Hippocampal Bioenergetics and Metabolic Profiling Identifies Fatty Acid Oxidation as a Potential Therapeutic Target...

Area of Science:

• Neuroscience
• Metabolic research
• Traumatic Brain Injury

Background:

• Traumatic brain injury (TBI) leads to cognitive deficits, particularly memory impairment, linked to hippocampal damage.
• Hippocampal vulnerability in TBI may stem from bioenergetic dysfunction, a poorly understood area.
• Identifying post-TBI metabolic changes is crucial for discovering new therapeutic targets.

Purpose of the Study:

• To investigate bioenergetic disturbances and metabolic alterations in the hippocampus following TBI.
• To explore the role of fatty acid oxidation (FAO) in TBI pathophysiology and recovery.
• To assess the neuroprotective potential of enhancing FAO post-TBI.

Main Methods:

• Utilized a controlled cortical impact mouse model for TBI.
• Performed Seahorse analysis for mitochondrial function, metabolomics, and proteomics on hippocampal slices.
• Employed isotope tracing to track metabolic pathways and administered sodium octanoate to evaluate therapeutic effects.

Main Results:

• TBI acutely reduced mitochondrial oxidative phosphorylation and altered purine, glucose, amino acid, and fatty acid metabolism.
• Fatty acid oxidation (FAO) was enhanced in the subacute phase, suggesting a compensatory mechanism.
• Sodium octanoate administration post-TBI improved mitochondrial respiration, reduced neuroinflammation, and attenuated neurodegeneration.

Conclusions:

• TBI induces significant, yet often transient, metabolic dysregulation in the hippocampus.
• Enhanced FAO represents a potential compensatory pathway and a therapeutic target for TBI.
• Targeting FAO with agents like sodium octanoate may offer a novel neuroprotective strategy following TBI.