Memory function in a mouse genetic model of Alzheimer's disease

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• The apolipoprotein E (ApoE) E4 allele is a significant risk factor for late-onset Alzheimer's disease (AD).
• ApoE knockout (ApoE KO) mice exhibit AD pathologies like neurofibrillary tangles and senile plaques, but cognitive deficits remain inconclusive.
• Existing memory models, such as the Morris water maze, may not fully capture cognitive impairments in ApoE KO mice.

Purpose of the Study:

• To investigate spatial memory in ApoE KO mice using an 8-arm radial maze task.
• To evaluate the efficacy of a combination antioxidant therapy (CAT) in mitigating cognitive deficits in ApoE KO mice.
• To clarify the relationship between ApoE genotype, AD pathology, and cognitive function.

Main Methods:

• Spatial memory assessment in ApoE KO mice and control groups using an 8-arm radial maze.
• Longitudinal comparison of memory performance between strains.
• Administration and evaluation of combination antioxidant therapy (CAT) on memory function.

Main Results:

• ApoE KO mice demonstrated superior reference memory and fewer incorrect entries compared to control mice.
• No significant strain differences were found in working memory errors.
• Combination antioxidant therapy (CAT) did not significantly impact memory performance in either group.

Conclusions:

• ApoE genotype influences spatial memory performance, with ApoE KO mice exhibiting enhanced reference memory.
• The 8-arm radial maze task provides a sensitive measure for spatial memory in AD mouse models.
• Combination antioxidant therapy was ineffective in improving cognitive function in this model of AD.