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Related Experiment Videos

Formate-induced alterations in retinal function in methanol-intoxicated rats

J T Eells1, M M Salzman, M F Lewandowski

  • 1Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee 53226, USA.

Toxicology and Applied Pharmacology
|September 1, 1996
PubMed
Summary

Formic acid, a methanol metabolite, directly damages the retina. Both acute high-level and chronic low-level formate exposure can cause vision problems and retinal changes in rats.

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Therapeutic photobiomodulation for methanol-induced retinal toxicity.

Proceedings of the National Academy of Sciences of the United States of America·2003

Area of Science:

  • Toxicology
  • Neuroscience
  • Ophthalmology

Background:

  • Methanol poisoning can cause permanent visual damage.
  • Formic acid is the toxic metabolite responsible for methanol toxicity.
  • Limited data exists on chronic low-level methanol exposure's retinal toxicity.

Purpose of the Study:

  • Compare retinal effects of acute vs. chronic formate exposure.
  • Investigate formic acid as a direct retinal toxin.
  • Determine if low-level formate exposure causes visual system toxicity.

Main Methods:

  • Rats exposed to high formate (8-15 mM) or low formate (4-6 mM) for 48 hours.
  • Assessed retinal function via electroretinogram (ERG).
  • Examined retinal structure through histopathology.

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Main Results:

  • High formate levels (8-15 mM) caused metabolic acidosis, ERG dysfunction, and retinal pathology (vacuolation).
  • Lower formate levels (4-6 mM) for 48 hours induced ERG dysfunction without acidosis or pathology.
  • Formic acid acts as a direct retinal toxin in methanol intoxication.

Conclusions:

  • Both acute and chronic methanol exposure can lead to retinal dysfunction.
  • Formate-induced visual toxicity shares a common mechanism across different exposure types.
  • Findings support clinical observations of methanol's visual system effects.