Ketones Elicit Distinct Alterations in Adipose Mitochondrial Bioenergetics.
Level 5 - mechanism / opinion, no new human data
Preclinical laboratory research combining in vitro cell culture, animal models, and ex vivo human adipose tissue.
PubMed 32872407 · doi:10.3390/ijms21176255
What was done
Researchers investigated the direct effect of the ketone body β-hydroxybutyrate (βHB) on adipose tissue mitochondrial bioenergetics across three experimental systems: cultured adipocytes, rodent subcutaneous adipose tissue (SAT), and human SAT. Following βHB exposure, they quantified mitochondrial respiration, ATP production, and the expression of genes involved in mitochondrial biogenesis and uncoupling.
What was found
Exposure to βHB increased mitochondrial respiration by roughly 91% in cultured adipocytes, 113% in rodent SAT, and 128% in human SAT. This occurred without a commensurate increase in adipose ATP production. In cultured adipocytes and rodent adipose, βHB exposure also increased gene expression related to mitochondrial biogenesis and uncoupling status.
Why it matters
These results identify a potential mechanistic basis—adipose mitochondrial uncoupling—for the increased metabolic rate observed during states of elevated ketone levels.
Limits
The abstract does not state sample sizes, exposure doses or durations, or measures of variance (e.g., confidence intervals, standard deviations, or p-values). Human findings are based on ex vivo tissue samples rather than in vivo clinical interventions.
Cited by
- partial Lowering insulin levels increases adipose tissue metabolic rate and mitochondrial uncoupling in humans.