Labeling and isolating cell specific neuronal mitochondria and their functional analysis in mice post stroke

Area of Science:

• Neuroscience
• Mitochondrial Biology
• Stroke Research

Background:

• Neuronal plasticity, crucial for stroke recovery, relies on mitochondrial health.
• Understanding mitochondrial function post-stroke is vital for developing effective treatments.
• Current methods for isolating neuronal mitochondria from specific brain regions after stroke are limited.

Purpose of the Study:

• To investigate neuronal mitochondrial function in vivo during the stroke recovery phase.
• To selectively isolate and analyze mitochondria from specific neuronal populations in stroke-affected brain regions.
• To assess changes in mitochondrial oxidative phosphorylation and function after stroke.

Main Methods:

• Utilized Mito-tag mice and adeno-associated virus serotype 9 (AAV9) for targeted neuronal labeling.
• Induced permanent middle cerebral artery occlusion (MCAO) in mice, followed by tissue collection 14 days post-stroke.
• Selectively isolated neuronal mitochondria from ischemic core, boundary zone, and contralateral hemisphere using anti-HA magnetic beads.

Main Results:

• Successfully isolated pure neuronal mitochondria, confirmed by marker enrichment and exclusion.
• Observed significant decreases in oxidative phosphorylation components in stroke-affected neuronal mitochondria.
• Demonstrated reduced mitochondrial function, measured by oxygen consumption rate, in both ischemic core and boundary zones.

Conclusions:

• Neuronal mitochondrial dysfunction persists during the stroke recovery stage.
• The developed method enables efficient isolation of neuronal mitochondria for functional analysis post-stroke.
• Findings suggest neuronal mitochondria are a potential therapeutic target for stroke recovery.