09Feb 2023
Release of extracellular superoxide dismutase into alveolar fluid protects against acute lung injury and inflammation in Staphylococcus aureus pneumonia

Release of extracellular superoxide dismutase into alveolar fluid protects against acute lung injury and inflammation in Staphylococcus aureus pneumonia

This study hypothesized that R213G EC-SOD variant protects against lung injury and inflammation via the blockade of neutrophil-recruitment in the infectious model of methicillin-resistant S. aureus (MRSA) pneumonia. The study results showed that MRSA-infected mice expressing the R213G EC-SOD variant also had attenuated neutrophil numbers in BALF and decreased expression of neutrophil chemoattractant CXCL1 by the alveolar epithelial ATII cells, compared to the infected WT group. The decreased neutrophil numbers in R213G mice were not due to the increased rate of apoptosis. Mice expressing R213G variant had a differential effect on neutrophil functionality - the generation of neutrophil extracellular traps (NETs) but not myeloperoxidase (MPO) levels were attenuated in comparison to WT controls. Despite having the same bacterial load in the lung as WT controls, mice expressing R213G EC-SOD variant were protected from extrapulmonary dissemination of bacteria.

  • #pulmonology

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