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- W2010070950 abstract "The dynorphin opioid peptides control glutamate neurotransmission in the hippocampus. Alcohol-induced dysregulation of this circuit may lead to impairments in spatial learning and memory. This study examines whether changes in the hippocampal dynorphin and glutamate systems are related, and contribute to impairment of spatial learning and memory in a rat model of cognitive deficit associated with alcohol binge drinking. Hippocampal dynorphins (radioimmunoassay) and glutamate (in vivo microdialysis) were analyzed in Wistar rats exposed to repeated moderate-dose ethanol bouts that impair spatial learning and memory in the Water Maze Task (WMT). The highly selective, long-acting κ-opioid receptor (KOR) antagonist nor-binaltorphimine (nor-BNI) was administered systemically or into the hippocampal CA3 region to test a role of dynorphins in alcohol-induced dysregulations in glutamate neurotransmission and behavior in the WMT. The ethanol treatment impaired learning and memory, upregulated dynorphins and increased glutamate overflow in the CA3 region. Administration of nor-BNI after cessation of ethanol exposure reversed ethanol-induced changes in glutamate neurotransmission in animals exposed to ethanol and normalized their performance in the WMT. The findings suggest that impairments of spatial learning and memory by binge-like ethanol exposure are mediated through the KOR activation by upregulated dynorphins resulting in elevation in glutamate levels. Selective KOR antagonists may correct alcohol-induced pathological processes, thus representing a novel pharmacotherapy for treating of ethanol-related cognitive deficits." @default.
- W2010070950 created "2016-06-24" @default.
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- W2010070950 date "2013-10-08" @default.
- W2010070950 modified "2023-10-03" @default.
- W2010070950 title "Upregulated dynorphin opioid peptides mediate alcohol-induced learning and memory impairment" @default.
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- W2010070950 doi "https://doi.org/10.1038/tp.2013.72" @default.
- W2010070950 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3818015" @default.
- W2010070950 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24105441" @default.
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