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High concentrations of glucose induce synthesis of argpyrimidine in retinal endothelial cells

P S Padayatti1, C Jiang, M A Glomb

  • 1Center for Vision Research, Department of Ophthalmology and Center for Diabetes Research, Case Western Reserve University and University Hospitals of Cleveland, Cleveland, OH, USA.

Current Eye Research
|February 13, 2002
PubMed
Abstract

Insights

High glucose levels in bovine retinal endothelial cells increase intracellular methylglyoxal (MG) and MG-derived advanced glycation end products (AGEs), such as argpyrimidine. This suggests a role for MG in diabetic retinopathy pathogenesis.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Ophthalmology

Background:

  • Diabetic retinopathy is a leading cause of vision loss.
  • Advanced glycation end products (AGEs) are implicated in diabetic complications.
  • Methylglyoxal (MG) is a reactive dicarbonyl compound that can form AGEs.

Purpose of the Study:

  • To investigate if high glucose concentrations induce intracellular methylglyoxal (MG) production in bovine retinal endothelial cells (BRE cells).
  • To determine if MG leads to the formation of MG-derived advanced glycation end products (AGEs) in BRE cells.
  • To explore the potential role of MG-mediated protein modification in diabetic retinopathy.

Main Methods:

  • BRE cells were cultured and exposed to high D-glucose (30 mM), L-glucose (30 mM), or control (5 mM) conditions for 7 days.
  • Intracellular MG levels were assessed.
  • The MG-derived AGE, argpyrimidine, was quantified in cell fractions using competitive ELISA and immunofluorescence.

Main Results:

  • High D-glucose significantly increased intracellular MG levels in BRE cells compared to controls and L-glucose treated cells.
  • D-glucose significantly enhanced argpyrimidine synthesis in both supernatant and pellet fractions.
  • Immunofluorescence confirmed higher argpyrimidine levels in cells exposed to high D-glucose.

Conclusions:

  • Elevated glucose concentrations promote MG production and subsequent MG-mediated protein modification (AGE formation) in retinal endothelial cells.
  • These findings suggest that MG-mediated AGEs may contribute to endothelial cell dysfunction in diabetic retinopathy.
  • Targeting MG or its AGEs could be a potential therapeutic strategy for diabetic retinopathy.

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