Ketone Body β-Hydroxybutyrate Boosts Mitochondrial Health Through Novel Mechanism

This groundbreaking research reveals a new way that ketone bodies support cellular health, with significant implications for longevity and metabolic medicine. The study focuses on β-hydroxybutyrate (BHB), the primary ketone body produced during fasting, exercise, or ketogenic diets.

The researchers investigated how BHB affects mitochondrial-derived vesicles (MDVs), which are cellular structures that transport damaged mitochondrial components to lysosomes for degradation or to the extracellular space for disposal. This process is crucial for maintaining healthy mitochondria, the powerhouses of cells.

The key discovery is that BHB directly modifies a protein called sorting nexin-9 (SNX9) through a process called β-hydroxybutyrylation. This chemical modification enhances SNX9's ability to interact with inner mitochondrial membrane proteins and promotes the formation of MDVs that specifically target damaged inner mitochondrial components.

In animal studies, this mechanism protected mice from alcohol-induced liver injury, demonstrating real-world therapeutic potential. The findings establish a direct link between metabolites and mitochondrial quality control, showing how dietary interventions that increase ketone production might support cellular health through enhanced mitochondrial maintenance.

This research provides molecular evidence for the health benefits of ketogenic diets and intermittent fasting, suggesting these interventions work partly by improving the cell's ability to maintain healthy mitochondria through enhanced cleanup mechanisms.