Cellular and subcellular distribution of monocarboxylate transporters in cultured brain cells and in the adult brain.
Level 5 - mechanism / opinion, no new human data
Bench and animal research (in vitro cell culture and rodent brain tissue).
PubMed 15573400 · doi:10.1002/jnr.20307
What was done
The authors investigated the cellular and subcellular distribution of monocarboxylate transporters (MCT1, MCT2, and MCT4) at mRNA and protein levels across cultured brain cells and adult rodent brain tissue (rat and mouse). They also assessed MCT2 expression changes during in vitro neuronal development and after noradrenaline exposure.
What was found
The abstract reports no numerical values, effect sizes, or statistical metrics. Qualitatively, MCT1 was strongly expressed in cortical astrocytes (in vitro and in vivo), blood vessels, ependymocytes, and glia limitans, with weak expression in a subset of cultured neurons. MCT2 was the predominant neuronal MCT across culture and brain parenchyma, localized partly in postsynaptic densities, and present in rat but not mouse white matter astrocytes. MCT4 was found exclusively in astrocytes (cortex, hippocampus, cerebellum). MCT2 expression increased with in vitro synapse formation and increased upon noradrenaline exposure via translational regulation.
Why it matters
This work maps the cellular compartmentalization of monocarboxylate transporters in the central nervous system, supporting cell-specific roles for lactate and ketone transport in brain energy metabolism.
Limits
The abstract contains no sample sizes, numerical data, or statistical values. Findings are based entirely on rodent tissue and in vitro models, limiting direct translation to human brain physiology.
Cited by
- supports Lactate transporters are highly expressed throughout capillary endothelial cells, astrocytes, and neurons in the brain.