Neurons in Need: Glucose, but Not Lactate, Is Required to Support Energy-Demanding Synaptic Transmission.
Level 5 - mechanism / opinion, no new human data
Editorial commentary discussing in vitro neurochemistry findings without human clinical data.
PubMed 41065327 · doi:10.1111/jnc.70255
What was done
This editorial summarizes an experimental laboratory study by Söder et al. that evaluated the metabolic requirements of neuronal network signaling. The highlighted study tested the capacity of glucose versus lactate to fuel synchronized synaptic transmission, assessed the impact of blocking lactate transport in the presence of glucose, and tracked neuronal lactate production and release under resting and stimulated conditions using a lactate biosensor.
What was found
The abstract reports no numerical values or effect sizes. It reports that neurons sustained energy-demanding synchronized synaptic transmission only when glucose was freely available. Blocking lactate transport had no effect on signaling in the presence of glucose, whereas supplying lactate as the primary fuel failed to sustain synchronized signaling. Additionally, neurons were shown to produce and release lactate during both rest and stimulation.
Why it matters
These observations challenge the model that neuronal activation depends on astrocyte-derived lactate shuttling, underscoring direct glucose metabolism as essential for high-demand synaptic signaling.
Limits
This is an editorial commentary summarizing preclinical bench research, not an original human study or primary report. The abstract contains no quantitative metrics, sample sizes, or methodological specifications.
Cited by
- context Under normal physiology, astrocytes metabolize glucose and shuttle lactate to neurons, which convert lactate into pyruvate as an energy source.