Lenticular opacities in young rats as a consequence of maternal diets low in tryptopham and/or vitamin E
Insights
A combined maternal diet low in tryptophan and vitamin E significantly increased fetal lens opacities in offspring. Restricting only one nutrient showed minimal effects, highlighting a critical interaction for lens development.
Area of Science:
- Nutritional Science
- Developmental Biology
- Ophthalmology
Background:
- Lens transparency is crucial for vision.
- Nutritional deficiencies during development can impact fetal growth and organogenesis.
- Tryptophan and Vitamin E are essential nutrients with known roles in cellular health.
Purpose of the Study:
- To investigate the impact of combined maternal dietary restriction of tryptophan and vitamin E on fetal lens development.
- To compare the effects of combined nutrient restriction versus single nutrient restriction on lens transparency.
- To identify potential synergistic or antagonistic effects of tryptophan and vitamin E on fetal eye development.
Main Methods:
- Maternal diets were manipulated during gestation and lactation to restrict tryptophan and/or vitamin E.
- Offspring (progeny) were assessed at weaning for the presence of unilateral or bilateral lenticular opacities.
- Incidence rates of lens opacities were compared across different dietary groups.
Main Results:
- A maternal diet deficient in both tryptophan and vitamin E resulted in a 33% incidence of lens opacities in 126 progeny.
- Maternal restriction of tryptophan alone led to no observed lens opacities in 179 progeny.
- Maternal restriction of vitamin E alone resulted in a 6% incidence of lens opacities.
Conclusions:
- A combined deficiency in maternal tryptophan and vitamin E poses a significant risk for fetal lens development, leading to opacities.
- Tryptophan and vitamin E exhibit a previously unrecognized synergistic relationship in preventing fetal lens opacities.
- These findings underscore the importance of balanced maternal nutrition for optimal fetal eye development.
Abstract:
The relative effect upon lens transparency of a diet low in both tryptophan and vitamin E was compared to diets low in either nutrient alone during development. Thirty-three percent of 126 progeny from 19 litters at weaning were found to have either unilateral or bilateral lenticular opacities when the maternal diet during gestation and lactation provided only 75 mg L-tryptophan and 0.1 mg dl-alpha-tocopheryl acetate per 100 g diet. No opacities were seen in 179 progency from 20 litters when tryptophan alone was restricted, and only 6% incidence was detected when vitamin E was the sole limiting nutrient. The data reveal a previously unrecognized association between tryptophan and vitamin E relative to fetal lens development.
