Dietary strawberries increase the proliferative response of CD3/CD28-activated CD8+ T cells and the production of TNF-α in lipopolysaccharide-stimulated monocytes from obese human subjects

Susan J. Zunino, David H. Storms, Tammy L. Freytag, Bruce E. Mackey, Ling Zhao, Julia S. Gouffon, Daniel H. Hwang

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Obesity increases the risk of developing bacterial and viral infections compared with normal weight. In a 7-week double-blind, randomised, cross-over trial, twenty obese volunteers (BMI between 30 and 40 kg/m2) were fed freeze-dried strawberry powder or strawberry-flavoured placebo preparations to determine the effects of dietary strawberries on immune function. Blood was collected at six time points during the study and peripheral blood mononuclear cells (PBMC) were isolated at each time point and activated with CD3 plus CD28 antibodies (T-lymphocyte activation) or lipopolysaccharide (LPS, monocyte activation). Interferon-γ, TNF-α, IL-4 and IL-10 were measured in supernatants from the activated T cells. Supernatants from the activated monocytes were analysed for the production of TNF-α, IL-1β, IL-6 and IL-8. PBMC were pre-stained with PKH (Paul Karl Horan) dye and activated with CD3 plus CD28 antibodies to determine the proliferative responses of CD4 + and CD8+ T-lymphocytes by flow cytometry. To detect global changes in gene expression, microarray analysis was performed on LPS- and vehicle-treated PBMC from two subjects before and after the strawberry intervention. No difference was observed for the production of T-cell cytokines between the intervention groups. The production of TNF-α was increased in the supernatants from LPS-activated PBMC in the group consuming strawberries compared with the placebo. A modest increase in the proliferation of the CD8+ T-lymphocyte population was observed at 24 h post-activation. These data suggest that dietary strawberries may increase the immunological response of T-lymphocytes and monocytes in obese people who are at greater risk for developing infections.

Original languageEnglish (US)
Pages (from-to)2011-2019
Number of pages9
JournalBritish Journal of Nutrition
Volume110
Issue number11
DOIs
StatePublished - Dec 14 2013
Externally publishedYes

Keywords

  • Immunity
  • Lipopolysaccharide
  • Strawberries
  • T-cell proliferation
  • TNF-α

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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