IL-6 neutralization decreases T cell proliferation and cytokine production upon restimulation by allogeneic HUVEC. CIITA transduced HUVECs were cocultured.

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IL-6 neutralization decreases T cell proliferation and cytokine production upon restimulation by allogeneic HUVEC. CIITA transduced HUVECs were cocultured with CD4+ memory T cells for 3 d in presence of either control IgG or an anti–IL-6 neutralizing mAb (30 μg/ml). IL-6 neutralization decreases T cell proliferation and cytokine production upon restimulation by allogeneic HUVEC. CIITA transduced HUVECs were cocultured with CD4+ memory T cells for 3 d in presence of either control IgG or an anti–IL-6 neutralizing mAb (30 μg/ml). CD4+ memory T cells were then rested for 3 d and restimulated with allogeneic CIITA-transduced HUVECs from the same donor as in the primary culture. A, ELISA analyses of media collected from cocultures 24 h after restimulation (n = 12 from three independent experiments, *p < 0.05). B, CD4+ memory T cells were labeled with CFSE after rest, and proliferation was assessed 4 d after restimulation with allogeneic ECs via CFSE dilution. Shown are representative FACS blots from one experiment (left) and quantitative data pooled from three independent experiments (right). Paired t test analysis was performed to assess statistical significance: *p < 0.05. C, Cells were treated as in B, but proliferation was compared between complete population of CD4+ memory T cells and CD161+ T cell-depleted CD4+ memory T cells. Statistical significance was assessed by two-way ANOVA followed by Bonferroni post hoc test: *p < 0.05. Birgit Fogal et al. J Immunol 2011;187:6268-6280 Copyright © 2011 by The American Association of Immunologists, Inc.