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Oct 28, 2026

University of Utah researchers discover heart backup energy system using lactate

Researchers at the University of Utah have identified a backup energy system in the heart that uses the protein MCT1 to import lactate into mitochondria, where it is converted to pyruvate to sustain cardiac function when normal glucose pathways fail. The discovery, demonstrated in mouse hearts, shows this mechanism can prevent stress-induced heart failure.

Oct 28, 2026·2 sources
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Top claims

  • ▪Mitochondrial oxidation of carbon fuels accounts for more than 95% of total human ATP energy production.
  • ▪Unlike most human tissues where elevated glucose consumption restricts lactate utilization due to cytosolic NAD+ competition, heart muscle oxidizes both substrates simultaneously.
  • ▪In experiments on MPC1-knockout mice, University of Utah researchers observed sustained carbohydrate oxidation in heart muscle despite mitochondrial pyruvate carrier deficiency.

Subtopics

Biomedical research1Cardiovascular diseases1Heart health1Mitochondrial function1Molecular biology1Scientific research1

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