1. Granulocytic myeloid-derived suppressor cell activity during biofilm infection is regulated by a glycolysis/ HIF1a axis
- Author
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Horn, Christopher M., Arumugam, Prabhakar, Van Roy, Zachary, Heim, Cortney E., Fallet, Rachel W., Bertrand, Blake P., Shinde, Dhananjay, Thomas, Vinai C., Romanova, Svetlana G., Bronich, Tatiana K., Hartman, Curtis W., Garvin, Kevin L., and Kielian, Tammy
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Staphylococcus aureus -- Health aspects -- Physiological aspects ,RNA sequencing -- Health aspects -- Physiological aspects ,Genes -- Physiological aspects -- Health aspects ,Immunotherapy -- Physiological aspects -- Health aspects ,Infection -- Health aspects -- Physiological aspects ,Staphylococcus aureus infections -- Physiological aspects -- Health aspects ,Health care industry - Abstract
Staphylococcus aureus is a leading cause of biofilm-associated prosthetic joint infection (PJI). A primary contributor to infection chronicity is an expansion of granulocytic myeloid-derived suppressor cells (G-MDSCs), which are critical for orchestrating the antiinflammatory biofilm milieu. Single-cell sequencing and bioinformatic metabolic algorithms were used to explore the link between G-MDSC metabolism and S. aureus PJI outcome. Glycolysis and the hypoxia response through HIF1a were significantly enriched in G-MDSCs. Interfering with both pathways in vivo, using a 2- deoxyglucose nanopreparation and granulocyte-targeted Hif1a conditional KO mice, respectively, attenuated G-MDSC-mediated immunosuppression and reduced bacterial burden in a mouse model of S. aureus PJI. In addition, single-cell RNA-Seq (scRNA-Seq) analysis of granulocytes from PJI patients also showed an enrichment in glycolysis and hypoxia- response genes. These findings support the importance of a glycolysis/HIF1a axis in promoting G-MDSC antiinflammatory activity and biofilm persistence during PJI., Introduction Staphylococcus aureus is a leading cause of healthcare-and community-associated infections (1). This is due, in part, to numerous virulence factors that allow the bacterium to adapt and thrive in [...]
- Published
- 2024
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