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Chicks injected with antisera to either S-100 alpha or S-100 beta protein develop amnesia for a passive avoidance
1Department of Physiology and Pharmacology, University of Queensland, Brisbane, Australia. b.odowd@vthrc.uq.edu.au
Neurobiology of Learning and Memory
|May 1, 1997
Summary
The alpha and beta subunits of S-100 protein play distinct roles in memory consolidation. Blocking S-100 alpha after learning impairs memory later, while blocking S-100 beta affects memory earlier.
Area of Science:
- Neuroscience
- Molecular Biology
- Animal Behavior
Background:
- S-100 beta protein is linked to memory processes and upregulated in Alzheimer's and Down's syndromes.
- The role of the S-100 alpha subunit in memory has not been previously investigated.
Purpose of the Study:
- To investigate the involvement of S-100 alpha and S-100 beta subunits in memory formation.
- To determine the specific timing of S-100 subunit involvement in memory consolidation.
Main Methods:
- Day-old chicks (Gallus domesticus) were trained on a one-trial passive avoidance task.
- Monoclonal antisera targeting S-100 alpha or S-100 beta were injected intracranially immediately after training.
- Control groups received antisera to carbonic anhydrase or saline.
Main Results:
- Both S-100 alpha and S-100 beta antisera significantly reduced memory retention compared to controls (p < .01).
- S-100 alpha antisera caused amnesia when injected 0-20 minutes post-training, affecting memory transition phases.
- S-100 beta antisera induced amnesia when injected pre-training or immediately post-training, impacting earlier memory phases.
Conclusions:
- The alpha and beta subunits of S-100 protein are differentially required for passive avoidance memory consolidation.
- S-100 alpha and S-100 beta subunits participate at distinct temporal stages in the memory consolidation process.