The Department of Medicine, Divisions of Molecular Medicine and Hematology-Oncology, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, USA.

The Journal of Clinical Investigation
|March 17, 1999
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Summary
This summary is machine-generated.

Researchers investigated how the endothelial nitric oxide synthase (eNOS) gene is regulated. They found specific signaling pathways in cardiac endothelium involving platelet-derived growth factor (PDGF) control gene expression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cardiovascular Research

Background:

  • Endothelial nitric oxide synthase (eNOS) gene expression is influenced by various extracellular signals.
  • Understanding the environmental regulation of eNOS is crucial for cardiovascular health.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of eNOS gene expression.
  • To identify specific signaling pathways involved in eNOS regulation within different vascular beds.

Main Methods:

  • Generation of transgenic mice with a human eNOS promoter-LacZ reporter construct.
  • Analysis of beta-galactosidase activity in various tissues to determine transgene expression patterns.
  • In vitro studies using murine endothelial progenitor cells and conditioned media from different cell types.

Main Results:

  • Transgene expression was observed in the endothelium of the brain, heart, skeletal muscle, and aorta, but not in the liver, kidney, or spleen.
  • Conditioned media from cardiac myocytes, skeletal myocytes, and brain astrocytes induced promoter activity.
  • Platelet-derived growth factor (PDGF) was identified as a key regulator, with distinct PDGF-dependent and independent elements in the eNOS promoter.

Conclusions:

  • The eNOS gene is regulated in cardiac endothelium via a microvascular bed-specific signaling pathway.
  • This pathway involves both PDGF-dependent and PDGF-independent mechanisms, highlighting complex gene regulation in endothelial cells.