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Inhibition of experimental intraocular proliferation with intravitreous 5-fluouracil. A transmission
Abstract:
5-Fluouracil, administered at concentrations of 1 and 5 mg to inhibit experimental intraocular proliferation produced by intravitreously implanted fibroblasts in rabbits, produced tissue alterations revealed by TEM. The degranulation and migration of pigment epithelial cells, the incipient degradation of axons and myelin sheets, the migration of glial cells and the prominent edema of the inner layers indicated a non-negligible damage to the retina, suggesting to abstain from its use in human eyes and to search for less neurotoxic drugs, possessing the same inhibitory effect on intraocular proliferation.
Insights
5-Fluorouracil (5-FU) caused significant retinal damage in rabbits, including pigment epithelial cell changes and axonal degradation. Researchers suggest avoiding 5-FU in human eyes due to its neurotoxicity and seeking safer anti-proliferative drugs.
Area of Science:
- Ophthalmology
- Toxicology
- Cell Biology
Background:
- Intraocular proliferation can lead to vision-threatening conditions.
- Fibroblast-induced proliferation is a model for studying ocular tissue response.
- 5-Fluorouracil (5-FU) is a chemotherapeutic agent with potential anti-proliferative effects.
Purpose of the Study:
- To evaluate the retinal toxicity of 5-Fluorouracil (5-FU) in a rabbit model.
- To assess the effects of 5-FU on experimentally induced intraocular proliferation.
Main Methods:
- Rabbits received intravitreal injections of fibroblasts to induce proliferation.
- 5-Fluorouracil (5-FU) was administered at concentrations of 1 mg and 5 mg.
- Retinal tissues were examined using Transmission Electron Microscopy (TEM) to identify cellular alterations.
Main Results:
- TEM revealed significant retinal tissue alterations, including pigment epithelial cell degranulation and migration.
- Evidence of axonal and myelin sheath degradation was observed.
- Glial cell migration and prominent edema in retinal inner layers indicated substantial damage.
Conclusions:
- 5-Fluorouracil (5-FU) demonstrates considerable neurotoxicity to the retina.
- Its use in human intraocular applications should be avoided.
- Development of less neurotoxic drugs with similar anti-proliferative efficacy is recommended.