Modulating CD8⁺ T cell immunity through exercise: mechanistic insights and implications for precision immunotherapy.

Area of Science:

• Immunology
• Exercise Physiology
• Cell Biology

Background:

• CD8⁺ T lymphocytes are key cellular components of adaptive immunity, responsible for cytotoxic functions vital for controlling infections and cancer.
• The tissue microenvironment, including metabolic and structural factors, significantly influences CD8⁺ T cell activity.
• Physical exercise is recognized as a powerful non-pharmacological intervention affecting immune cell function.

Purpose of the Study:

• To review the multifaceted effects of physical exercise on CD8⁺ T cell biology.
• To elucidate the mechanisms underlying exercise-induced adaptations in CD8⁺ T cells.
• To explore the potential of exercise as a therapeutic strategy to enhance cytotoxic immunity in various disease contexts.

Main Methods:

• Integration of mechanistic and translational evidence from physiological and pathological studies.
• Analysis of how acute exercise and sustained training impact CD8⁺ T cell subsets, function, and persistence.
• Examination of the neuroendocrine, vascular, and metabolic pathways mediating these effects.

Main Results:

• Acute exercise mobilizes effector and memory CD8⁺ T cells and alters their activation thresholds.
• Sustained exercise training improves CD8⁺ T cell mitochondrial function and reduces immunosenescence.
• Exercise-induced adaptations are context-dependent, influenced by host factors and disease states.

Conclusions:

• Physical exercise profoundly modulates CD8⁺ T cell immunity through complex physiological pathways.
• Understanding these adaptations is crucial for leveraging exercise to bolster immune responses in health and disease.
• Personalized, biomarker-guided exercise interventions hold promise for precision immunotherapy.