APOE 4 polymorphism results in early cognitive deficits in an EAE model

Area of Science:

• Neuroimmunology
• Cognitive Neuroscience
• Genetics

Background:

• Clinical studies suggest a link between APOE 4 genotype and cognitive impairments in multiple sclerosis (MS) patients.
• The precise role of APOE in the interplay between neuroinflammation and cognitive function in MS remains unclear.

Purpose of the Study:

• To investigate the impact of APOE genotype on cognitive function during neuroinflammation.
• To establish a mouse model for studying APOE's role in experimental autoimmune encephalomyelitis (EAE), a model of MS.

Main Methods:

• Induction of experimental autoimmune encephalomyelitis (EAE) in APOE knockout (KO) and human APOE 4 knockin (E4) mice.
• Assessment of spatial learning and recall using behavioral tests.
• Histological analysis to determine regional changes in neurochemical markers, such as choline acetyltransferase.

Main Results:

• Both APOE KO and E4 mice exhibited significant deficits in spatial learning and memory following EAE induction.
• A notable decrease in hippocampal choline acetyltransferase was observed in affected mice, indicating cholinergic system dysfunction.
• The study successfully modeled the interaction of APOE and neuroinflammation in a transgenic animal.

Conclusions:

• APOE genotype significantly modulates cognitive deficits in the context of neuroinflammation.
• The findings highlight APOE's critical role in maintaining cognitive function during inflammatory conditions relevant to multiple sclerosis.
• This transgenic EAE model serves as a valuable tool for future research into APOE's neurological functions.