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Further observations on the effect of galactose on the development of X-ray-induced cataract in mice
Abstract:
The effect of a 30% galactose diet on the progression of X-ray-induced cataract in mice was evaluated by following morphological changes as seen by light and transmission electron microscopy in different regions of the lens. Lens opacities as observed with the slit-lamp biomicroscope developed at a slower rate in galactose-fed animals than in those on a normal diet. The protective effect of galactose on X-ray cataract was seen whether galactose feeding was initiated either 1 week before or after exposure to X-ray. At 4 months after X-ray approximately 50% of galactose-fed animals had mature cataracts, compared to 100% in the control group. Similarly, at two weeks after exposure to X-ray, before any lens opacities were observed, morphological changes were more severe in the control group; cells in the meridional row were more disorganized in the control than in the galactose-fed groups. However, the progression of mature cataracts in the two galactose-fed groups were not significantly different. Since free radicals produced by X-ray are thought to be short-lived, the protective effect of galactose feeding after X-ray was unexpected, raising the possibility that some of the active species may be long-lasting. The nature of such radicals, if any, is unknown and remains to be investigated.
Insights
A galactose diet slowed the progression of X-ray-induced cataracts in mice, offering protection even when initiated after radiation exposure. This suggests a potential protective role for galactose in mitigating radiation-induced lens damage.
Area of Science:
- Ophthalmology
- Radiation Biology
- Nutritional Science
Background:
- X-ray radiation is a known inducer of cataract formation.
- Dietary interventions are being explored for their potential to mitigate radiation damage.
- Galactose metabolism and its role in ocular health require further investigation.
Purpose of the Study:
- To investigate the effect of a 30% galactose diet on X-ray-induced cataract progression in mice.
- To evaluate the protective potential of galactose, regardless of feeding initiation timing relative to X-ray exposure.
Main Methods:
- Mice were fed a 30% galactose diet or a normal diet.
- Cataract induction was achieved using X-ray irradiation.
- Morphological changes in the lens were assessed using light and transmission electron microscopy, and slit-lamp biomicroscopy.
Main Results:
- Galactose-fed mice exhibited a slower rate of lens opacity development compared to controls.
- A protective effect was observed whether galactose feeding started before or after X-ray exposure.
- At 4 months post-X-ray, 50% of galactose-fed mice had mature cataracts versus 100% of controls.
Conclusions:
- A galactose-rich diet demonstrates a protective effect against X-ray-induced cataracts in mice.
- The protective mechanism may involve mitigating early morphological changes in lens cells.
- The unexpected efficacy of post-exposure galactose feeding suggests potential long-lasting reactive species involved in radiation damage.