Insulin rescues amyloid β-induced impairment of hippocampal long-term potentiation
Abstract
Cerebral accumulation of amyloid beta-protein (Abeta) is generally believed to play a critical role in the pathogenesis of Alzheimer's disease (AD). Recent evidence suggests that Abeta-induced synaptic dysfunction is one of earliest pathogenic events observed in AD. Here we report that synthetic Abeta(1-42) strongly inhibited the induction of long-term potentiation (LTP) in the CA1 region of rat hippocampal slices. To ascertain which Abeta(1-42) sequences contribute to the impairment of LTP, we compared actions of several Abeta fragments and found that the sequence within 25-35 region of Abeta mainly contributes to the expression of LTP impairment. Importantly, we show that insulin and insulin-like growth factor-1 significantly inhibit Abeta oligomer formation, particularly dimers and trimers, and ameliorate the synthetic Abeta-induced suppression of LTP. Furthermore, dithiothreitol was found to be capable of significantly preventing the inhibitory effect of insulin on Abeta oligomer formation. In contrast, hemoglobin promotes Abeta oligomer formation and enhances Abeta-mediated inhibition of LTP induction. These results suggest that insulin may have utility in treating the earliest stages of Abeta-induced synaptic dysfunction in AD patients.
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Insulin ameliorates Aβ oligomer-induced inhibition of long-term potentiation.
“it was recently shown that insulin ameliorates Aβ oligomer-induced inhibition of LTP (Lee et al., 2009).”
From The Aβ oligomer hypothesis for synapse failure and memory loss in Alzheimer’s disease (2011) · cites this paper as Lee et al., 2009
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- Authors
- Lee, C.-C., Kuo, Y.-M., Huang, C.-C., & Hsu, K.-S.
- Affiliations
- National Cheng Kung University (TW)
- Corresponding author
- Hsu, Kuei-Sen
- Venue
- Neurobiology of Aging
- Publisher
- Elsevier BV
- Published
- 2009-03
- Volume
- 30
- Issue
- 3
- Pages
- 377-387
- ISSN
- 0197-4580 (ISSN-L)
- OpenAlex
- W1993019632
- Cited by
- 81
- References
- 64
- Citations by year
- 2025: 3 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 6 · 2020: 2 · 2019: 5 · 2018: 7 · 2017: 3 · 2016: 5 · 2015: 3 · 2014: 5 · 2013: 6 · 2012: 8
- FWCI
- 3.12
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurobiology of Aging (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Council
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- insulin, amyloid-beta, Alzheimer's disease, long-term potentiation, hippocampus, CA1, synaptic dysfunction, insulin-like growth factor I, amyloid-beta 42, dithiothreitol, hemoglobin
- MeSH terms
- Animals, Hippocampus, Insulin, Male, Organ Culture Techniques, Amyloid beta-Peptides, Rats, Sprague-Dawley, Long-Term Potentiation, Rats
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