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Blockade of VEGFR-1, but not VEGFR-2 with neutralizing Abs completely abolished the suppressive effect of PlGF. Furthermore, we found that treatment with PlGF up-regulated IL-10 production in CD4+ and CD8+ T cells, promoted CD8+ T cells apoptosis and enhanced the expression of inhibitory receptors (PD-1 and TIM-3) on activated T cells. Our in vitro findings suggest the involvement of PlGF/VEGFR-1 signaling in the modulation of T cell responses in a-CD3-stimulated PBMCs. ©2020 Society for Leukocyte Biology.BACKGROUND The fluorescence sen