Reduced ethanol withdrawal severity and altered withdrawal-induced c-fos expression in various brain regions of mice lacking protein kinase C-epsilon

Neuroscience
M F OliveC W Hodge

Abstract

Withdrawal from chronic ethanol consumption can be accompanied by motor seizures, which may be a result of altered GABA(A) receptor function. Recently, we have generated and characterized mice lacking the epsilon isoform of protein kinase C as being supersensitive to the behavioral and biochemical effects of positive GABA(A) receptor allosteric modulators, including ethanol. The aim of the present study was to determine whether protein kinase C-epsilon null mutant mice display altered seizure severity during alcohol withdrawal. In addition, we used c-fos immunohistochemistry immediately following seizure assessment to identify potential brain regions involved in any observed differences in withdrawal severity. Mice were allowed to consume an ethanol-containing or control liquid diet as the sole source of food for 14 days. During the 7-h period following removal of the diet, both ethanol-fed wild-type and protein kinase C-epsilon null mutant mice displayed an overall increase in Handling-Induced Convulsion score versus control-fed mice. However, at 6 and 7h following diet removal, the Handling-Induced Convulsion score was reduced in ethanol-fed protein kinase C-epsilon null mutant mice compared to ethanol-fed wild-type mice. Eth...Continue Reading

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