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Published on: May 12, 2015
Hippocampal GluA1 expression in Gria1-/- mice only partially restores spatial memory performance deficits
Florian Freudenberg1, Evgeny Resnik2, Alexander Kolleker2
1Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Heinrich-Hoffmann-Straße 10, 60528 Frankfurt am Main, Germany; Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany.
Restoring GluA1 in the hippocampus partially improved spatial working memory (SWM) in deficient mice. However, deficits remained, suggesting extra-hippocampal GluA1 is also crucial for SWM.
Area of Science:
- Neuroscience
- Cognitive Science
- Molecular Biology
Background:
- Spatial working memory (SWM) is vital for survival and relies on hippocampal function.
- GluA1 subunit of AMPA receptors is critical for SWM, as shown by impaired performance in Gria1-/- mice.
Purpose of the Study:
- To investigate the role of hippocampal GluA1 in SWM using viral gene transfer for targeted re-expression.
- To determine if restoring hippocampal GluA1 can rescue SWM deficits in Gria1-/- mice.
Main Methods:
- Viral gene transfer was used to re-express GluA1 specifically in the hippocampus of Gria1-/- mice (Gria1Hpc mice).
- Behavioral testing included the Y-maze spatial novelty preference and a rewarded alternation T-maze task to assess SWM and other behaviors (anxiety, hyperactivity).
Main Results:
- Gria1Hpc mice showed reduced anxiety and hyperactivity compared to Gria1-/- mice.
- SWM was partially improved in the Y-maze task but remained significantly impaired in the T-maze task.
- Hippocampal GluA1 re-expression modulated several behaviors, but did not fully restore SWM.
Conclusions:
- Hippocampal GluA1 plays a role in modulating anxiety, hyperactivity, and SWM.
- Complete restoration of SWM in Gria1-/- mice requires more than just hippocampal GluA1.
- Both hippocampal and extra-hippocampal GluA1-containing AMPA receptors contribute to spatial working memory.
