1. Ethanol-induced decrease of developmental PKC isoform expression in the embryonic chick brain.
- Author
-
McIntyre TA, Souder MG, Hartl MW, and Shibley IA
- Subjects
- Animals, Brain drug effects, Chick Embryo, Isoenzymes metabolism, Organ Size drug effects, Protein Kinase C metabolism, Brain embryology, Brain enzymology, Enzyme Inhibitors pharmacology, Ethanol pharmacology, Isoenzymes antagonists & inhibitors, Protein Kinase C antagonists & inhibitors
- Abstract
Prenatal ethanol exposure can cause a number of physiological deficits known as fetal alcohol syndrome (FAS). Because protein kinase C (PKC) regulates the cell cycle and has been linked to growth, we examined the effect of ethanol on PKC isoform expression in a developing chick brain. Ethanol exposure causes decreased head weight in chickens at day 5 in a dose-dependent manner and a decreased brain weight at days 7 and 10 at an ethanol concentration of 1.0 g/kg. Antibodies specific for PKC-alpha, beta, gamma, delta, epsilon, iota, lambda, mu and zeta were used to examine ethanol's effect on PKC expression in the growth-suppressed brain at days 5, 7 and 10 of development. Only four of the PKC isoforms tested are expressed in the chick brain prior to day 10: alpha, gamma, epsilon, and iota. PKC-alpha, gamma, and epsilon are developmentally increased during the time period studied. Ethanol causes a decreased expression of PKC-alpha on days 5, 7 and 10 and a decreased expression of PKC-gamma on days 7 and 10. Ethanol causes a decreased expression of PKC-epsilon only on day 7. PKC-iota expression is unchanged over the developmental times studied and ethanol exposure has no effect on PKC-iota expression. These data suggest that only specific PKC isoforms are developmentally expressed in the embryonic chick brain and that ethanol may inhibit the expression of those PKC isoforms that are developmentally regulated.
- Published
- 1999
- Full Text
- View/download PDF