Proteomic discovery and verification of serum amyloid A as a predictor marker of patients at risk of post-stroke infection : a pilot study
Azurmendi, Leire
Lapierre-Fetaud, V.
Schneider, J.
Montaner, J. (Universitat Autònoma de Barcelona. Departament de Medicina)
Katan, M.
Sanchez, Jean-Charles

Fecha:	2017
Resumen:	Post-stroke infections occur in 20-36% of stroke patients and are associated with high morbidity and mortality rates. Early identification of patients at risk of developing an infection could improve care via an earlier treatment leading to a better outcome. We used proteomic tools in order to discover biomarkers able to stratify patients at risk of post-stroke infection. The post hoc analysis of a prospective cohort study including 40 ischemic stroke patients included 21 infected and 19 non-infected participants. A quantitative, isobaric labeling, proteomic strategy was applied to the plasma samples of 5 infected and 5 non-infected patients in order to highlight any significantly modulated proteins. A parallel reaction monitoring (PRM) assay was applied to 20 additional patients (10 infected and 10 non-infected) to verify discovery results. The most promising protein was pre-validated using an ELISA immunoassay on 40 patients and at different time points after stroke onset. Tandem mass analysis identified 266 proteins, of which only serum amyloid A (SAA1/2) was significantly (p = 0. 007) regulated between the two groups of patients. This acute-phase protein appeared to be 2. 2 times more abundant in infected patients than in non-infected ones. These results were verified and validated using PRM and ELISA immunoassays, which showed that infected patients had significantly higher concentrations of SAA1/2 than non-infected patients at hospital admission, but also at 1, 3, and 5 days after admission. The present study demonstrated that SAA1/2 is a promising predictor, at hospital admission, of stroke patients at risk of developing an infection. Further large, multicenter validation studies are needed to confirm these results. If confirmed, SAA1/2 concentrations could be used to identify the patients most at risk of post-stroke infections and therefore implement treatments more rapidly, thus reducing mortality. The online version of this article (doi:10. 1186/s12014-017-9162-0) contains supplementary material, which is available to authorized users.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Clinical Proteomics, Vol. 14 (july 2017) , ISSN 1559-0275

DOI: 10.1186/s12014-017-9162-0
PMID: 28701906

10 p, 1.3 MB

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