ICOS-LICOS interaction is critically involved in TGN1412-mediated T-cell activation.

Blood
Sabrina WeissmüllerZoe Waibler

Abstract

TGN1412, a superagonistic CD28-specific antibody, was shown to require Fc-cross-linking or immobilization as a prerequisite to mediate T-cell proliferation and cytokine release in vitro. We used primary human umbilical vein endothelial cells (HUVECs) to study their ability to induce activation of TGN1412-treated T cells. We confirmed that peripheral primary human T cells do not show activation upon stimulation with soluble TGN1412 alone. Nevertheless, cocultivation of TGN1412-treated T cells with HUVECs induced T-cell activation that was further enhanced using cytokine prestimulated HUVECs. Unexpectedly, Fc-FcγR interaction was dispensable for endothelial cell-mediated proliferation of TGN1412-treated T cells. Transwell-culture assays showed that TGN1412-treated T cells need direct cell-to-cell contact to HUVECs to induce proliferation. We found that costimulatory ICOS-LICOS interaction between T cells and endothelial cells is critically involved in TGN1412-mediated effects. Blocking LICOS reduced TGN1412-mediated T-cell proliferation significantly, whereas recombinant LICOS fully conferred TGN1412-mediated T-cell proliferation. Of note, cytokine stimulation enhanced LICOS expression on HUVECs and ICOS-LICOS interaction up-regu...Continue Reading

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