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Updated: Apr 3, 2026

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
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Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology

Published on: March 23, 2011

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sAβPPα Improves Hippocampal NMDA-Dependent Functional Alterations Linked to Healthy Aging

Laura Moreno, Christiane Rose, Arun Mohanraj

    Journal of Alzheimer'S Disease : JAD
    |September 25, 2015
    PubMed

    Insights

    Healthy aging in rats shows decreased soluble amyloid-β protein precursor-α (sAβPPα), impairing N-methyl-D-aspartate receptor (NMDAR)-dependent long-term potentiation (LTP). Supplementing sAβPPα rescued these age-related synaptic deficits.

    Area of Science:

    • Neuroscience
    • Aging Research
    • Molecular Biology

    Background:

    • Healthy aging is associated with cognitive decline and synaptic dysfunction.
    • Soluble amyloid-β protein precursor-α (sAβPPα) plays a role in synaptic plasticity and neuronal function.
    • N-methyl-D-aspartate receptor (NMDAR)-dependent long-term potentiation (LTP) is crucial for learning and memory.

    Purpose of the Study:

    • To investigate the changes in sAβPPα and sAβPPβ levels in the aging rat hippocampus.
    • To determine the relationship between sAβPPα levels and NMDAR-dependent LTP in aged rats.
    • To explore the potential of exogenous sAβPPα to ameliorate age-related synaptic deficits.

    Main Methods:

    • Quantification of sAβPPα and sAβPPβ levels in rat hippocampal tissue.
    • Electrophysiological recordings of NMDAR-dependent LTP in hippocampal slices from young and aged rats.
    • Application of recombinant sAβPPα to aged hippocampal slices to assess its effects on NMDAR activation and LTP.

    Main Results:

    • A decrease in sAβPPα levels, but not sAβPPβ, was observed in the hippocampus of aged rats.
    • Aged rats exhibited impaired NMDAR-dependent LTP in the CA1 area.
    • Exogenous sAβPPα administration restored NMDAR activation and rescued LTP deficits in aged animals without affecting basal synaptic transmission or glutamate release.

    Conclusions:

    • Reduced synaptic sAβPPα availability contributes to age-related NMDAR deregulation and LTP impairment in the hippocampus.
    • Enhancing synaptic sAβPPα levels represents a potential therapeutic strategy for mitigating age-related cognitive decline and synaptic dysfunction.
    Keywords:
    Alzheimer’s diseaseNMDA receptorsamyloid-β protein precursorglutamatememorymouse hippocampussynaptic plasticityα-secretase

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