The mitochondrial pyruvate carrier regulates memory T cell differentiation and antitumor function

Area of Science:

• Immunology
• Cell Metabolism
• Cancer Biology

Background:

• Glycolysis regulates CD8+ T cell differentiation.
• The role of mitochondrial pyruvate metabolism and the mitochondrial pyruvate carrier (MPC) in T cell function is unclear.

Purpose of the Study:

• Investigate the impact of mitochondrial pyruvate uptake via MPC on CD8+ T cell function and fate.
• Determine the role of MPC in T cell differentiation and antitumor immunity.
• Evaluate the therapeutic potential of MPC inhibition in CAR T cell therapy.

Main Methods:

• Genetic deletion of MPC in CD8+ T cells.
• Metabolic analysis including glutamine and fatty acid oxidation.
• Assessment of histone acetylation and chromatin accessibility.
• In vivo studies using tumor models and CAR T cells.

Main Results:

• MPC deletion promotes CD8+ T cell differentiation into memory cells.
• MPC inhibition induces metabolic flexibility, enhancing pro-memory gene accessibility.
• MPC is crucial for CD8+ T cell antitumor function in the tumor microenvironment.
• MPC inhibition during CAR T cell manufacturing imprints a memory phenotype, enhancing antitumor activity.

Conclusions:

• Mitochondrial pyruvate uptake via MPC critically influences T cell metabolic flexibility and differentiation.
• Targeting MPC offers a strategy to enhance T cell memory and antitumor immunity.
• MPC inhibition is a promising approach for improving CAR T cell therapy outcomes.