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Glutamate and Hypoxia as a Stress Model for the Isolated Perfused Vertebrate Retina
Published on: March 22, 2015
The developing mammalian retina is partially protected from gentamicin toxicity
Shiri Soudry1, Esther Zemel, Anat Loewenstein
1Department of Ophthalmology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
Experimental Eye Research
|February 17, 2009
Summary
The developing rabbit retina shows reduced susceptibility to gentamicin toxicity, with younger animals experiencing less damage. Retinal development processes may offer protection against this antibiotic.
Area of Science:
- Ophthalmology
- Toxicology
- Developmental Biology
Background:
- Gentamicin retinal toxicity is well-documented in adult animals.
- Developing retinas may have different sensitivities to toxic drugs.
- Previous studies have not assessed gentamicin toxicity in developing retinas.
Purpose of the Study:
- To evaluate the susceptibility of the developing mammalian retina to gentamicin toxicity.
- To compare the toxic effects of gentamicin on retinas at different postnatal ages.
Main Methods:
- Newborn rabbits (11-38 days old) received intravitreal gentamicin injections.
- Electroretinography (ERG) assessed retinal function 8 weeks post-injection.
- Histopathology and immunostaining (GFAP, PKC) evaluated structural damage.
Main Results:
- Minimal functional damage observed in retinas injected at 11 and 13 days.
- Increasing postnatal age correlated with increased functional and structural damage.
- Müller cells showed GFAP staining only in damaged retinas; rod bipolar cells were less affected than photoreceptors.
Conclusions:
- Developing rabbit retinas exhibit reduced susceptibility to gentamicin toxicity.
- Retinal development, including outer segment elongation, may confer protection.
- Age at injection is a critical factor in gentamicin-induced retinal damage.
