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- W2006202047 abstract "Long-term memory formation for a passive avoidance task in one-day-old chicks requires a late phase of synaptic glycoprotein synthesis (including the neural cell adhesion molecule), commencing 5.5 h post-training. This phase occurred in chicks trained with a strong, but not a weak aversant, which only retained this memory for a few hours (10). In addition, previous work has shown that a corticosteroid action through central corticosteroid receptors is also required for long-term passive avoidance memory. Here, we tested the hypothesis that the corticosteroid action on memory formation might be exerted via modulation of the late phase of neural glycoprotein synthesis. One-day-old chicks were used as experimental subjects. Incorporation of the radiolabelled glycoprotein precursor [3H]fucose into synaptic membranes of the chick forebrain was used as an index of glycoprotein fucosylation. Bilateral intracerebral injections of a corticosterone dose (0.5 μg/hemisphere) that facilitates long-term retention of weak learning were able to induce the late phase of glycoprotein synthesis in undisturbed chicks. A further experiment examined the effect of antibodies against the neural cell adhesion molecule on the facilitatory action of corticosterone on long-term memory for the weak passive avoidance training. Chicks trained on a weak aversant were injected with corticosterone (0.5 μg/hemisphere) 30 min post-training and testing occurred 24 h post-training. Administration of the neural cell adhesion molecule antibodies during the late phase (5.5 h post-training) blocked the facilitatory action of corticosterone on long-term memory. These findings further support the view that corticosteroids have a role in memory consolidation. In addition to previously proposed effects on gene transcription, these data suggest a post-translational glycosylation mechanism for the modulatory effect of corticosteroids on long-term memory formation." @default.
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- W2006202047 date "1995-12-01" @default.
- W2006202047 modified "2023-09-24" @default.
- W2006202047 title "Corticosterone facilitates long-term memory formation via enhanced glycoprotein synthesis" @default.
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- W2006202047 doi "https://doi.org/10.1016/0306-4522(95)00306-4" @default.
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