Late-long-term potentiation magnitude, but not Aβ levels and amyloid pathology, is associated with behavioral performance in a rat knock-in model of Alzheimer disease
Open accessAbstract
Cleavage of Amyloid precursor protein by β- and γ-secretases lead to Aβ formation. The widely accepted pathogenic model states that these mutations cause AD via an increase in Aβ formation and accumulation of Aβ in Amyloid plaques. APP mutations cause early onset familial forms of Alzheimer’s disease (FAD) in humans. We generated App−Swedish (App s) knock−in rats, which carry a pathogenic APP mutation in the endogenous rat App gene. This mutation increases β-secretase processing of APP leading to both augmented Aβ production and facilitation of glutamate release in App s/s rats, via a β-secretase and APP−dependent glutamate release mechanism. Here, we studied 11 to 14-month-old male and female App s/s rats. To determine whether the Swedish App mutation leads to behavioral deficits, App s/s knock-in rats were subjected to behavioral analysis using the IntelliCage platform, an automated behavioral testing system. This system allows behavioral assessment in socially housed animals reflecting a more natural, less stress-inducing environment and eliminates experimenter error and bias while increasing precision of measurements. Surprisingly, a spatial discrimination and flexibility task that can reveal deficits in higher order brain function showed that App s/s females, but not App s/s male rats, performed significantly worse than same sex controls. Moreover, female control rats performed significantly better than control and App s/s male rats. The Swedish mutation causes a significant increase in Aβ production in 14-month-old animals of both sexes. Yet, male and female App s/s rats showed no evidence of AD−related amyloid pathology. Finally, App s/s rats did not show signs of significant neuroinflammation. Given that the APP Swedish mutation causes alterations in glutamate release, we analyzed Long-term potentiation (LTP), a long-lasting form of synaptic plasticity that is a cellular basis for learning and memory. Strikingly, LTP was significantly increased in App s/s control females compared to both App s/s sexes and control males. In conclusion, this study shows that behavioral performances are sex and App-genotype dependent. In addition, they are associated with LTP values and not Aβ or AD-related pathology. These data, and the failures of anti-Aβ therapies in humans, suggest that alternative pathways, such as those leading to LTP dysfunction, should be targeted for disease-modifying AD therapy.
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The Apph allele enables the physiological production of human Aβ instead of rodent Aβ from the endogenous rat App gene.
“The Apph allele enables the physiological production of human Aβ instead of rodent Aβ from the endogenous rat App gene [43–49].”
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- Authors
- Yesiltepe, M., Yin, T., Tambini, M. D., Breuillaud, L., Zehntner, S. P., & D’Adamio, L.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- Venue
- Frontiers in Aging Neuroscience
- Publisher
- Frontiers Media SA
- Published
- 2022-11-11
- Volume
- 14
- Pages
- 1040576-1040576
- ISSN
- 1663-4365 (ISSN-L)
- PMC
- PMC9691854
- OpenAlex
- W4308801878
- Cited by
- 6
- References
- 43
- Citations by year
- 2026: 2 · 2024: 2 · 2023: 2
- FWCI
- 0.62
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Aging Neuroscience (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institute on Aging
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- Alzheimer's disease, APP Swedish mutation, amyloid-beta, long-term potentiation, sex differences, spatial discrimination, behavioral deficits, glutamate release, synaptic plasticity, neuroinflammation, amyloid plaques
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