Proteomic Pathway Analysis of Monocyte-Derived Exosomes during Surgical Sepsis Identifies Immunoregulatory Functions
Autor: | Adara R. McCarty, Kanhaiya Singh, John W. Christman, Chandan K. Sen, Ahmed S. Abouhashem, Jon Wisler |
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Rok vydání: | 2020 |
Předmět: |
Lipopolysaccharides
Proteomics Microbiology (medical) Lipopolysaccharide Surgical Infection Society Articles Down-Regulation Exosomes Models Biological Monocytes Sepsis 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Immune system medicine Humans 030212 general & internal medicine Immunosuppression Therapy Inflammation 0303 health sciences Tumor Necrosis Factor-alpha 030306 microbiology business.industry Monocyte medicine.disease Microvesicles Up-Regulation Infectious Diseases medicine.anatomical_structure chemistry Proteome Immunology Surgery Tumor necrosis factor alpha business |
Zdroj: | Surg Infect (Larchmt) |
ISSN: | 1557-8674 1096-2964 |
Popis: | Background: Patients with sepsis exhibit significant long-term immunosuppressive sequelae. Monocyte dysfunction is a hallmark of this damage. Circulating exosomes are an important mediator of the systemic signaling events that occur during the septic response; thus, we sought to characterize the contribution of circulating exosomes to the inflammatory process induced during sepsis Methods: Monocyte-derived exosomes were isolated from cultured monocytes from healthy adult donors via stimulation with lipopolysaccharide (LPS) or phosphate-buffered saline (PBS). The proteome was determined by capillary-liquid chromatography–nanospray tandem mass spectrometry (capillary–LC/NT/MS). Using pathway analysis, proteomic networks of exosomes derived from LPS-stimulated monocytes were compared with those isolated from patients with surgical sepsis. Naïve monocytes were then treated with these exosomes and stimulated with LPS to determine the effects on recipient-cell immune function. Results: Proteomic analysis demonstrated 18 differentially expressed proteins (17 down-regulated, one up-regulated) in sepsis-derived exosomes, with 15 differentially expressed proteins (14 down-regulated, one up-regulated) in the LPS-stimulated exosomes. Functional enrichment analysis demonstrated several down-regulated processes, including localization, biogenesis, and metabolic and cellular processes in addition to immune system processes. In LPS-stimulated macrophages, similar down-regulated processes were seen, including metabolic and cellular processes, as well as the response to stimulus. Cells treated with sepsis-derived exosomes or exosomes from LPS-stimulated monocytes demonstrated significant reductions in tumor necrosis factor (TNF)-α generation in response to LPS stimulation. Conclusions: Proteomic analysis of sepsis-derived exosomes and LPS-stimulated, macrophage-derived exosomes exhibited down-regulation of several important protein networks, including the immune response. In addition, human monocytes treated with exosomes from patients with sepsis or LPS-stimulated monocytes demonstrated significant reductions in TNF-α generation in response to LPS stimulation. These data suggest the contribution of circulating exosomes to systemic signaling and immunomodulation during sepsis. |
Databáze: | OpenAIRE |
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