Unknown,Transcriptomics,Genomics,Proteomics

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Genome-wide gene expression analysis during endotoxin tolerance in PBMCs.

ABSTRACT: Genome-wide gene expression was measured in peripheral blood mononuclear cells (PBMC) from healthy humans donors, four hours post stimulation of a single or double treatment of LPS and compared to untreated control PBMCs. We show that a second treatment with LPS induces endotoxin tolerance, with a transcription profile similar to that seen during alternative polarization (M2) of mononuclear cells. Microarray processing was performed by the Genome BC Microarray Platform. Total RNA obtained from PBMCs from blood from healthy humans after single treatment with LPS, two treatments with LPS, or untreated. Comparison of LPS or LPS/LPS to untreated cells shows the gene expression pattern of endotoxin tolerance.

ORGANISM(S): Homo sapiens

SUBMITTER: Christopher Fjell

PROVIDER: E-GEOD-22248 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Background: Sepsis involves aberrant immune responses to infection, but the exact nature of this immune dysfunction remains poorly defined. Bacterial endotoxins like lipopolysaccharide (LPS) are potent inducers of inflammation, which has been associated with the pathophysiology of sepsis, but repeated exposure can also induce a suppressive effect known as endotoxin tolerance or cellular reprogramming. It has been proposed that endotoxin tolerance might be associated with the immunosuppressive state that was primarily observed during late-stage sepsis. However, this relationship remains poorly characterised. Here we clarify the underlying mechanisms and timing of immune dysfunction in sepsis. Methods: We defined a gene expression signature characteristic of endotoxin tolerance. Gene-set test approaches were used to correlate this signature with early sepsis, both newly and retrospectively analysing microarrays from 593 patients in 11 cohorts. Then we recruited a unique cohort of possible sepsis patients at first clinical presentation in an independent blinded controlled observational study to determine whether this signature was associated with the development of confirmed sepsis and organ dysfunction. Findings: All sepsis patients presented an expression profile strongly associated with the endotoxin tolerance signature (p < 0.01; AUC 96.1%). Importantly, this signature further differentiated between suspected sepsis patients who did, or did not, go on to develop confirmed sepsis, and predicted the development of organ dysfunction. Interpretation: Our data support an updated model of sepsis pathogenesis in which endotoxin tolerance-mediated immune dysfunction (cellular reprogramming) is present throughout the clinical course of disease and related to disease severity. Thus endotoxin tolerance might offer new insights guiding the development of new therapies and diagnostics for early sepsis. For the RNA-Seq study reported here, 73 patients were recruited with deferred consent at the time of first examination in an emergency ward based on the opinion of physicians that there was a potential for the patient's condition to develop into sepsis. These were retrospectively divided into groups based on clinical features and compared to 11 non-urgent surgical controls.

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Genome-wide gene expression analysis during endotoxin tolerance in PBMCs.

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