Acute ethanol administration causes malformations but does not affect cranial morphometry in neonatal mice.
Ethanol is a known teratogen and has been implicated in the etiology of human fetal alcohol syndrome (FAS), which is characterized by distinct craniofacial abnormalities such as microcephaly, agnathia, and ocular aberrations. Attempts at quantifying the craniofacial anomalies arising from ethanol exposure have largely been limited to radiographic evaluation in postnatal rats. Such studies discount the role of the cranial soft tissue in the morphology of FAS. We present a study whose aim was to conduct measurements of the entire head including soft and hard tissue in full-term fetuses of mice by means of a digital analyzer, while at the same time comparing stained skeletal tissues in treated and untreated animals. Thirteen pregnant C57BL/6J mice were fed with 25% ethanol (vol/vol) on gestation days (E) 6, 7, and 8, whereas 10 pregnant mice received water only. Fetuses were retrieved from the animals just before delivery on E18, digitally photographed, measured, and assessed for abnormalities. Ethanol-exposed mice showed a number of abnormalities such as anophthalmia and agnathia, but these were not significantly increased over those from nontreated fetuses (P=.5). Birth weight (P=.5), crown-rump length (P=.8), and mandibular length (P=.9) were also not significantly reduced compared to control fetuses. However, defects in some cranial bones and degrees of ossification that trailed same-stage controls were observed in treated animals, at a nonstatistically significant level (P=.14). Acute maternal ingestion of alcohol in mice during pregnancy may not cause a significant increase in craniofacial or skeletal defects when evaluated at term. However, these effects may be latent, manifesting postnatally. The postnatal ability of mice for recovery from alcohol-induced birth defects deserves further investigation.
Oyedele
Olusegun Olufemi
OO
Embryonic Differentiation and Development Research Programme, School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road Parktown, Johannesburg, Gauteng, 2193 South Africa. olusegun.oyedele@wits.ac.za
Kramer
Beverley
B
D000014:Abnormalities, Drug-Induced; D000818:Animals; D000831:Animals, Newborn; D001724:Birth Weight / Q000187:drug effects; D001842:Bone and Bones / Q000002:abnormalities; D002508:Cephalometry; D019465:Craniofacial Abnormalities / Q000139:chemically induced*; D000431:Ethanol / Q000097:blood / Q000633:toxicity*; D005260:Female; D063647:Fetal Alcohol Spectrum Disorders / Q000209:etiology; D051379:Mice; D008810:Mice, Inbred C57BL; D011247:Pregnancy
D000431:Ethanol