Treg phenotype in UM and SM.

<p>PBMC of 3 AC, 6 UM, and 5 SM patients were stained for CD4, CD25, Foxp3, and CD127, or CD45RO, CD69, CCR7, or TNFRII. (A) Mean fluorescent intensities (MFI) are shown for CD4⁺CD25⁻Foxp3⁻ (solid line) and CD4⁺CD25⁺Foxp3⁺ (dark grey) cells or CD4⁺Foxp3⁺CD127^lo (light grey) cells. Dotted lines represent the isotype controls. One representative donor is shown, and activated T cells with high expression of CD4 were gated out. (B) Pooled TNFRII MFI (3 AC, 6 UM, 5 SM). Horizontal lines show the median (p = 0.005 by Kruskal-Wallis test, and in post-hoc pairwise comparison of UM and SM: p = 0.008, and between SM and AC: p = 0.04). (C) Foxp3 expression is shown for TNFRII positive Treg cells (top panel) and TNFRII negative Treg cells (bottom panel) for one representative UM and one representative SM sample. The dotted line shows isotype control staining. AC, malaria-exposed asymptomatic controls; UM, uncomplicated <i>P. falciparum</i> malaria; SM, severe <i>P. falciparum</i> malaria.