Objective:

To explore the role of mitochondrial DNA (mtDNA) in the systemic inflammatory network associated with heart failure with preserved ejection fraction (HFpEF).

Approach:

Key Findings:

• mtDNA can be released into circulation and exists in various forms, including free DNA and extracellular vesicle-related DNA.
• mtDNA activates nucleic acid sensing pathways such as TLR9 and cGAS-STING, leading to NLRP3 inflammasome activation.
• The release of mtDNA may amplify systemic inflammation and contribute to the progression of HFpEF.

Interpretation:

The study suggests that mtDNA efflux may serve as an inflammation amplifier in HFpEF, influenced by the phenotype and disease stage.

Limitations:

• Current evidence does not establish mtDNA efflux as the main causal driver of HFpEF.
• The temporal sequence and causal relationships require further verification through longitudinal and intervention studies.

Conclusion:

mtDNA plays a significant role in the inflammatory processes associated with HFpEF, but its exact causal role remains to be determined.

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