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Related Experiment Video

Updated: Jun 17, 2026

Retinal Pathophysiological Evaluation in a Rat Model
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Retinal Pathophysiological Evaluation in a Rat Model

Published on: May 6, 2022

Retinal vascular changes after glial disruption in rats.

Weiyong Shen1, Shiying Li, Sook Hyun Chung

  • 1Save Sight Institute, University of Sydney, Sydney, Australia. shenw@med.usyd.edu.au

Journal of Neuroscience Research
|December 24, 2009
PubMed
Summary

Glial dysfunction contributes to blood-retinal barrier breakdown in retinal vascular diseases. Disrupting glial cells, like Müller cells, with DL-alpha-aminoadipic acid (DL-alpha-AAA) or siRNA targeting glutamine synthetase (GS) caused vascular damage.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vascular Biology

Background:

  • Glial cells play crucial roles in maintaining the blood-retinal barrier (BRB).
  • Glial dysfunction is implicated in retinal vascular diseases, but its direct role in BRB breakdown is unclear.

Purpose of the Study:

  • To investigate the hypothesis that glial dysfunction is a primary cause of blood-retinal barrier breakdown in retinal vascular diseases.
  • To determine the specificity of DL-alpha-aminoadipic acid (DL-alpha-AAA) as a glial toxin and its effects on retinal vasculature.

Main Methods:

  • In vitro assessment of DL-alpha-AAA toxicity on ocular cells.
  • In vivo studies in rats involving intraocular injection of DL-alpha-AAA or siRNA targeting glutamine synthetase (GS).
  • Analysis of glial cell disruption, vascular changes (telangiectasis, permeability), and protein expression (GS, GFAP, vimentin, VEGF, claudin-5) using immunohistochemistry and confocal microscopy.

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Last Updated: Jun 17, 2026

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Oxygen-Induced Retinopathy Model for Ischemic Retinal Diseases in Rodents
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Published on: September 16, 2020

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Main Results:

  • DL-alpha-AAA selectively damaged astrocytes and Müller cells in vitro.
  • Intraocular DL-alpha-AAA injection in rats led to glial cell disruption, vascular telangiectasis, and increased vascular permeability.
  • Vascular changes correlated with glial disruption, reduced glutamine synthetase (GS) expression, and altered glial fibrillary acidic protein (GFAP) and vimentin levels.
  • GS siRNA injection induced similar Müller cell changes and BRB breakdown.

Conclusions:

  • Glial dysfunction, particularly in Müller cells, is a significant contributor to blood-retinal barrier breakdown.
  • Targeting glial cells offers a potential therapeutic avenue for retinal vascular diseases.