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Neprilysin-sensitive Synapse-associated Amyloid-β Peptide Oligomers Impair Neuronal Plasticity and Cognitive Function
Open accessAbstract
A subtle but chronic alteration in metabolic balance between amyloid-beta peptide (Abeta) anabolic and catabolic activities is thought to cause Abeta accumulation, leading to a decade-long pathological cascade of Alzheimer disease. However, it is still unclear whether a reduction of the catabolic activity of Abeta in the brain causes neuronal dysfunction in vivo. In the present study, to clarify a possible connection between a reduction in neprilysin activity and impairment of synaptic and cognitive functions, we cross-bred amyloid precursor protein (APP) transgenic mice (APP23) with neprilysin-deficient mice and biochemically and immunoelectron-microscopically analyzed Abeta accumulation in the brain. We also examined hippocampal synaptic plasticity using an in vivo recording technique and cognitive function using a battery of learning and memory behavior tests, including Y-maze, novel-object recognition, Morris water maze, and contextual fear conditioning tests at the age of 13-16 weeks. We present direct experimental evidence that reduced activity of neprilysin, the major Abeta-degrading enzyme, in the brain elevates oligomeric forms of Abeta at the synapses and leads to impaired hippocampal synaptic plasticity and cognitive function before the appearance of amyloid plaque load. Thus, reduced neprilysin activity appears to be a causative event that is at least partly responsible for the memory-associated symptoms of Alzheimer disease. This supports the idea that a strategy to reduce Abeta oligomers in the brain by up-regulating neprilysin activity would contribute to alleviation of these symptoms.
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Cites
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Cited by
Soluble protein oligomers in neurodegeneration: lessons from the Alzheimer's amyloid β-peptide
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Synapse Loss and Microglial Activation Precede Tangles in a P301S Tauopathy Mouse Model
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Metadata
- Authors
- Huang, S.-M., Mouri, A., Kokubo, H., Nakajima, R., Suemoto, T., Higuchi, M., Staufenbiel, M., Noda, Y., Yamaguchi, H., Nabeshima, T., Saido, T. C., & Iwata, N.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2006-06
- Volume
- 281
- Issue
- 26
- Pages
- 17941-17951
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1972565866
- Cited by
- 181
- References
- 20
- FWCI
- 8.23
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Huang, S.-M., Mouri, A., Kokubo, H., Nakajima, R., Suemoto, T., Higuchi, M., Staufenbiel, M., Noda, Y., Yamaguchi, H., Nabeshima, T., Saido, T. C., & Iwata, N. (2006). Neprilysin-sensitive Synapse-associated Amyloid-β Peptide Oligomers Impair Neuronal Plasticity and Cognitive Function. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m601372200
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
