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[Developmental eye abnormalities in mouse fetuses induced by retinoic acid]
1Department of Ophthalmology, Nagoya City University Medical School, Aichi-ken, Japan.
Nippon Ganka Gakkai Zasshi
|April 1, 1997
Summary
Retinoic acid exposure during pregnancy causes significant neural crest cell migration defects, leading to severe ocular anomalies in mouse offspring. These include microphthalmos, anophthalmos, and faulty embryonic fissure closure.
Area of Science:
- Developmental biology
- Teratology
- Ophthalmology
Context:
- Neural crest cells are crucial for craniofacial and ocular development.
- Retinoic acid is a known teratogen that can disrupt embryonic development.
- Understanding the link between teratogen exposure and birth defects is vital.
Purpose:
- To investigate the impact of retinoic acid on neural crest cell migration.
- To characterize the resulting ocular and craniofacial anomalies in mouse fetuses.
- To establish a causal relationship between abnormal neural crest cell migration and specific birth defects.
Summary:
- Pregnant mice treated with retinoic acid exhibited high fetal mortality (46.3%) compared to controls (2.2%).
- Offspring exposed to retinoic acid showed high incidences of microphthalmos (95.5%), cleft lip/palate (36.4%), and CNS anomalies (31.8%).
- Histological analysis revealed anophthalmos, faulty embryonic fissure closure, vitreous abnormalities, aphakia, goniodysgenesis, and lens separation defects due to abnormal neural crest cell migration.
Impact:
- This study highlights retinoic acid as a potent teratogen capable of inducing severe ocular and craniofacial malformations.
- The findings underscore the critical role of proper neural crest cell migration in normal eye development.
- Results provide a mechanistic understanding of how teratogen exposure can lead to specific birth defects, informing preventative strategies.