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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Patterns of Gene Expression in Peripheral Blood Mononuclear Cells and Outcomes from Patients with Sepsis Secondary to Community Acquired Pneumonia

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Author(s):
Severino, Patricia [1] ; Silva, Eliezer [2] ; Baggio-Zappia, Giovana Lotici [3] ; Colo Brunialti, Milena Karina [3] ; Nucci, Laura Alejandra [3] ; Rigato, Jr., Otelo [4] ; Cotrim Guerreiro da Silva, Ismael Dale [5] ; Machado, Flavia Ribeiro [6] ; Salomao, Reinaldo [3]
Total Authors: 9
Affiliation:
[1] Hosp Israelita Albert Einstein, Inst Israelita Ensino & Pesquisa, Ctr Expt Res, Sao Paulo - Brazil
[2] Hosp Israelita Albert Einstein, Intens Care Unit, Sao Paulo - Brazil
[3] Univ Fed Sao Paulo Unifesp, EPM, Hosp Sao Paulo, Div Infect Dis, Sao Paulo - Brazil
[4] Hosp Sirio Libanes, Intens Care Unit, Sao Paulo - Brazil
[5] Univ Fed Sao Paulo Unifesp, EPM, Dept Gynecol, Sao Paulo - Brazil
[6] Univ Fed Sao Paulo Unifesp, Intens Care Unit, Hosp Sao Paulo, Sao Paulo - Brazil
Total Affiliations: 6
Document type: Journal article
Source: PLoS One; v. 9, n. 3 MAR 25 2014.
Web of Science Citations: 18
Abstract

Mechanisms governing the inflammatory response during sepsis have been shown to be complex, involving cross-talk between diverse signaling pathways. Current knowledge regarding the mechanisms underlying sepsis provides an incomplete picture of the syndrome, justifying additional efforts to understand this condition. Microarray-based expression profiling is a powerful approach for the investigation of complex clinical conditions such as sepsis. In this study, we investigate whole-genome expression profiles in mononuclear cells from survivors (n = 5) and non-survivors (n = 5) of sepsis. To circumvent the heterogeneity of septic patients, only patients admitted with sepsis caused by community-acquired pneumonia were included. Blood samples were collected at the time of sepsis diagnosis and seven days later to evaluate the role of biological processes or genes possibly involved in patient recovery. Principal Components Analysis (PCA) profiling discriminated between patients with early sepsis and healthy individuals. Genes with differential expression were grouped according to Gene Ontology, and most genes related to immune defense were up-regulated in septic patients. Additionally, PCA in the early stage was able to distinguish survivors from non-survivors. Differences in oxidative phosphorylation seem to be associated with clinical outcome because significant differences in the expression profile of genes related to mitochondrial electron transport chain (ETC) I-V were observed between survivors and non-survivors at the time of patient enrollment. Global gene expression profiles after seven days of sepsis progression seem to reproduce, to a certain extent, patterns collected at the time of diagnosis. Gene expression profiles comparing admission and follow-up samples differed between survivors and non-survivors, with decreased expression of genes related to immune functions in non-survivors. In conclusion, genes related to host defense and inflammatory response ontology were up-regulated during sepsis, consistent with the need for a host response to infection, and the sustainability of their expression in follow-up samples was associated with outcomes. (AU)

FAPESP's process: 06/58744-1 - Sepsis: integrating basic research and clinical investigation
Grantee:Reinaldo Salomão
Support Opportunities: Research Projects - Thematic Grants