Lactate Mediates the Effects of Exercise on Learning and Memory through SIRT1-Dependent Activation of Hippocampal Brain-Derived Neurotrophic Factor (BDNF).
Level 5 - mechanism / opinion, no new human data
Preclinical animal laboratory study (Mus musculus)
PubMed 30692222 · doi:10.1523/JNEUROSCI.1661-18.2019
What was done
The authors examined the molecular mechanism connecting physical exercise to cognitive enhancement in male mice (Mus musculus). They tested whether lactate produced by exercising muscles crosses the blood-brain barrier to modulate hippocampal Bdnf expression, TRKB signaling, spatial learning, and memory retention, focusing on the downstream involvement of SIRT1, PGC1a, and FNDC5.
What was found
The abstract reports no numerical values, sample sizes, or effect sizes. Directionally, exercise-derived lactate crossed the blood-brain barrier and induced hippocampal Bdnf expression and TRKB signaling. This was associated with improved spatial learning and memory retention in a manner dependent on SIRT1 activation, which increased PGC1a and FNDC5 levels.
Why it matters
The study identifies blood-borne lactate as a direct signal connecting muscle activity to hippocampal neuroplasticity and memory. Elucidating the SIRT1-PGC1a-FNDC5-BDNF pathway highlights lactate as a candidate target for developing exercise-mimetic interventions for neurological conditions.
Limits
The study was conducted entirely in male mice, limiting direct generalizability to females and humans. The abstract does not provide quantitative data, exact sample sizes, statistical variance, or specific exercise protocols.
Cited by
- supports Lactate produced during high-intensity exercise readily crosses into the brain and stimulates brain-derived neurotrophic factor (BDNF) production.