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Characterising Cytokine Gene Expression Signatures in Patients with Severe Sepsis
Introduction. Severe sepsis in humans may be related to an underlying profound immune suppressive state. We investigated the link between gene expression of immune regulatory cytokines and the range of illness severity in patients with infection and severe sepsis. Methods. A prospective observational study included 54 ICU patients with severe sepsis, 53 patients with infection without organ failure, and 20 healthy controls. Gene expression in peripheral blood mononuclear cells (PBMC) was measured using realtime polymerase chain reaction. Results. Infection differed from health by decreased expression of the IL2, and IL23 and greater expression of IL10 and IL27. Severe sepsis differed from infection by having decreased IL7, IL23, IFN??, and TNF?? gene expression. An algorithm utilising mRNA copy number for TNF??, IFN??, IL7, IL10, and IL23 accurately distinguished sepsis from severe sepsis with a receiver operator characteristic value of 0.88. Gene expression was similar with gram-positive and gram-negative infection and was similar following medical and surgical severe sepsis. Severity of organ failure was associated with serum IL6 protein levels but not with any index of cytokine gene expression in PBMCs. Conclusions. Immune regulatory cytokine gene expression in PBMC provides a robust method of modelling patients' response to infection.
Keyword(s): Immunology; Immunology, Inflammation & Infection; International Development
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): Grealy, R, White, M, Stordeur, P, Kelleher, D, Doherty, DG, McManus, R, Ryan, T, Characterising Cytokine Gene Expression Signatures in Patients with Severe Sepsis, Mediators of Inflammation, 2013, 2013, 164246
First Indexed: 2014-10-17 05:38:05 Last Updated: 2020-10-30 08:16:31