Systemic mapping of senescence characteristics across septic tissues

Area of Science:

• Immunology
• Systems Biology
• Genomics

Background:

• Sepsis causes severe systemic disturbances, but the underlying cellular mechanisms are not fully understood.
• Investigating the cellular basis of sepsis is crucial for developing effective treatments.

Purpose of the Study:

• To uncover the conserved cellular and molecular programs driving sepsis system-wide.
• To identify key regulatory mechanisms and potential therapeutic targets in sepsis.

Main Methods:

• Integration of single-cell transcriptomes from six septic tissues.
• Analysis of conserved cross-tissue transcriptional programs.
• Identification of key transcription factors and intercellular communication circuits.

Main Results:

• A conserved program of inflammation-driven senescence and disrupted intercellular communication was identified across tissues.
• Specific transcription factors (e.g., Atf4, Cebpb, Cebpd) were linked to senescence-like states.
• Endothelial and neutrophil populations were identified as key amplifiers, with neutrophil signatures improving sepsis risk stratification.

Conclusions:

• Sepsis accelerates immunological aging through conserved regulatory mechanisms.
• Targeting identified pathways may mitigate acute sepsis injury and long-term complications.
• Neutrophil-derived molecular signatures enhance prognostic accuracy for sepsis patients.