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Severe learning deficits in apolipoprotein E-knockout mice in a water maze task
M S Oitzl1, M Mulder, P J Lucassen
1Leiden/Amsterdam Center for Drug Research, University of Leiden, The Netherlands. m.oitzl@lacdr.leidenuniv.nl
Brain Research
|March 28, 1997
Summary
Apolipoprotein E (apoE) deficiency critically impairs spatial learning and memory in mice. ApoE-knockout mice showed significant deficits in the Morris water maze task, unlike controls.
Area of Science:
- Neuroscience
- Genetics
Background:
- Apolipoprotein E (apoE) plays a crucial role in neuronal viability, particularly in the hippocampus.
- Understanding apoE's function is vital for neurological research.
Purpose of the Study:
- To investigate the impact of apoE deficiency on spatial learning and memory.
- To assess the behavioral strategies employed by apoE-knockout mice.
Main Methods:
- Utilized the Morris water maze to test spatial learning and memory in 6-month-old mice.
- Compared homozygous apoE-deficient mice with heterozygous control mice.
- Confirmed apoE status through genotyping and immunocytochemistry.
Main Results:
- ApoE-knockout mice exhibited a complete inability to learn the water maze task.
- These mice displayed repetitive 'wall bumping' behavior instead of strategic navigation.
- Control mice successfully learned the task without difficulty.
- Locomotor activity and swimming ability were comparable between groups.
Conclusions:
- Absence of apolipoprotein E is critical for spatial learning and memory abilities.
- ApoE deficiency significantly disrupts cognitive functions related to navigation.
- Further research into apoE's role in the brain is warranted.