Metabolic Coherence of the Mouse Brain

Area of Science:

• Neuroscience
• Metabolomics
• Systems Biology

Background:

• Brain metabolism is crucial but poorly understood across regions.
• Coordinated metabolic regulation is key to brain function.

Purpose of the Study:

• To map the spatial metabolome across mouse brain divisions.
• To define and assess "metabolic coherence" between brain regions.
• To investigate metabolic changes in an Alzheimer's disease model and the effects of targeted interventions.

Main Methods:

• Matrix-assisted laser desorption/ionization (MALDI) imaging for spatial metabolomics.
• Integration with the Allen Brain Atlas.
• Optimal transport-based computational analysis for metabolic coherence.
• Lentiviral shHIF1α knockdown and AAV-mediated AOX expression in a mouse model.

Main Results:

• A map of the spatial metabolome across twelve mouse brain divisions was generated.
• Metabolic coherence, an inter-regional metabolite similarity metric, was defined and found to be largely preserved in an Alzheimer's model.
• Local interventions in the hippocampus normalized metabolites locally and in distal regions, improving social memory.
• Gene modulation and amyloid plaque reduction were localized to the injection site.

Conclusions:

• Metabolic coherence is a fundamental property of the brain's spatial metabolome.
• This coherence is maintained in Alzheimer's disease, despite altered metabolite levels.
• Targeted interventions can restore metabolic balance across connected brain regions, with functional behavioral benefits.