Mitochondrial lactate oxidation complex and an adaptive role for lactate production.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic framework paper without original clinical trial data
PubMed 18379211 · doi:10.1249/MSS.0b013e31815fcb04
What was done
This paper reviews the evidence for the intracellular lactate shuttle hypothesis, outlining the components of the mitochondrial lactate oxidation complex (mMCT1, CD147, mLDH, and cytochrome oxidase) and summarizing lactate's role as a signaling molecule in exercise adaptation.
What was found
No numerical results or statistical values are reported in the abstract. The paper describes qualitative mechanisms showing that isolated mitochondria directly oxidize lactate, and that lactate stimulates the expression of MCT1 and cytochrome oxidase genes and proteins to enhance oxidative clearance capacity.
Why it matters
It provides a mechanistic model reframing lactate from a metabolic waste product into a direct oxidative fuel and signaling molecule that promotes mitochondrial adaptation to exercise.
Limits
The abstract provides no sample size, experimental metrics, or participant details, relying on qualitative mechanistic summaries from isolated mitochondrial and pre-clinical models rather than clinical trial data.
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