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Hyperglycemia induces differential change in oxidative stress at gene expression and functional levels in HUVEC and

Hemang Patel1, Juan Chen, Kumuda C Das

  • 1Department of Biomedical Engineering, Wayne State University, 2322 Engineering, 5050 Anthony Wayne Dr,, Detroit, MI 48202, USA. hemang@wayne.edu.

Cardiovascular Diabetology
|October 8, 2013
PubMed
Abstract

Insights

Hyperglycemia causes distinct endothelial dysfunction in different cell types, impacting reactive oxygen species (ROS) production and gene expression. Understanding these specific changes is key for developing effective diabetes vascular complication therapies.

Area of Science:

  • Endothelial biology
  • Vascular complications of diabetes
  • Systems biology

Background:

  • Endothelial dysfunction is an early sign of diabetic vascular complications.
  • Current therapies for endothelial dysfunction have faced challenges in clinical trials.
  • A systems approach is needed to define hyperglycemia-induced endothelial dysfunction.

Purpose of the Study:

  • To investigate hyperglycemia-induced endothelial dysfunction in human umbilical vein endothelial cells (HUVEC) and human microvascular endothelial cells (HMVEC).
  • To analyze functional changes and gene expression profiles related to reactive oxygen species (ROS) production and mitochondrial function.

Main Methods:

  • Real-time PCR for gene expression analysis of key enzymes.
  • Dihydroethidium (DHE) fluorescence for superoxide (O₂⁻) production.
  • Amplex Red assay for hydrogen peroxide (H₂O₂) production.
  • JC-10 assay for mitochondrial membrane polarization.

Main Results:

  • Superoxide (O₂⁻) levels increased similarly in both HUVEC and HMVEC under hyperglycemia.
  • HUVEC showed increased H₂O₂ production and mitochondrial hyperpolarization, with downregulated ROS-neutralizing enzyme genes (SOD2, CAT).
  • HMVEC exhibited altered nitric oxide synthase and NAD(P)H oxidase expression, mitochondrial depolarization, and upregulated ROS-neutralizing enzyme genes (SOD1, GPX1, TXNRD1, TXNRD2).

Conclusions:

  • Hyperglycemia induces distinct endothelial dysfunction pathways in different cell types.
  • HMVEC display a higher degree of gene expression changes, supporting the microvasculature's role in vascular metabolic memory.
  • Identifying cell-specific genomic and functional changes offers a systems biology approach for therapeutic interventions.

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