Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 104, Issue 1, Pages 353-358Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0608807104
Keywords
Alzheimer's disease; synaptic transmission; glutamate receptor; synaptic vesicle cycling
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Funding
- NIDA NIH HHS [T32 DA07278-10, T32 DA007278] Funding Source: Medline
- NINDS NIH HHS [F31 NS051906, 1F31NS051906-01] Funding Source: Medline
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Overexpression of the amyloid precursor protein (APP) in hippocampal neurons leads to elevated P-amyloid peptide (AP) production and consequent depression of excitatory transmission. The precise mechanisms underlying APP-induced synaptic depression are poorly understood. Uncovering these mechanisms could provide insight into how neuronal function is compromised before cell death during the early stages of Alzheimer's disease. Here we verify that APP up-regulation leads to depression of transmission in cultured hippocampal autapses; and we perform whole-cell recording, FM imaging, and immunocytochemistry to identify the specific mechanisms accounting for this depression. We find that APP overexpression leads to postsynaptic silencing through a selective reduction of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor-mediated currents. This effect is likely mediated by A beta because expression of mutant APP incapable of producing A beta did not depress transmission. In addition, although we eliminate presynaptic silencing as a mechanism underlying APP-mediated inhibition of transmission, we did observe an A beta-induced presynaptic deficit in vesicle recycling with sustained stimulation. These findings demonstrate that APP elevation disrupts both presynaptic and postsynaptic compartments.
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