Endothelial cell, but not neutrophil, programmed cell death receptor-ligand 1 loss has a morbid impact on experimental murine shock/sepsis-induced lung injury - Report - MDSpire
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Endothelial cell, but not neutrophil, programmed cell death receptor-ligand 1 loss has a morbid impact on experimental murine shock/sepsis-induced lung injury
Loss of PD-L1 in Endothelial Cells Affects Lung Injury in Sepsis Models
Overview
This study demonstrates that the absence of PD-L1 in endothelial cells significantly reduces lung injury and mortality in murine models of shock and sepsis, while neutrophil PD-L1 deficiency appears to exacerbate lung damage. These findings highlight the differential roles of PD-L1 in various cell types during sepsis-induced lung injury.
Background
Sepsis remains a leading cause of mortality in intensive care units, often resulting in acute lung injury and acute respiratory distress syndrome (ARDS). Understanding the molecular mechanisms that contribute to lung injury in sepsis is crucial for developing targeted therapies. The programmed cell death receptor-ligand 1 (PD-L1) pathway has emerged as a potential modulator of immune responses in sepsis, warranting further investigation into its role in different cell types.
Data Highlights
Group
14-Day Mortality
Lung Vascular Permeability
Cytokine Levels
ecPD-L1−/−
Lower
Decreased
MCP-1 Declined
pmnPD-L1−/−
Increased
No Change
Angiopoietin 2 Increased
Key Findings
ecPD-L1−/− mice showed lower 14-day mortality compared to controls in Hem/CLP models.
Increased lung vascular permeability was observed in control mice, but not in ecPD-L1−/− mice.
Cytokine levels, including MCP-1, significantly declined in ecPD-L1−/− mice compared to controls.
In contrast, pmnPD-L1−/− mice exhibited increased levels of Angiopoietin 2 and inflammatory cytokines like MIP-2 and IL-6.
The findings suggest a detrimental role of PD-L1 on endothelial cells and a protective role on neutrophils in the context of sepsis.
Clinical Implications
The differential impact of PD-L1 expression on endothelial cells versus neutrophils suggests potential therapeutic targets for mitigating lung injury in sepsis. Clinicians should consider the role of immune checkpoint pathways in the management of sepsis-related lung complications.
Conclusion
This study underscores the complex role of PD-L1 in sepsis, indicating that targeting endothelial PD-L1 may offer a novel approach to reduce lung injury and improve survival in septic patients.
