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Related Concept Videos

Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...
Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.

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Related Experiment Video

Updated: Jun 20, 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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ApoE isoform-dependent changes in hippocampal synaptic function.

Kimberly M Korwek1, Justin H Trotter, Mary Jo Ladu

  • 1Department of Molecular Pharmacology and Physiology, Johnnie B Byrd Sr Alzheimer's Center & Research Institute, University of South Florida Tampa, Florida 33612, USA. eweeber@health.usf.edu.

Molecular Neurodegeneration
|September 4, 2009
PubMed
Summary
This summary is machine-generated.

Apolipoprotein E (apoE) isoforms differentially affect hippocampus synaptic plasticity, with apoE4 enhancing long-term potentiation (LTP) more than apoE2. These apoE isoform effects involve NMDA-receptor function and distinct signaling pathways.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Molecular Biology

Background:

  • The hippocampus lipoprotein receptor system modulates synaptic transmission and plasticity.
  • Apolipoprotein E (apoE) isoforms are linked to neurodegenerative diseases, prompting investigation into their synaptic roles.
  • Understanding apoE isoform function is crucial for neurodegenerative disorder research.

Purpose of the Study:

  • To investigate the role of specific apolipoprotein E (apoE) isoforms in hippocampus synaptic function.
  • To compare the effects of apoE2, apoE3, and apoE4 isoforms on synaptic transmission and long-term potentiation (LTP) in the hippocampus.
  • To elucidate the molecular mechanisms underlying apoE isoform-dependent synaptic modulation.

Main Methods:

  • Utilized targeted replacement (TR) mice expressing human apoE2, apoE3, and apoE4 isoforms.
  • Administered recombinant human apoE isoforms to assess acute effects.
  • Measured synaptic transmission and LTP in hippocampus area CA1.
  • Analyzed NMDA-receptor function and ERK/JNK signaling pathway activation.

Main Results:

  • Synaptic transmission was not affected by apoE isoform.
  • Long-term potentiation (LTP) was significantly enhanced in apoE4 TR mice compared to apoE2 TR mice.
  • ApoE isoform differences in LTP induction depend on NMDA-receptor function and alter ERK/JNK signaling.
  • Acute apoE isoform application altered LTP and decreased NMDA-receptor potentials, with different effects on signaling pathways compared to chronic expression.

Conclusions:

  • Human apoE isoforms exert specific, isoform-dependent effects on adult hippocampus synaptic plasticity.
  • Mechanisms differ between chronic apoE isoform expression and acute apoE isoform exposure.
  • Findings highlight the critical role of apoE isoforms in synaptic function and potential therapeutic targets for neurodegenerative diseases.