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Pathogenesis of ethanol-induced limb reduction defects in mice
L E Kotch1, D B Dehart, A J Alles
1Department of Cell Biology and Anatomy, School of Medicine, University of North Carolina, Chapel Hill 27599.
Teratology
|October 1, 1992
Summary
Ethanol exposure during pregnancy causes dose-dependent limb malformations in mouse embryos. This is linked to increased cell death in the developing limb bud, particularly the apical ectodermal ridge.
Area of Science:
- Developmental Biology
- Teratology
- Toxicology
Background:
- Ethanol is a known teratogen.
- Limb malformations are a significant concern in fetal alcohol spectrum disorders.
Purpose of the Study:
- To investigate the effects of acute ethanol administration on mouse limb development.
- To identify the cellular mechanisms underlying ethanol-induced limb defects.
Main Methods:
- Pregnant C57BL/6J mice were administered ethanol (2.5-2.9 g/kg) on gestational day 9 1/4.
- Limb development and embryonic cell death patterns were analyzed.
Main Results:
- Ethanol caused dose-dependent forelimb malformations, including ectrodactyly and syndactyly.
- Increased apoptosis was observed in the apical ectodermal ridge and proximal mesenchyme within hours of ethanol exposure.
- Ethanol-induced cell death in the apical ectodermal ridge correlated with subsequent limb defects.
Conclusions:
- Acute ethanol exposure during critical developmental windows can lead to severe limb malformations.
- Ethanol-induced apoptosis in the apical ectodermal ridge is a key mechanism in the pathogenesis of these defects.