Shp-2 Is Dispensable for Establishing T Cell Exhaustion and for PD-1 Signaling In Vivo

Publication date: 3 April 2018
Source:Cell Reports, Volume 23, Issue 1
Author(s): Giorgia Rota, Charlène Niogret, Anh Thu Dang, Cristina Ramon Barros, Nicolas Pierre Fonta, Francesca Alfei, Leonor Morgado, Dietmar Zehn, Walter Birchmeier, Eric Vivier, Greta Guarda
In chronic infection and cancer, T cells acquire a dysfunctional state characterized by the expression of inhibitory receptors. In vitro studies implicated the phosphatase Shp-2 downstream of these receptors, including PD-1. However, whether Shp-2 is responsible in vivo for such dysfunctional responses remains elusive. To address this, we generated T cell-specific Shp-2-deficient mice. These mice did not show differences in controlling chronic viral infections. In this context, Shp-2-deleted CD8⁺ T lymphocytes expanded moderately better but were less polyfunctional than control cells. Mice with Shp-2-deficient T cells also showed no significant improvement in controlling immunogenic tumors and responded similarly to controls to α-PD-1 treatment. We therefore showed that Shp-2 is dispensable in T cells for globally establishing exhaustion and for PD-1 signaling in vivo. These results reveal the existence of redundant mechanisms downstream of inhibitory receptors and represent the foundation for defining these relevant molecular events.

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Teaser

In vitro data indicate that Shp-2 is engaged by PD-1 and contributes to T cell exhaustion. Rota et al. show that Shp-2-deficient T cells acquire a dysfunctional state when exposed to chronic antigen in vivo and respond to PD-1 blockade, indicating the existence of additional signaling factors.


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