Pneumonia in the first week after polytrauma is associated with reduced blood levels of soluble herpes virus entry mediator
Background Pneumonia develops frequently after major surgery and polytrauma and thus in the presence of systemic inflammatory response syndrome (SIRS) and organ dysfunction. Immune checkpoints balance self-tolerance and immune activation. Altered checkpoint blood levels were reported for sepsis. We...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 December 2023
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| In: |
Frontiers in immunology
Year: 2023, Volume: 14, Pages: 1-18 |
| ISSN: | 1664-3224 |
| DOI: | 10.3389/fimmu.2023.1259423 |
| Online Access: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.3389/fimmu.2023.1259423 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2023.1259423 
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| Author Notes: | Noah Schaefer, Holger A. Lindner, Bianka Hahn, Roman Schefzik, Sonia Y. Velásquez, Jutta Schulte, Tanja Fuderer, Franz-Simon Centner, Jochen J. Schoettler, Bianca S. Himmelhan, Timo Sturm, Manfred Thiel, Verena Schneider-Lindner, Anna Coulibaly |
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| 245 | 1 | 0 | |a Pneumonia in the first week after polytrauma is associated with reduced blood levels of soluble herpes virus entry mediator |c Noah Schaefer, Holger A. Lindner, Bianka Hahn, Roman Schefzik, Sonia Y. Velásquez, Jutta Schulte, Tanja Fuderer, Franz-Simon Centner, Jochen J. Schoettler, Bianca S. Himmelhan, Timo Sturm, Manfred Thiel, Verena Schneider-Lindner, Anna Coulibaly |
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| 520 | |a Background Pneumonia develops frequently after major surgery and polytrauma and thus in the presence of systemic inflammatory response syndrome (SIRS) and organ dysfunction. Immune checkpoints balance self-tolerance and immune activation. Altered checkpoint blood levels were reported for sepsis. We analyzed associations of pneumonia incidence in the presence of SIRS during the first week of critical illness and trends in checkpoint blood levels.Materials and methodsPatients were studied from day two to six after admission to a surgical intensive care unit (ICU). Blood was sampled and physician experts retrospectively adjudicated upon the presence of SIRS and Sepsis-1/2 every eight hours. We measured the daily levels of immune checkpoints and inflammatory markers by bead arrays for polytrauma patients developing pneumonia. Immune checkpoint time series were additionally determined for clinically highly similar polytrauma controls remaining infection-free during follow-up. We performed cluster analyses. Immune checkpoint time trends in cases and controls were compared with hierarchical linear models. For patients with surgical trauma and with and without sepsis, selected immune checkpoints were determined in study baseline samples.ResultsIn polytrauma patients with post-injury pneumonia, eleven immune checkpoints dominated subcluster 3 that separated subclusters 1 and 2 of myeloid markers from subcluster 4 of endothelial activation, tissue inflammation, and adaptive immunity markers. Immune checkpoint blood levels were more stable in polytrauma cases than controls, where they trended towards an increase in subcluster A and a decrease in subcluster B. Herpes virus entry mediator (HVEM) levels (subcluster A) were lower in cases throughout. In unselected surgical patients, sepsis was not associated with altered HVEM levels at the study baseline.ConclusionPneumonia development after polytrauma until ICU-day six was associated with decreased blood levels of HVEM. HVEM signaling may reduce pneumonia risk by strengthening myeloid antimicrobial defense and dampening lymphoid-mediated tissue damage. Future investigations into the role of HVEM in pneumonia and sepsis development and as a predictive biomarker should consider the etiology of critical illness and the site of infection. | ||
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