β-Hydroxybutyrate in the Brain: One Molecule, Multiple Mechanisms.
Level 5 - mechanism / opinion, no new human data
Narrative review of biochemical and physiological mechanisms with no new empirical data
PubMed 27826689 · doi:10.1007/s11064-016-2099-2
What was done
This narrative review synthesized mechanistic literature on the role of the ketone body β-hydroxybutyrate (βOHB) in the brain, focusing on its cellular metabolism, energetic efficiency, direct signaling pathways, epigenetic actions, and potential therapeutic delivery strategies such as ketogenic diets and ketone esters.
What was found
The abstract provides no quantitative data. Qualitatively, it reports that βOHB is synthesized in astrocytes, crosses the blood-brain barrier, and is metabolized in mitochondria across all brain cell types. Mechanistically, βOHB alters the NAD+/NADH and Q/QH2 redox couples, decreases mitochondrial reactive oxygen species generation, directly modulates K+ and Ca2+ channel activity, acts as an endogenous histone deacetylase inhibitor to upregulate antioxidant and metabolic genes, and inhibits inflammasome activation to suppress inflammatory cytokine release.
Why it matters
The paper outlines how βOHB functions beyond a simple alternative energy substrate to act as an epigenetic and anti-inflammatory signaling molecule, supporting the biochemical rationale for developing exogenous ketone therapies.
Limits
As a narrative review, the abstract contains no original experimental data, systematic review methodology, or clinical efficacy metrics. Generalizability to human clinical outcomes cannot be established from the mechanistic descriptions provided.
Cited by
- supports Ketone bodies generate less oxidative stress and require less energy to produce cellular energy compared to glucose.