Weekly ReportDec 15–21, 2025
Sepsis, week 51 edition
We read 129 papers and selected 3.
Summary
This week’s sepsis literature advanced three major directions: mechanistic targeting of endothelial and cardiac injury, early risk stratification for disseminated intravascular coagulation (DIC), and rapid host–pathogen diagnostics. Preclinical studies identified DLL4–Notch1-driven endothelial PANoptosis and heme–STING-mediated cardiac endothelial senescence as actionable pathways, while a human biomarker study linked admission IFNβ to subsequent DIC through the MALAT1–caspase-11 axis. Translational progress included multiplex molecular profiling, metagenomic prediction of neonatal sepsis, and bedside neurovascular monitoring, but most therapeutic findings remain preclinical. Clinically, evidence supported cautious multimodal use of procalcitonin and individualized anticoagulation decisions in sepsis-associated DIC.
Selected Articles
1. DLL4+ neutrophils promote Notch1-mediated endothelial PANoptosis to exacerbate acute lung injury in sepsis.
This mechanistic study identified an eCIRP-induced DLL4-positive neutrophil subset that activates Notch1 on pulmonary vascular endothelial cells, triggering ZBP1-mediated endothelial PANoptosis and worsening sepsis-induced acute lung injury. A rationally designed Notch1–DLL4 inhibitor reduced PANoptosis, vascular permeability, lung injury, inflammatory markers, and mortality in sepsis models.
Impact: The study reveals a previously unrecognized neutrophil–endothelial pathway and provides a target-specific inhibitor with survival benefit in vivo, making it one of the week’s strongest paradigm-shifting preclinical findings.
Clinical Implications: Notch1–DLL4 blockade could become an endothelial-protective adjunct for sepsis-associated acute lung injury, but human validation, pharmacokinetic studies, and safety assessment are required before clinical translation.
Key Findings
- eCIRP induced DLL4-positive neutrophils that drove ZBP1-initiated endothelial PANoptosis.
- DLL4 binding to endothelial Notch1 amplified PANoptosis and vascular barrier failure.
- A Notch1-derived inhibitor reduced lung injury and inflammation and improved survival in sepsis models.
2. A Critical Role for MALAT1 in Gram-negative Bacteria-induced Coagulation via Regulation of Caspase-11 signaling.
Admission plasma IFNβ predicted the development of septic DIC within 48 hours, whereas HMGB1 did not. Mechanistic studies showed that IFNβ induces macrophage MALAT1, which suppresses GPX4 activity and promotes LPS internalization, caspase-11 activation, GSDMD-dependent phosphatidylserine exposure, and immunocoagulation.
Impact: This paper bridges a clinically measurable early biomarker with a detailed immunocoagulation mechanism, creating both a potential DIC prediction strategy and a targetable MALAT1–GPX4–caspase-11 pathway.
Clinical Implications: IFNβ could support early DIC risk stratification, while MALAT1, GPX4, or caspase-11 modulation may offer future approaches to limit sepsis-associated coagulopathy. External clinical validation and therapeutic safety studies are still needed.
Key Findings
- Admission IFNβ, but not HMGB1, correlated with DIC onset 48 hours later.
- IFNβ induced macrophage MALAT1, reduced GPX4 activity, and enhanced caspase-11-dependent coagulation.
- Macrophage-specific Malat1 deletion reduced phosphatidylserine exposure and protected against bacteria-induced coagulation.
3. Heme drives cardiac endothelial senescence in sepsis via STING activation.
This study identified cardiac endothelial cells as the predominant senescent population in septic hearts and showed that elevated heme directly activates STING, promoting endothelial senescence and cardiac dysfunction. Pharmacologic STING inhibition and hemopexin-mediated heme clearance reduced senescence and improved cardiac recovery in septic mice.
Impact: The work establishes a novel hemolysis-to-STING-to-endothelial-senescence pathway linking circulating heme to septic cardiomyopathy and identifies two actionable intervention points.
Clinical Implications: Heme-scavenging strategies such as hemopexin or STING inhibition could eventually be evaluated for septic cardiac dysfunction, although human confirmation, dosing, and safety data are not yet available.
Key Findings
- Cardiac endothelial cells were the predominant senescent population in septic cardiac tissue.
- Heme promoted STING polymerization and activation, driving endothelial senescence and cardiac dysfunction.
- STING inhibition or hemopexin-mediated heme clearance improved cardiac recovery in septic mice.