Renal Ketogenesis Protects Against Ischemic Kidney Injury.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and bench research
PubMed 41568909 · doi:10.1681/ASN.0000001014
What was done
Researchers investigated the functional role of renal ketogenesis during ischemia/reperfusion injury (IRI) using mice with kidney-specific or liver-specific deletion of Hmgcs2. Outcomes assessed included kidney histology, metabolomics, and lipidomics. To evaluate the effect of exogenous ketones, mice were fed a ketogenic diet for 4 days before IRI. Additionally, using mice with hemagglutinin-tagged proximal tubular mitochondria, proximal tubular-specific mitochondria were isolated to measure fatty acid oxidation capacity at baseline and following IRI.
What was found
The abstract provides directional findings without quantitative values, sample sizes, or exact p-values. Kidney-specific Hmgcs2 deletion resulted in significantly greater kidney injury after IRI compared with wild-type controls, accompanied by decreased renal ketone content and increased lipid droplet accumulation. Mitochondria lacking HMGCS2 exhibited significantly lower fatty acid oxidation capacity both at baseline and post-IRI. A 4-day ketogenic diet prior to IRI decreased kidney injury and augmented mitochondrial fatty acid oxidation in kidney-specific knockout mice. Lipidomic analysis linked the loss of kidney HMGCS2 to decreased arachidonic acid-containing phospholipids and prostaglandin levels.
Why it matters
These findings identify local renal proximal tubular ketogenesis as an essential metabolic defense mechanism that supports mitochondrial fatty acid oxidation during ischemic stress, suggesting potential therapeutic relevance for metabolic support in acute kidney injury.
Limits
The study is restricted to preclinical mouse models, and findings cannot be directly extrapolated to human acute kidney injury. The abstract does not report sample sizes, numerical effect sizes, or confidence intervals. Potential systemic metabolic effects or long-term impacts of the ketogenic diet intervention were not detailed.
Cited by
- supports Ketones are produced by mitochondria in the liver, with a minor amount produced by the kidneys, and the biochemical pathway from ketones to mitochondrial metabolism involves fewer enzymes than that of glucose.