Immunotherapy

Cancer immunotherapy

Biology

Cytotoxic T cell

In vitro

Immunology

Immunity

Lymphocytic choriomeningitis

Immune checkpoint

Cancer research

Genetics

Biochemistry

clone (Java method)

Immune system

Nature Immunology

CD8+ T cell exhaustion is a state of dysfunction acquired in chronic viral infection and cancer, characterized by the formation of Slamf6+ progenitor exhausted and Tim-3+ terminally exhausted subpopulations through unknown mechanisms. Here we establish the phosphatase PTPN2 as a new regulator of the differentiation of the terminally exhausted subpopulation that functions by attenuating type 1 interferon signaling. Deletion of Ptpn2 in CD8+ T cells increased the generation, proliferative capacity and cytotoxicity of Tim-3+ cells without altering Slamf6+ numbers during lymphocytic choriomeningitis virus clone 13 infection. Likewise, Ptpn2 deletion in CD8+ T cells enhanced Tim-3+ anti-tumor responses and improved tumor control. Deletion of Ptpn2 throughout the immune system resulted in MC38 tumor clearance and improved programmed cell death-1 checkpoint blockade responses to B16 tumors. Our results indicate that increasing the number of cytotoxic Tim-3+CD8+ T cells can promote effective anti-tumor immunity and implicate PTPN2 in immune cells as an attractive cancer immunotherapy target. Exhaustion is an acquired state of T cell dysfunction. Sharpe and colleagues demonstrate that the phosphatase PTPN2 supports a T cell-intrinsic exhaustion program in both chronic infection and cancer models.

PTPN2 regulates the generation of exhausted CD8+ T cell subpopulations and restrains tumor immunity