Mitochondrial Fitness as a Functional Immune Checkpoint in Cancer: Metabolic Plasticity, Tumor Evolution, and Immunotherapy
TL;DR
Integrating functional mitochondrial profiling into precision oncology can optimize biomarker development, clarify resistance mechanisms, and improve the durability of immunotherapy responses.
Abstract
Simple Summary This review proposes the mitochondrial functional immune checkpoint as a conceptual framework linking mitochondrial fitness to cancer–immune interactions. Rather than acting through conventional ligand-receptor signaling, mitochondrial fitness represents an organelle-level regulatory layer influencing both tumor-cell adaptation and immune-cell competence. In cancer cells, metabolic plasticity and mitochondrial activity sustain oxidative phosphorylation, stress tolerance, stem-like properties, and resistance to treatments such as immune checkpoint inhibitors, CAR-T cell therapies, and bispecific antibodies. Conversely, in immune effectors, mitochondrial dysfunction contributes to T-cell exhaustion and reduced functional persistence within the hostile tumor microenvironment. Consequently, effective therapeutic strategies require a dual approach: selectively exploiting tumor-specific mitochondrial vulnerabilities while preserving or enhancing the bioenergetic competence of immune cells. Integrating functional mitochondrial profiling into precision oncology can optimize biomarker development, clarify resistance mechanisms, and improve the durability of immunotherapy responses.