Abstract
Circadian influences on growth and development in response to ethanol were studied in mice. On gestational day 10, pregnant animals received a single intraperitoneal injection of ethanol with the following dose levels: 1.0, 2.5 or 4.0 g/kg at one of four circadian phases (0700, 1300, 1900 or 0100 hr). 48 hrs after injection the embryonic weight and length, protein and DNA content and placental weight and protein were determined. Ethanol-related intrauterine growth retardation were shown to be dose- and circadian phase-dependent, the greatest susceptibility being seen during the dark phase. The variations observed are discussed with regard to changes in drug metabolism and tissue sensitivity.
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