A reduction in hippocampal GABA A receptor α5 subunits disrupts the memory for location of objects in mice
Open accessAbstract
The memory for location of objects, which binds information about objects to discrete positions or spatial contexts of occurrence, is a form of episodic memory particularly sensitive to hippocampal damage. Its early decline is symptomatic for elderly dementia. Substances that selectively reduce alpha5-GABA(A) receptor function are currently developed as potential cognition enhancers for Alzheimer's syndrome and other dementia, consistent with genetic studies implicating these receptors that are highly expressed in hippocampus in learning performance. Here we explored the consequences of reduced GABA(A)alpha5-subunit contents, as occurring in alpha5(H105R) knock-in mice, on the memory for location of objects. This required the behavioral characterization of alpha5(H105R) and wild-type animals in various tasks examining learning and memory retrieval strategies for objects, locations, contexts and their combinations. In mutants, decreased amounts of alpha5-subunits and retained long-term potentiation in hippocampus were confirmed. They exhibited hyperactivity with conserved circadian rhythm in familiar actimeters, and normal exploration and emotional reactivity in novel places, allocentric spatial guidance, and motor pattern learning acquisition, inhibition and flexibility in T- and eight-arm mazes. Processing of object, position and context memories and object-guided response learning were spared. Genotype difference in object-in-place memory retrieval and in encoding and response learning strategies for object-location combinations manifested as a bias favoring object-based recognition and guidance strategies over spatial processing of objects in the mutants. These findings identify in alpha5(H105R) mice a behavioral-cognitive phenotype affecting basal locomotion and the memory for location of objects indicative of hippocampal dysfunction resulting from moderately decreased alpha5-subunit contents.
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α5GABAARs have been implicated most consistently in memory, with knockdown, knockout, or pharmacological suppression of α5GABAARs leading to improvements in learning and memory.
“α5GABAARs, which are expressed most intensively in the hippocampus and deep layers of cortex, have been implicated most consistently in memory, with knockdown, knockout, or pharmacological suppression of α5GABAARs leading to improvements in learning and memory [56-61].”
From An emerging circuit pharmacology of GABAA receptors (2018) · cites this paper as [59]
There is evidence supporting a critical role for α5GABAARs in certain memory processes.
“However, there is also some evidence supporting a critical role for α5GABAARs in certain memory processes [78, 59].”
From An emerging circuit pharmacology of GABAA receptors (2018) · cites this paper as [59]
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- Authors
- Prut, L., Prenosil, G., Willadt, S., Vogt, K., Fritschy, J. ‐., & Crestani, F.
- Affiliations
- Novartis (Switzerland) (CH)
- University of Basel (CH)
- University of Zurich (CH)
- Corresponding author
- Crestani, F.
- Venue
- Genes, Brain and Behavior
- Publisher
- Wiley
- Published
- 2010-07
- Volume
- 9
- Issue
- 5
- Pages
- 478-488
- ISSN
- 1601-183X (ISSN-L)
- 1601-1848
- OpenAlex
- W2008698177
- Cited by
- 53
- References
- 47
- Citations by year
- 2026: 2 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 8 · 2018: 5 · 2017: 4 · 2016: 4 · 2015: 4 · 2014: 4 · 2013: 2 · 2012: 6
- FWCI
- 2.51
- Type
- journal article
- Language
- en
- Open access
- green
- www.zora.uzh.ch
- Licence
- Locations
- Genes Brain & Behavior (publishedVersion)
- PubMed (publishedVersion)
- Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, other-oa)
- Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
- Zurich Open Repository and Archive (University of Zurich)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Keywords
- hippocampus, spatial memory, episodic memory, long-term potentiation, hyperactivity, circadian rhythm, learning strategies, Alzheimer's disease, dementia, nootropic drugs
- MeSH terms
- Animals, Choice Behavior, Discrimination Learning, Exploratory Behavior, Female, Hippocampus, Memory, Mice, Neurologic Mutants, Receptors, GABA-A, Long-Term Potentiation, Maze Learning, Mice, Gene Knock-In Techniques
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