Monocarboxylate transporters in the central nervous system: distribution, regulation and function.
Level 5 - mechanism / opinion, no new human data
Narrative review of preclinical and mechanistic studies without systematic methodology
PubMed 15953344 · doi:10.1111/j.1471-4159.2005.03168.x
What was done
This narrative review summarizes evidence on the regional and cellular distribution, translational regulation, and functional roles of monocarboxylate transporters (MCTs)—specifically isoforms MCT1, MCT2, and MCT4—in the mammalian and rodent central nervous system.
What was found
The abstract reports no numerical data. Qualitatively, three MCT isoforms demonstrate distinct cellular localization in rodent brain: MCT1 is expressed in microvascular endothelial cells, ependymocytes, and astrocytes; MCT4 is specific to astrocytes; and MCT2 is the predominant neuronal transporter, with immunoreactivity detected at postsynaptic sites. The review also notes that MCT expression changes across development, responds to nutritional modifications, and is regulated translationally by neurotransmitters.
Why it matters
Elucidating cell-specific MCT localization clarifies how alternative fuels like lactate, pyruvate, and ketone bodies support cerebral energetics, synaptic transmission, and metabolic homeostasis in central nervous system disorders such as ischaemia and neurodegenerative diseases.
Limits
This is a non-systematic narrative review based primarily on preclinical rodent and cellular models. The abstract presents no quantitative effect sizes, statistical metrics, search criteria, or human clinical data.
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.