Corticosterone facilitates long-term memory formation via enhanced glycoprotein synthesis

Area of Science:

• Neuroscience
• Molecular Biology
• Memory Research

Background:

• Long-term memory consolidation involves a late phase of synaptic glycoprotein synthesis.
• Corticosteroid action via central receptors is crucial for long-term passive avoidance memory.
• The precise mechanism of corticosteroid action on memory consolidation remains to be fully elucidated.

Purpose of the Study:

• To investigate if corticosteroid action on memory formation is mediated by modulating the late phase of neural glycoprotein synthesis.
• To explore the role of neural cell adhesion molecule in corticosteroid-facilitated memory consolidation.

Main Methods:

• Assessing glycoprotein fucosylation using [3H]fucose incorporation into synaptic membranes in one-day-old chicks.
• Administering corticosterone intracerebrally to assess its effect on glycoprotein synthesis and memory retention.
• Using antibodies against the neural cell adhesion molecule to block corticosteroid effects on memory.

Main Results:

• Corticosterone administration induced the late phase of glycoprotein synthesis in undisturbed chicks.
• Antibodies against the neural cell adhesion molecule blocked the facilitatory effect of corticosterone on long-term memory for weak passive avoidance learning.
• Corticosterone's facilitatory effect on memory was observed when administered 30 min post-training and tested 24 h later.

Conclusions:

• Corticosteroids play a role in memory consolidation by modulating the late phase of neural glycoprotein synthesis.
• These findings suggest a post-translational glycosylation mechanism for corticosteroid effects on long-term memory formation.
• The neural cell adhesion molecule is implicated in the corticosteroid-mediated enhancement of memory consolidation.