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Univ Louisville J Respir Infect. 2017;1(1):3-11. doi: 10.18297/jri/vol1/iss1/1/. Epub 2017 Jan 30.

Using cluster analysis of cytokines to identify patterns of inflammation in hospitalized patients with community-acquired pneumonia: a pilot study.

The University of Louisville journal of respiratory infections

Timothy L Wiemken, Robert R Kelley, Rafael Fernandez-Botran, William A Mattingly, Forest W Arnold, Stephen P Furmanek, Marcos I Restrepo, James D Chalmers, Paula Peyrani, Rodrigo Cavallazzi, Jose Bordon, Stefano Aliberti, Julio A Ramirez

Affiliations

  1. University of Louisville Division of Infectious Diseases, Louisville, Kentucky, USA.
  2. University of Louisville Department of Pathology and Laboratory Medicine, Louisville, Kentucky, USA.
  3. Department of Pulmonary Diseases, South Texas Veterans Health Care System and University of Texas at San Antonio, San Antonio, Texas, USA.
  4. Department of Respiratory Medicine, Ninewells Hospital and Medical School, Dundee, United Kingdom.
  5. University of Louisville Division of Pulmonary, Critical Care, and Sleep Disorders Medicine, Louisville, Kentucky USA.
  6. Providence Hospital Section of Infectious Diseases, Washington DC, USA.
  7. Department of Health Sciences, University of Milano - Bicocca, Respiratory Unit, AO San Gerardo, Monza, Italy.

PMID: 28393141 PMCID: PMC5382869 DOI: 10.18297/jri/vol1/iss1/1/

Abstract

INTRODUCTION: Patients with severe community-acquired pneumonia (CAP) are believed to have an exaggerated inflammatory response to bacterial infection. Therapies aiming to modulate the inflammatory response have been largely unsuccessful, perhaps reflecting that CAP is a heterogeneous disorder that cannot be modulated by a single anti-inflammatory approach. We hypothesize that the host inflammatory response to pneumonia may be characterized by distinct cytokine patterns, which can be harnessed for personalized therapies.

METHODS: Here, we use hierarchical cluster analysis of cytokines to examine if patterns of inflammatory response in 13 hospitalized patients with CAP can be defined. This was a secondary data analysis of the Community-Acquired Pneumonia Inflammatory Study Group (CAPISG) database. The following cytokines were measured in plasma and sputum on the day of admission: interleukin (IL)-1β, IL-1 receptor antagonist (IL-1ra), IL-6, CXCL8 (IL-8), IL-10, IL-12p40, IL-17, interferon (IFN)

RESULTS: A total of thirteen patients were included in this pilot study. Cluster analysis identified distinct inflammatory response patterns of cytokines in the plasma, sputum, and the ratio of plasma to sputum.

CONCLUSIONS: Inflammatory response patterns in plasma and sputum can be identified in hospitalized patients with CAP. Characterization of the local and systemic inflammatory response may help to better discriminate patients for enrollment into clinical trials of immunomodulatory therapies.

Keywords: Cytokines; immunomodulation; inflammatory response; outcomes; pneumonia; steroids

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