Mitochondrial DNA in Exercise-Mediated Innate Immune Responses.

Area of Science:

• Mitochondrial biology
• Immunology
• Exercise physiology

Background:

• Mitochondria, traditionally viewed as cellular powerhouses, play a significant role in innate immune responses.
• Mitochondrial DNA (mtDNA) possesses immunostimulatory potential, triggering innate immunity upon release from damaged mitochondria.
• Mechanisms of mtDNA release include BAK/BAX pore, mPTP, and GSDMD pore, leading to recognition by PRRs like TLR9, cGAS, and NLRP3.

Purpose of the Study:

• To review the mechanisms of mtDNA release and its role in innate immunity.
• To summarize the influence of different exercise types on mtDNA leakage and subsequent immune responses.
• To identify potential diagnostic and therapeutic strategies for immunopathies related to mtDNA.

Main Methods:

• Literature review of studies on mitochondrial damage, mtDNA release, and innate immune activation.
• Analysis of research investigating the effects of various exercise modalities (chronic moderate-intensity, resistance, HIIT, acute moderate, acute high-intensity) on mitochondrial function and mtDNA release.
• Synthesis of current knowledge regarding exercise-mtDNA-innate immunity interactions.

Main Results:

• Mitochondrial damage leads to mtDNA release, activating innate immune pathways via PRRs.
• Regular exercise, including moderate-intensity endurance and resistance training, enhances mitochondrial function and reduces abnormal mtDNA release.
• High-intensity acute exercise may paradoxically increase mtDNA leakage and exacerbate innate immune responses.

Conclusions:

• Exercise significantly influences mtDNA-driven innate immune responses, with varying effects based on intensity and duration.
• Understanding exercise's impact on mtDNA leakage offers insights into managing inflammatory conditions.
• Further research is warranted to explore exercise-based interventions for immunopathies.