Enriched Environment Promoted Cognitive Function via Bilateral Synaptic Remodeling After Cerebral Ischemia.

Area of Science:

• Neuroscience
• Stroke Research
• Cognitive Function

Background:

• Ischemic stroke is a leading cause of death and disability worldwide.
• Cognitive dysfunction following stroke significantly impacts quality of life.
• Synaptic plasticity is crucial for cognitive function, but its modulation post-stroke is not fully understood.

Purpose of the Study:

• To investigate the effect of an enriched environment (EE) on synaptic plasticity and cognitive recovery in a mouse model of ischemic stroke.
• To determine if EE influences synaptic plasticity in both ipsilateral and contralateral brain hemispheres after stroke.

Main Methods:

• Permanent middle cerebral artery occlusion mouse model.
• Morris water maze test for cognitive function assessment.
• Electron microscopy for synapse quantification.
• Immunofluorescence and Western blot for SYN and GAP-43 expression analysis.

Main Results:

• EE significantly promoted cognitive function recovery in stroke mice compared to standard housing.
• EE increased synapse numbers and expression of SYN and GAP-43 in both ipsilateral and contralateral hemispheres.
• A positive correlation was found between cognitive outcomes and GAP-43/SYN expression, with a stronger correlation in the contralateral hemisphere.

Conclusions:

• Enriched environment may enhance cognitive function through bilateral synaptic remodeling after cerebral ischemia.
• The contralateral brain hemisphere plays a significant role in cognitive recovery following stroke.