RESEARCH ARTICLE Trait Hostility and Acute Inflammatory Responses to Stress in the Laboratory Dominique Girard1,2, Jean-Claude Tardif1,3, Julie Boisclair Demarble1,4, Bianca D’Antono1,4* 1 Research Center, Montreal Heart Institute, Montreal, Quebec, Canada, 2 Department of Psychology, Université du Québec à Montréal, Montreal, Quebec, Canada, 3 Department of Medicine, Université de Montréal, Montreal, Quebec, Canada, 4 Department of Psychology, Université de Montréal, Montreal, Quebec, Canada *
[email protected] a11111 Abstract Hostility has been associated with higher basal levels of inflammation. The present study evaluated the association of hostility with acute stress-induced changes in inflammatory activity. One hundred and ninety-nine healthy men and women, aged 19–64 years, were OPEN ACCESS exposed to a stress protocol involving four interpersonal stressors. Participants completed Citation: Girard D, Tardif J-C, Boisclair Demarble J, the Cook-Medley Hostility questionnaire and provided two blood samples for the measure- D’Antono B (2016) Trait Hostility and Acute ment of inflammatory biomarkers (CRP, Il-6, MPO, TNF-α, MCP-1, Il-8, Il-10, and Il-18), Inflammatory Responses to Stress in the Laboratory. prior to and following exposure to a standardized stress protocol. In univariate analyses, PLoS ONE 11(6): e0156329. doi:10.1371/journal. pone.0156329 hostility was associated with significantly higher TNF-α, but lower Il-8 and Il-18 values post- stress, though only Il-8 remained significant after controlling for baseline differences. In mul- Editor: Kottarappat N Dileepan, University of Kansas Medical Center, UNITED STATES tivariate analyses, a significant Age by Hostility interaction emerged for Il-6, while sex mod- erated the relation between hostility and Il-10 reactivity.