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Lactate-carried Mitochondrial Energy Overflow.

Daniela Rauseo1,2,3, Yasna Contreras-Baeza1,2,3, Hugo Faurand1,2

  • 1Centro de Estudios Científicos-CECs, Valdivia, Chile.

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|July 29, 2024
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Summary
This summary is machine-generated.

Mitochondria dynamically metabolize lactate, influencing protein lactylation and reflecting blood lactate levels in neurons. This process, mediated by the mitochondrial pyruvate carrier (MPC), reveals mitochondria as tonic lactate producers.

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Metabolic Research

Background:

  • Mitochondrial lactate metabolism is not fully understood.
  • The role of lactate within mitochondria requires further investigation.

Purpose of the Study:

  • To investigate mitochondrial lactate metabolism and its functional consequences.
  • To elucidate the mechanisms of lactate transport into mitochondria.
  • To determine the physiological conditions affecting mitochondrial lactate production.

Main Methods:

  • Utilized genetically-encoded sensors for dynamic lactate measurement.
  • Assessed protein lactylation in response to lactate.
  • Measured electron transport chain activity and lactate flux.
  • Investigated lactate transport via the mitochondrial pyruvate carrier (MPC).

Main Results:

  • Mitochondria possess a dynamic lactate pool, leading to protein lactylation.
  • Mitochondrial lactate accurately reports blood lactate levels in neurons.
  • Lactate transport across the inner mitochondrial membrane involves the MPC.
  • Mitochondria are tonic lactate producers, influenced by energization and hypoxia.

Conclusions:

  • Mitochondrial lactate metabolism is a key regulatory process.
  • An overflow mechanism regulates mitochondrial redox balance and energy status via lactate.
  • The mitochondrial pyruvate carrier (MPC) is crucial for mitochondrial lactate uptake.