Multimodal Analysis of Sepsis-induced Cardiomyopathy in a Baboon Model

Area of Science:

• Cardiology
• Molecular Biology
• Pathology

Background:

• Sepsis-induced cardiomyopathy (SIC) is a major cause of death in sepsis patients.
• Understanding SIC mechanisms is crucial for developing effective treatments.

Purpose of the Study:

• To characterize the molecular and functional changes in sepsis-induced cardiomyopathy using a non-human primate model.
• To identify differences in transcriptomic profiles between survivors and non-survivors of sepsis.

Main Methods:

• Utilized a multimodal approach including single-nucleus RNA sequencing (snRNA-seq), echocardiography, mitochondrial function assays, and histopathology.
• Analyzed archived data and samples from baboons challenged with peptidoglycan.
• Monitored vital signs and cardiac function, with endpoints including survival or euthanasia.

Main Results:

• Septic shock was linked to reduced cardiac output and poor survival.
• snRNA-seq revealed distinct transcriptomic profiles: non-survivors showed inflammation and mitochondrial dysfunction, while survivors activated repair pathways.
• Cardiomyocytes exhibited metabolic dysfunction, endothelial cells showed TNF/NF-κB-driven inflammation, and fibroblasts/pericytes displayed stress responses.

Conclusions:

• This non-human primate model effectively recapitulates key features of sepsis-induced cardiomyopathy.
• Findings highlight distinct cellular and molecular mechanisms differentiating survivors from non-survivors.
• The study provides a foundation for further mechanistic and therapeutic investigations into SIC.