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Related Concept Videos

Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

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An Assay to Detect Protection of the Retinal Vasculature from Diabetes-Related Death in Mice
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Partial rescue of retinal function in chronically hypoglycemic mice.

Yumiko Umino1, Nicolas Cuenca, Drew Everhart

  • 1Center for Vision Research and SUNY Eye Institute, Department of Ophthalmology, SUNY Upstate Medical University, Syracuse, New York 13210, USA.

Investigative Ophthalmology & Visual Science
|January 11, 2012
PubMed
Summary

Dietary glucose improved retinal function in mice with glucagon receptor gene mutations, but did not restore lost synaptic connections. This suggests retinal neurons can recover function despite synaptic loss.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Metabolic Research

Background:

  • Glucagon receptor gene (Gcgr) null mutation in mice causes late-onset retinal degeneration and vision loss.
  • Acute hyperglycemia does not restore vision, suggesting irreversible damage.

Purpose of the Study:

  • To determine if long-term high dietary glucose can rescue retinal function and circuit connectivity in aged Gcgr-/- mice.
  • Investigate the impact of chronic hypoglycemia on retinal structure and function.

Main Methods:

  • Gcgr-/- mice received a carbohydrate-rich diet from 12 months of age for 1 month.
  • Retinal function was assessed using electroretinographic (ERG) recordings.
  • Retinal structure, including synaptic integrity, was evaluated via immunohistochemistry.

Main Results:

  • Carbohydrate-rich diet normalized blood glucose levels in Gcgr-/- mice, improving ERG b-wave sensitivity approximately 10-fold.
  • Retinal function recovery occurred despite a 20% reduction in rod-to-bipolar cell synapses.
  • Lost synapses, primarily apical ones in the outer plexiform layer, were not reestablished by the diet.

Conclusions:

  • Prolonged diet-induced euglycemia enhances retinal function but does not restore synaptic contacts lost due to chronic hypoglycemia.
  • Retinal neurons may possess homeostatic mechanisms enabling functional recovery despite synaptic loss.
  • This highlights a potential therapeutic window for managing vision impairment in metabolic disorders.