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ApoE isoform affects LTP in human targeted replacement mice
Barbara L Trommer1, Chirag Shah, Sung Hwan Yun
1Department of Pediatrics, Alzheimer's Disease Core Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60614, USA. btrommer@northwestern.edu
Neuroreport
|December 1, 2004
Summary
Apolipoprotein E (apoE) epsilon4 allele increases Alzheimer's risk, while epsilon2 decreases it. ApoE isoforms differentially affect long-term potentiation (LTP), a key memory process, with epsilon3 showing the greatest LTP.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Apolipoprotein E (apoE) epsilon4 allele is linked to increased Alzheimer disease risk and memory impairment.
- The epsilon2 allele of apoE is associated with decreased risk for these conditions.
- The underlying mechanisms for apoE isoform-dependent effects on memory remain unclear.
Purpose of the Study:
- To investigate the role of different apolipoprotein E (apoE) isoforms in synaptic plasticity and memory.
- To elucidate the mechanisms by which apoE isoforms modulate susceptibility to memory impairment.
Main Methods:
- Utilized hippocampal slices from various mouse models: wild-type (WT), apoE knockout (apoE-KO), and targeted replacement (apoE-TR) mice expressing human apoE2, E3, or E4.
- Assessed basal synaptic transmission and long-term potentiation (LTP) across different apoE genotypes.
Main Results:
- All mouse strains exhibited comparable basal synaptic transmission.
- Long-term potentiation (LTP) was significantly higher in WT and apoE3-TR mice compared to apoE-KO, apoE2-TR, and apoE4-TR mice.
- ApoE isoform expression significantly impacts synaptic plasticity.
Conclusions:
- Apolipoprotein E (apoE) isoforms differentially modulate long-term potentiation (LTP), a cellular model of memory.
- The apoE3 isoform appears to support optimal synaptic plasticity compared to apoE2 and apoE4.
- This study provides a novel system to explore apoE's role in memory and Alzheimer disease pathogenesis.