Sweet sixteen for ANLS.
Level 5 - mechanism / opinion, no new human data
Narrative review of cellular mechanisms and modeling studies without systematic review or direct human clinical trial data.
PubMed 22027938 · doi:10.1038/jcbfm.2011.149
What was done
The authors synthesized experimental and computational modeling literature published over the 16 years following the initial proposal of the astrocyte-neuron lactate shuttle (ANLS) model. The review focuses on cellular and molecular evidence regarding distinct metabolic phenotypes between neurons and astrocytes, astrocytic glycogen breakdown, and monocarboxylate transporter regulation.
What was found
The abstract provides no quantitative data or specific numerical metrics. Qualitatively, it highlights evidence that neurons exhibit primarily oxidative metabolism while astrocytes are mainly glycolytic. Astrocytes operate as a syncytium to distribute lactate derived from astrocytic glycogen stores to active neurons to support glutamatergic neurotransmission, synaptic plasticity, memory, neuroprotection, and cerebral blood flow regulation.
Why it matters
This paper provides an updated conceptual framework for brain energetics, linking metabolic coupling between glia and neurons directly to synaptic plasticity, neurodegeneration mechanisms, and the biological interpretation of functional neuroimaging.
Limits
This is a narrative, non-systematic review that lacks quantitative effect estimates, meta-analytic pooling, or structured study selection criteria. The underlying evidence rests largely on in vitro, animal, and computational models, limiting direct translation to human in vivo physiology.
Cited by
- partial Lactate crosses into tissues including the brain via monocarboxylate transporters (MCT) and is utilized for neurotransmitter synthesis (norepinephrine, serotonin, dopamine) and neuronal energy production.