Blocking immunosuppression by human Tregs in vivo with antibodies targeting integrin αVβ8.
(2017) Proceedings of the National academy of sciences of the United States of America — Vol. 114, n° 47, p. E10161-E10168 (2017)
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- Human regulatory T cells (Tregs) suppress other T cells by converting the latent, inactive form of TGF-β1 into active TGF-β1. In Tregs, TGF-β1 activation requires GARP, a transmembrane protein that binds and presents latent TGF-β1 on the surface of Tregs stimulated through their T cell receptor. However, GARP is not sufficient because transduction of GARP in non-Treg T cells does not induce active TGF-β1 production. RGD-binding integrins were shown to activate TGF-β1 in several non-T cell types. Here we show that αVβ8 dimers are present on stimulated human Tregs but not in other T cells, and that antibodies against αV or β8 subunits block TGF-β1 activation in vitro. We also show that αV and β8 interact with GARP/latent TGF-β1 complexes in human Tregs. Finally, a blocking antibody against β8 inhibited immunosuppression by human Tregs in a model of xenogeneic graft-vs.-host disease induced by the transfer of human T cells in immunodeficient mice. These results show that TGF-β1 activation on the surface of human Tregs implies an interaction between the integrin αVβ8 and GARP/latent TGF-β1 complexes. Immunosuppression by human Tregs can be inhibited by antibodies against GARP or against the integrin β8 subunit. Such antibodies may prove beneficial against cancer or chronic infections.
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Stockis, J., Liénart, S., Colau, D., Collignon, A., Nishimura, S. L., Sheppard, D., Coulie, P., & Lucas, S. (2017). Blocking immunosuppression by human Tregs in vivo with antibodies targeting integrin αVβ8. Proceedings of the National academy of sciences of the United States of America, 114(47), E10161-E10168. https://doi.org/10.1073/pnas.1710680114 (Original work published 2017)