Mitochondrial Pyruvate Transport and Metabolic Regulation

Pyruvate generated by glycolysis in the cytosol enters mitochondria via the mitochondrial pyruvate carrier (MPC) complex, a critical gateway linking cytosolic metabolism with the tricarboxylic acid (TCA) cycle and oxidative phosphorylation. Through controlled pyruvate uptake, cells regulate ATP production, redox balance and anaplerotic flux into biosynthetic pathways. MPC activity is modulated at multiple levels, including transcriptional control, post-translational modification and interaction with regulatory proteins, allowing dynamic adaptation to nutritional state, oxygen availability and energetic demand. Disruption of pyruvate import shifts cells towards aerobic glycolysis or increased reliance on alternative fuels such as glutamine, with profound consequences for tissue homeostasis. In liver, MPC function governs gluconeogenesis and systemic glucose balance, while in proliferative and stem cell populations it influences the transition between quiescence and activation. In tumour cells, altered MPC expression or pharmacological inhibition reprogrammes substrate usage and can enhance susceptibility to therapy. Understanding the mechanistic basis of mitochondrial pyruvate transport and its integration with broader metabolic networks offers novel opportunities to treat metabolic diseases, cancer and degenerative disorders.

Research from Nature Portfolio

Recent studies have identified MPC as a pivotal control point in tumour metabolism and treatment response. In particular, selective inhibition of MPC activity with small-molecule inhibitors both arrests mitochondrial pyruvate oxidation and prevents lactate uptake by oxidative cancer cells. This dual effect leads to intracellular pyruvate accumulation, uncompensated reduction in mitochondrial respiration and increased reliance on glycolysis, thereby creating cytotoxic stress. Importantly, blocking MPC sensitises hypoxic tumour regions to radiotherapy by alleviating local hypoxia and amplifying DNA damage, highlighting the therapeutic potential of targeting pyruvate import to enhance cancer treatment.

Mitochondrial Pyruvate Transport and Metabolic Regulation publication trend

The graph below shows the total number of articles in mitochondrial pyruvate transport and metabolic regulation across all publications each year (not limited to Nature Index journals).

Technical terms

Mitochondrial pyruvate carrier (MPC): A multimeric protein complex in the inner mitochondrial membrane that facilitates import of pyruvate into the mitochondrial matrix, coupling glycolysis to the TCA cycle.

Glycolysis: The cytosolic pathway converting glucose to pyruvate, yielding ATP and NADH, and providing substrates for mitochondrial oxidation.

Tricarboxylic acid (TCA) cycle: A series of enzymatic reactions in the mitochondrial matrix that oxidise acetyl-CoA to CO₂, generating reducing equivalents for oxidative phosphorylation.

Oxidative phosphorylation: The process by which electrons from NADH and FADH₂ pass through the respiratory chain to drive ATP synthesis via the proton gradient.

Gluconeogenesis: The metabolic pathway in liver and kidney that synthesises glucose from non-carbohydrate precursors, notably pyruvate and lactate, to maintain blood glucose levels.

References

1. Interruption of lactate uptake by inhibiting mitochondrial pyruvate transport unravels direct antitumor and radiosensitizing effects. Nature Communications (2018).
2. Mitochondrial pyruvate metabolism regulates the activation of quiescent adult neural stem cells. Science Advances (2023).
3. The SLC25A47 locus controls gluconeogenesis and energy expenditure. Proceedings of the National Academy of Sciences of the United States of America (2023).
4. MARCH5 promotes aerobic glycolysis to facilitate ovarian cancer progression via ubiquitinating MPC1. Apoptosis (2024).