Extracellular DNA and Deoxyribonuclease Activity as Prognostic Markers in Sepsis.

Background/Objectives: Sepsis is characterized by a dysregulated immune response to infection and is associated with high lethality. Extracellular DNA (ecDNA) has drawn significant interest as a damage-associated molecular pattern because of its potential involvement in the pathophysiology of sepsis. Methods: In this study, we examined the ecDNA concentration in 27 adult patients admitted to the intensive care unit. Fluorometry and quantitative PCR were used for the assessment of ecDNA. In addition, deoxyribonuclease activity was measured as a potential modulator of ecDNA. Results: Our findings reveal nearly 5-fold higher concentrations of ecDNA in non-survivors, suggesting its potential as a prognostic indicator for sepsis outcomes on day 7. Interestingly, the subcellular origin of ecDNA was similar between patients diagnosed with systemic inflammatory response syndrome, sepsis, and septic shock. Deoxyribonuclease activity, implicated in the cleavage of ecDNA, was comparable across all patient groups. Conclusions: To establish the prognostic value of ecDNA as a biomarker, further investigations within a larger patient cohort are needed. Nevertheless, our results suggest that high ecDNA in sepsis patients represents a negative prognostic biomarker.